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PCF8578
LCD row/column driver for dot matrix graphic displays
Rev. 06 -- 5 May 2009 Product data sheet
1. General description
The PCF8578 is a low power CMOS1 LCD row and column driver, designed to drive dot matrix graphic displays at multiplex rates of 1:8, 1:16, 1:24 or 1:32. The device has 40 outputs, of which 24 are programmable and configurable for the following ratios of rows/columns: 328, 2416, 1624 or 832. The PCF8578 can function as a stand-alone LCD controller and driver for use in small systems. For larger systems it can be used in conjunction with up to 32 PCF8579s for which it has been optimized. Together these two devices form a general purpose LCD dot matrix driver chip set, capable of driving displays of up to 40960 dots. The PCF8578 is compatible with most microcontrollers and communicates via a two-line bidirectional bus (I2C-bus). Communication overhead is minimized by a display RAM with auto-incremented addressing and display bank switching.
2. Features
I I I I I I I I I I I I I I I I I I Single chip LCD controller and driver Stand-alone or may be used with up to 32 PCF8579s (40960 dots possible) 40 driver outputs, configurable for several ratios of rows/columns: 328, 2416, 1624 or 832 Selectable multiplex rates: 1:8, 1:16, 1:24 or 1:32 Externally selectable bias configuration, 5 or 6 levels 1280-bit RAM for display data storage and scratch pad Display memory bank switching Auto-incremented data loading across hardware subaddress boundaries (with PCF8579) Provides display synchronization for PCF8579 On-chip oscillator, requires only 1 external resistor Power-On Reset (POR) blanks display Logic voltage supply range 2.5 V to 6 V Maximum LCD supply voltage 9 V Low power consumption I2C-bus interface Compatible with most microcontrollers Optimized pinning for single plane wiring in multiple device applications (with PCF8579) Space saving 56-lead small outline package and 64 pin quad flat pack
1.
The definition of the abbreviations and acronyms used in this data sheet can be found in Section 15.
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
3. Applications
I I I I I Automotive information systems Telecommunication systems Point-of-sale terminals Industrial computer terminals Instrumentation
4. Ordering information
Table 1. Ordering information Package Name PCF8578T/1 PCF8578H/1 PCF8578HT/1
[1]
Type number
Description plastic very small outline package; 56 leads plastic low profile quad flat package; 64 leads; body 10 x 10 x 1.4 mm[1] plastic thin quad flat package; 64 leads; body 10 x 10 x 1.0 mm
Version SOT190-1 SOT314-2 SOT357-1
VSO56 LQFP64 TQFP64
Should not be used for new designs.
5. Marking
Table 2. Marking codes Marking code PCF8578T PCF8578H PCF8578HT Type number PCF8578T/1 PCF8578H/1 PCF8578HT/1
PCF8578_6
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Product data sheet
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PCF8578
LCD row/column driver for dot matrix graphic displays
6. Block diagram
C39 - C32 R31/C31 - R8/C8 R7 - R0
VDD V2 V3 V4 V5 VLCD TEST DISPLAY MODE CONTROLLER OUTPUT CONTROLLER ROW/COLUMN(1) DRIVERS
PCF8578
Y DECODER AND SENSING AMPLIFIERS
32 x 40-BIT DISPLAY RAM
DISPLAY DECODER
X DECODER
POWER-ON RESET
SUBADDRESS COUNTER
RAM DATA POINTER Y X
TIMING GENERATOR
SYNC CLK
SCL SDA
INPUT FILTERS
I2C-BUS CONTROLLER
COMMAND DECODER
OSC OSCILLATOR
Rext(OSC)
VSS
msa842
n.c.
n.c.
SA0
(1) Operates at LCD voltage levels, all other blocks operate at logic levels.
Fig 1.
Block diagram
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PCF8578
LCD row/column driver for dot matrix graphic displays
7. Pinning information
7.1 Pinning
SDA SCL SYNC CLK VSS TEST SA0 OSC VDD
1 2 3 4 5 6 7 8 9
56 R0 55 R1 54 R2 53 R3 52 R4 51 R5 50 R6 49 R7 48 R8/C8 47 R9/C9 46 R10/C10 45 R11/C11 44 R12/C12 43 R13/C13 42 R14/C14 41 R15/C15 40 R16/C16 39 R17/C17 38 R18/C18 37 R19/C19 36 R20/C20 35 R21/C21 34 R22/C22 33 R23/C23 32 R24/C24 31 R25/C25 30 R26/C26 29 R27/C27
001aaj842
V2 10 V3 11 V4 12 V5 13 VLCD 14 n.c. 15 n.c. 16 C39 17 C38 18 C37 19 C36 20 C35 21 C34 22 C33 23 C32 24 R31/C31 25 R30/C30 26 R29/C29 27 R28/C28 28
PCF8578T
Top view. For mechanical details, see Figure 29.
Fig 2.
Pinning diagram of PCF8578T/1 (VSO56)
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PCF8578
LCD row/column driver for dot matrix graphic displays
60 R10/C10
59 R11/C11
58 R12/C12
57 R13/C13
56 R14/C14
55 R15/C15
54 R16/C16
53 R17/C17
52 R18/C18
51 R19/C19
50 R20/C20
R5 R4 R3 R2 R1 R0 SDA SCL SYNC
1 2 3 4 5 6 7 8 9
49 R21/C21
61 R9/C9
62 R8/C8
64 R6
63 R7
48 R22/C22 47 n.c. 46 R23/C23 45 R24/C24 44 R25/C25 43 R26/C26 42 R27/C27 41 R28/C28 40 R29/C29 39 R30/C30 38 R31/C31 37 C32 36 n.c. 35 C33 34 C34 33 C35
PCF8578H
CLK 10 VSS 11 TEST 12 SA0 13 n.c. 14 n.c. 15 OSC 16
n.c. 17
n.c. 18
n.c. 19
VDD 20
V2 21
V3 22
V4 23
V5 24
VLCD 25
n.c. 26
n.c. 27
n.c. 28
C39 29
C38 30
C37 31
C36 32
001aaj840
Top view. For mechanical details, see Figure 30.
Fig 3.
Pinning diagram of PCF8578H/1 (LQFP64)
PCF8578_6
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Product data sheet
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PCF8578
LCD row/column driver for dot matrix graphic displays
60 R10/C10
59 R11/C11
58 R12/C12
57 R13/C13
56 R14/C14
55 R15/C15
54 R16/C16
53 R17/C17
52 R18/C18
51 R19/C19
50 R20/C20
R5 R4 R3 R2 R1 R0 SDA SCL SYNC
1 2 3 4 5 6 7 8 9
49 R21/C21
61 R9/C9
62 R8/C8
64 R6
63 R7
48 R22/C22 47 n.c. 46 R23/C23 45 R24/C24 44 R25/C25 43 R26/C26 42 R27/C27 41 R28/C28 40 R29/C29 39 R30/C30 38 R31/C31 37 C32 36 n.c. 35 C33 34 C34 33 C35
PCF8576HT
CLK 10 VSS 11 TEST 12 SA0 13 n.c. 14 n.c. 15 OSC 16
n.c. 17
n.c. 18
n.c. 19
VDD 20
V2 21
V3 22
V4 23
V5 24
VLCD 25
n.c. 26
n.c. 27
n.c. 28
C39 29
C38 30
C37 31
C36 32
001aaj911
Top view. For mechanical details, see Figure 31.
Fig 4.
Pinning diagram of PCF8578HT/1 (TQFP64)
PCF8578_6
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Product data sheet
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NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
7.2 Pin description
Table 3. Symbol Pin description Pin VSO56 SDA SCL SYNC CLK VSS TEST[1] SA0 OSC VDD V2 to V5 VLCD n.c. 1 2 3 4 5 6 7 8 9 10 to 13 14 15, 16 LQFP64, TQFP64 7 8 9 10 11 12 13 16 20 21 to 24 25 14, 15, 17 to 19, 26 to 28, 36, 47 29 to 35, 37 38 to 46, 48 to 62 63, 64, 1 to 6 I2C-bus serial data input/output I2C-bus serial clock input cascade synchronization output external clock input/output ground test pin I2C-bus slave address input (bit 0) oscillator input supply voltage LCD bias voltage inputs LCD supply voltage not connected Description
C39 to C32 R31/C31 to R8/C8 R7 to R0
[1]
17 to 24 25 to 48 49 to 56
LCD column driver outputs LCD row and column driver outputs LCD row driver outputs
The TEST pin must be connected to VSS.
PCF8578_6
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Product data sheet
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PCF8578
LCD row/column driver for dot matrix graphic displays
8. Functional description
8.1 Display configurations
The PCF8578 row and column driver is designed for use in one of three ways:
* Stand-alone row and column driver for small displays (mixed mode) * Row and column driver with cascaded PCF8579s (mixed mode) * Row driver with cascaded PCF8579s (mixed mode and row mode)
Table 4. Applicatio n Possible display configurations Multiplex rate Mixed mode Rows 8 16 24 32 8[1] 16[1] 24[1] 32[1] 1:16 1:24 1:32 with PCF8579 1:8 1:16 1:24 1:32
[1] [2] Using 15 PCF8579s. Using 16 PCF8579s.
Row mode Columns 4[2] 640[2] 640[2] 640[2] 8x
Typical applications small digital or alphanumeric displays
Columns Rows 32 24 16 8 632[1] 624[1] 616[1] 608[1]
stand alone 1:8
16 x 2[2] 640[2] 24[2] 32[2]
alphanumeric displays and dot matrix graphic displays
In mixed mode, the device functions as both a row and column driver. It can be used in small stand-alone applications, or for larger displays with up to 15 PCF8579s (31 PCF8579s when two slave addresses are used). See Table 4 for common display configurations. In row mode, the device functions as a row driver with up to 32 row outputs and provides the clock and synchronization signals for the PCF8579. Up to 16 PCF8579s can normally be cascaded (32 when two slave addresses are used). Timing signals are derived from the on-chip oscillator, whose frequency is determined by the value of the resistor connected between pin OSC and pin VSS. Five commands are available to configure and control the operation of the device. Communication is made via a two-line bidirectional I2C-bus. The device may have one of two slave addresses. The only difference between these slave addresses is the least significant bit, which is set by the logic level applied to SA0. The PCF8578 and PCF8579 have different subaddresses. The subaddress of the PCF8578 is only defined in mixed mode and is fixed at 0111 100 (see Section 8.8.7 on page 19). The RAM may only be accessed in mixed mode and data is loaded as described for the PCF8579. Bias levels may be generated by an external potential divider with appropriate decoupling capacitors. For large displays, bias sources with high drive capability should be used. A typical mixed mode system operating with up to 15 PCF8579s is shown in Figure 5 (a stand-alone system would be identical but without the PCF8579).
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Product data sheet Rev. 06 -- 5 May 2009
(c) NXP B.V. 2009. All rights reserved. PCF8578_6
NXP Semiconductors
LCD DISPLAY
n rows VDD C R1 V2 C R2 V3 HOST MICROCONTROLLER SCL SDA C R2 V5 C R1 VLCD VSS VSS VLCD OSC
Rext(OSC)
40 n columns
VDD 40 columns
VDD VLCD
VDD VLCD VSS SA0 SDA SCL CLK SYNC V4
A0 A1 subaddress 1 VSS/VDD
C
R3 V4
PCF8578
VSS VSS/VDD
PCF8579
A2 A3 V3
LCD row/column driver for dot matrix graphic displays
SA0
VSS/VDD
SDA SCL CLK SYNC
PCF8578
msa843
9 of 46
Fig 5.
Typical mixed mode configuration
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
Table 5 shows the relative values of the resistors required in the configuration of Figure 5 to produce the standard multiplex rates.
Table 5. Resistors R1 R2 R3 Multiplex rates and resistor values for Figure 5 Multiplex rate (1:n) n=8 R n = 16, 24, 32 R R
( n - 2 )R ( 3 - n )R
( n - 3 )R
8.2 Power-on reset
At power-on the PCF8578 resets to a defined starting condition as follows: 1. Display blank 2. 1:32 multiplex rate, row mode 3. Start bank 0 selected 4. Data pointer is set to X, Y address 0, 0 5. Character mode 6. Subaddress counter is set to 0 7. I2C-bus interface is initialized Remark: Do not transfer data on the I2C-bus for at least 1 ms after power-on to allow the reset action to complete.
8.3 Multiplexed LCD bias generation
The bias levels required to produce maximum contrast depend on the multiplex rate and the LCD threshold voltage (Vth). Vth is typically defined as the RMS voltage at which the LCD exhibits 10 % contrast. Table 6 shows the optimum voltage bias levels and Table 7 the discrimination ratios (D) for the different multiplex rates as functions of Voper. V oper = V DD - V LCD The RMS on-state voltage (Von(RMS)) for the LCD is calculated with the equation V on ( RMS ) =
V oper
(1)
1 n-1 -- + -----------------------n n( n + 1)
(2)
and the RMS off-state voltage (Voff(RMS)) with the equation V off ( RMS ) =
V oper
2( n - 1) -----------------------------n( n + 1 )2
(3)
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PCF8578
LCD row/column driver for dot matrix graphic displays
where the values for n are determined by the multiplex rate (1:n). Valid values for n are: n = 8 for 1:8 multiplex n = 16 for 1:16 multiplex n = 24 for 1:24 multiplex n = 32 for 1:32 multiplex
Table 6. Optimum LCD voltages Multiplex rate 1:8 1:16 0.800 1:24 0.830 1:32 0.850 0.739
Bias ratios
V2 ------------V oper V3 ------------V oper V4 ------------V oper V5 ------------V oper
Table 7.
0.522
0.600
0.661
0.700
0.478
0.400
0.339
0.300
0.261
0.200
0.170
0.150
Discrimination ratios Multiplex rate 1:8 0.297 1:16 0.245 1:24 0.214 1:32 0.193
Discrimination ratios
V off ( RMS ) -----------------------V oper V on ( RMS ) ----------------------V oper V on ( RMS ) D = -----------------------V off ( RMS ) V oper ------------V th
0.430
0.316
0.263
0.230
1.447
1.291
1.230
1.196
3.370
4.080
4.680
5.190
Figure 6 shows the values of Table 6 as graphs.
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PCF8578
LCD row/column driver for dot matrix graphic displays
1.0 Vbias Voper 0.8 V3/Voper 0.6 V4/Voper 0.4 V2/Voper
msa838
V5/Voper 0.2
0
1:8
1:16
1:24 1:32 multiplex rate
Vbias = V2, V3, V4, V5; see Table 6.
Fig 6.
Vbias/Voper as a function of the multiplex rate
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PCF8578
LCD row/column driver for dot matrix graphic displays
8.4 LCD drive mode waveforms
Tfr VDD V2 V3 V4 V5 VLCD VDD V2 V3 V4 V5 VLCD SYNC 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 4 5 6 7 ON OFF
ROW 0
1:8
COLUMN
ROW 0
VDD V2 V3 V4 V5 VLCD VDD V2 V3 V4 V5 VLCD SYNC
1:16
COLUMN
VDD V2 ROW 0 V3 V4 V5 VLCD VDD V2 COLUMN V3 V4 V5 VLCD SYNC
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
1:24
VDD V2 ROW 0 V3 V4 V5 VLCD VDD V2 COLUMN V3 V4 V5 VLCD SYNC
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
1:32
msa841
column display
Fig 7.
LCD row and column waveforms
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PCF8578
LCD row/column driver for dot matrix graphic displays
Tfr VDD V2 V3 V4 V5 VLCD VDD V2 V3 V4 V5 VLCD VDD V2 V3 V4 V5 VLCD VDD V2 V3 V4 V5 VLCD
state 1 (OFF) state 2 (ON)
ROW 1 R1 (t)
ROW 2 R2 (t)
dot matrix 1:8 multiplex rate
COL 1 C1 (t)
COL 2 C2 (t)
Voper
0.261 Voper Vstate 1(t) 0V 0.261 Voper
Voper Voper 0.478 Voper 0.261 Voper Vstate 2(t) 0V 0.261 Voper 0.478 Voper Voper
msa840
Vstate1(t) = C1(t) - R1(t).
V on ( RMS ) ---------------------- = V oper
1 8-1 -- + ----------------------- = 0.430 8 8( 8 + 1)
Vstate2(t) = C2(t) - R2(t).
V off ( RMS ) ----------------------- = V oper Fig 8.
2( 8 - 1) ------------------------------ = 0.297 8( 8 + 1 )2
LCD drive mode waveforms for 1:8 multiplex rate
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PCF8578
LCD row/column driver for dot matrix graphic displays
Tfr VDD V2 V3 V4 V5 VLCD VDD V2 V3 V4 V5 VLCD VDD V2 V3 V4 V5 VLCD VDD V2 V3 V4 V5 VLCD Voper 0.2 Voper 0V 0.2 Voper
state 1 (OFF) state 2 (ON)
ROW 1 R1 (t)
ROW 2 R2 (t)
COL 1 C1 (t)
dot matrix 1:16 multiplex rate
COL 2 C2 (t)
Vstate 1(t)
Voper Voper 0.6 Voper Vstate 2(t) 0.2 Voper 0V 0.2 Voper 0.6 Voper Voper
msa836
Vstate1(t) = C1(t) - R1(t).
V on ( RMS ) ---------------------- = V oper
1 16 - 1 ----- + ------------------------------ = 0.316 16 16 ( 16 + 1 ) 2 ( 16 - 1 ) ------------------------------------ = 0.254 16 ( 16 + 1 ) 2
Vstate2(t) = C2(t) - R2(t).
V off ( RMS ) ----------------------- = V oper Fig 9.
LCD drive mode waveform for 1:16 multiplex rate
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PCF8578
LCD row/column driver for dot matrix graphic displays
8.5 Oscillator
8.5.1 Internal clock
The clock signal for the system may be generated by the internal oscillator and prescaler. The frequency is determined by the value of the resistor Rext(OSC), see Figure 10. For normal use a value of 330 k is recommended. The clock signal, for cascaded PCF8579s, is output at CLK and has a frequency of 16 (multiplex rate 1:8, 1:16 and 1:32) or 18 (multiplex rate 1:24) of the oscillator frequency.
msa837
103 fosc (kHz)
102
10
1 10
102
103
104 Rext(OSC) (k)
To avoid capacitive coupling, which could adversely affect oscillator stability, Rext(OSC) should be placed as closely as possible to the OSC pin. If this proves to be a problem, a filtering capacitor may be connected in parallel to Rext(OSC).
Fig 10. Oscillator frequency as a function of external oscillator resistor, Rext(OSC)
8.5.2 External clock
If an external clock is used, OSC must be connected to VDD and the external clock signal to CLK. Table 8 summarizes the nominal CLK and SYNC frequencies.
Table 8. Signal frequencies required for nominal 64 Hz frame frequency[1] Frame frequency, ffr (Hz) 64 64 Multiplex rate, Division ratio Clock frequency, (1:n) fclk (Hz) 1:8, 1:16, 1:32 6 1:24 8 2048 1536
Oscillator frequency, fosc (Hz)[2] 12288 12288
[1] [2]
A clock signal must always be present, otherwise the LCD may be frozen in a DC state. Rext(OSC) = 330 k.
8.6 Timing generator
The timing generator of the PCF8578 organizes the internal data flow of the device and generates the LCD frame synchronization pulse SYNC, whose period is an integer multiple of the clock period. In cascaded applications, this signal maintains the correct timing relationship between the PCF8578 and PCF8579s in the system.
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PCF8578
LCD row/column driver for dot matrix graphic displays
8.7 Row and column drivers
Outputs R0 to R7 and C32 to C39 are fixed as row and column drivers respectively. The remaining 24 outputs R8/C8 to R31/C31 are programmable and may be configured (in blocks of 8) to be either row or column drivers. The row select signal is produced sequentially at each output from R0 up to the number defined by the multiplex rate (see Table 4). In mixed mode the remaining outputs are configured as columns. In row mode all programmable outputs (R8/C8 to R31/C31) are defined as row drivers and the outputs C32 to C39 should be left open-circuit. Using a 1:16 multiplex rate, two sets of row outputs are driven, thus facilitating split-screen configurations, i.e. a row select pulse appears simultaneously at R0 and R16/C16, R1 and R17/C17 etc. Similarly, using a multiplex rate of 1:8, four sets of row outputs are driven simultaneously. Driver outputs must be connected directly to the LCD. Unused outputs should be left open circuit. Depending on the multiplex rate the following outputs are rows:
* * * *
In MUX 1:8 R0 to R7 In MUX 1:16 R0 to R15/C15 In MUX 1:24 R0 to R23/C23 In MUX 1:32 R0 to R31/C31
The configuration of the outputs (row or column) and the selection of the appropriate driver waveforms are controlled by the display mode controller.
8.8 Characteristics of the I2C-bus
The I2C-bus is for bidirectional, two-line communication between different ICs or modules. The two lines are a Serial Data Line (SDA) and a Serial Clock Line (SCL) which must be connected to a positive supply via a pull-up resistor. Data transfer may be initiated only when the bus is not busy.
8.8.1 Bit transfer
One data bit is transferred during each clock pulse. The data on the SDA line must remain stable during the HIGH period of the clock pulse as changes in the data line at this moment will be interpreted as control signals.
8.8.2 START and STOP conditions
Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW transition of the data line, while the clock is HIGH, is defined as the START condition (S). A LOW-to-HIGH transition of the data line while the clock is HIGH, is defined as the STOP condition (P).
8.8.3 System configuration
A device transmitting a message is a transmitter, a device receiving a message is the receiver. The device that controls the message flow is the master and the devices which are controlled by the master are the slaves.
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PCF8578
LCD row/column driver for dot matrix graphic displays
8.8.4 Acknowledge
The number of data bytes transferred between the START and STOP conditions from transmitter to receiver is unlimited. Each data byte of eight bits is followed by one acknowledge bit. The acknowledge bit is a HIGH level put on the bus by the transmitter, whereas the master generates an extra acknowledge related clock pulse. A slave receiver which is addressed must generate an acknowledge after the reception of each byte. Also a master must generate an acknowledge after the reception of each byte that has been clocked out of the slave transmitter. The device that acknowledges must pull down the SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during the HIGH period of the acknowledge related clock pulse (set-up and hold times must be taken into consideration). A master receiver must signal the end of a data transmission to the transmitter by not generating an acknowledge on the last byte that has been clocked out of the slave. In this event the transmitter must leave the data line HIGH to enable the master to generate a STOP condition.
SDA
SCL data line stable; data valid change of data allowed
mba607
Fig 11. Bit transfer
SDA
SCL S START condition P STOP condition
mba608
Fig 12. Definition of START and STOP condition
SDA SCL MASTER TRANSMITTER / RECEIVER SLAVE TRANSMITTER / RECEIVER MASTER TRANSMITTER / RECEIVER
mba605
SLAVE RECEIVER
MASTER TRANSMITTER
Fig 13. System configuration
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PCF8578
LCD row/column driver for dot matrix graphic displays
START condition SCL FROM MASTER 1 2 8
clock pulse for acknowledgement 9
DATA OUTPUT BY TRANSMITTER S DATA OUTPUT BY RECEIVER
mba606
The general characteristics and detailed specification of the I2C-bus are available on request.
Fig 14. Acknowledgement on the I2C-bus
8.8.5 I2C-bus controller
The I2C-bus controller detects the I2C-bus protocol, slave address, commands and display data bytes. It performs the conversion of the data input (serial-to-parallel) and the data output (parallel-to-serial). The PCF8578 acts as an I2C-bus slave transmitter/receiver in mixed mode, and as a slave receiver in row mode. A slave device cannot control bus communication.
8.8.6 Input filters
To enhance noise immunity in electrically adverse environments, RC low-pass filters are provided on the SDA and SCL lines.
8.8.7 I2C-bus protocol
Two 7-bit slave addresses (0111 100 and 0111 101) are reserved for both the PCF8578 and PCF8579. The least significant bit of the slave address is set by connecting input SA0 to either logic 0 (VSS) or logic 1 (VDD). Therefore, two types of PCF8578 or PCF8579 can be distinguished on the same I2C-bus which allows: 1. One PCF8578 to operate with up to 32 PCF8579s on the same I2C-bus for very large applications. 2. The use of two types of LCD multiplex schemes on the same I2C-bus. In most applications the PCF8578 will have the same slave address as the PCF8579. The I2C-bus protocol is shown in Figure 15. All communications are initiated with a START condition (S) from the I2C-bus master, which is followed by the desired slave address and read/write bit. All devices with this slave address acknowledge in parallel. All other devices ignore the bus transfer. In WRITE mode (indicated by setting the read/write bit LOW) one or more commands follow the slave address acknowledgement. The commands are also acknowledged by all addressed devices on the bus. The last command must clear the continuation bit C. After the last command a series of data bytes may follow. The acknowledgement after each byte is made only by the (A0, A1, A2 and A3) addressed PCF8579 or PCF8578 with its implicit subaddress 0. After the last data byte has been acknowledged, the I2C-bus master issues a STOP condition (P).
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NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
R/ W slave address
acknowledge by all addressed PCF8578s / PCF8579s
acknowledge by A0, A1, A2 and A3 selected PCF8578s / PCF8579s only
S
S 0 1 1 1 1 0A 0AC 0 1 byte
COMMAND
A
DISPLAY DATA
A
P
n 0 byte(s)
n 0 byte(s) update data pointers and if necessary, subaddress counter
msa830
(a)
a. Master transmits to slave receiver (WRITE mode)
acknowledge by all addressed PCF8578s / PCF8579s slave address S 0 1 1 1 1 0 A 0 AC 0 R/ W AS slave address S 011110A1A 0 acknowledge from master no acknowledge from master
S
COMMAND n 1 byte
DATA
A
DATA
1
P
R/W at this moment master transmitter becomes a master receiver and PCF8578/PCF8579 slave receiver becomes a slave transmitter (b)
n bytes
last byte update data pointers and if necessary subaddress counter
msa832
b. Master reads after sending command string (write commands; read data)
acknowledge by all addressed PCF8578s / PCF8579s slave address S 011110A1A 0
acknowledge from master
no acknowledge from master
S
DATA
A
DATA
1
P
R/ W
n bytes
last byte update data pointers and if necessary, subaddress counter
msa831
(c)
c. Master reads slave immediately after sending slave address (READ mode) Fig 15. I2C-bus protocol
In READ mode, indicated by setting the read/write bit HIGH, data bytes may be read from the RAM following the slave address acknowledgement. After this acknowledgement the master transmitter becomes a master receiver and the PCF8578 becomes a slave transmitter. The master receiver must acknowledge the reception of each byte in turn. The
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NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
master receiver must signal an end of data to the slave transmitter, by not generating an acknowledge on the last byte clocked out of the slave. The slave transmitter then leaves the data line HIGH, enabling the master to generate a STOP condition (P). Display bytes are written into, or read from the RAM at the address specified by the data pointer and subaddress counter. Both the data pointer and subaddress counter are automatically incremented, enabling a stream of data to be transferred either to, or from the intended devices. In multiple device applications, the hardware subaddress pins of the PCF8579s (A0 to A3) are connected to VSS or VDD to represent the desired hardware subaddress code. If two or more devices share the same slave address, then each device must be allocated to a unique hardware subaddress.
8.9 Display RAM
The PCF8578 contains a 32 x 40-bit static RAM which stores the display data. The RAM is divided into 4 banks of 40 bytes (4 x 8 x 40 bits). During RAM access, data is transferred to and from the RAM via the I2C-bus. The first eight columns of data (0 to 7) cannot be displayed but are available for general data storage and provide compatibility with the PCF8579. There is a direct correspondence between X-address and column output number.
8.9.1 Data pointer
The addressing mechanism for the display RAM is realized using the data pointer. This allows an individual data byte or a series of data bytes to be written into, or read from, the display RAM, controlled by commands sent on the I2C-bus.
8.9.2 Subaddress counter
The storage and retrieval of display data is dependent on the content of the subaddress counter. Storage takes place only when the contents of the subaddress counter match with the hardware subaddress. The hardware subaddress of the PCF8578, valid in mixed mode only, is fixed at 0000.
8.10 Command decoder
The command decoder identifies command bytes that arrive on the I2C-bus. The five commands available to the PCF8578 are defined in Table 9.
Table 9. Command Bit set-mode set-start-bank device-select RAM-access load-X-address Definition of PCF8578 commands Operation code 7 C C C C C 6 1 1 1 1 0 5 0 1 1 1 X[5:0] 4 T 1 0 1 3 E[1:0] 1 A[3:0] G[1:0] Y[1:0] 1 2 1 M[1:0] B[1:0] 0 Table 11 Table 12 Table 13 Table 14 Table 15 Reference
The most-significant bit of a command is the continuation bit C (see Table 10 and Figure 16). Commands are transferred in WRITE mode only.
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NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
C bit description Symbol C 0 1 Value Description continue bit last control byte in the transfer; next byte will be regarded as display data control bytes continue; next byte will be a command too
Table 10. Bit 7
MSB C REST OF OPCODE
LSB
msa833
C = 0; last command. C = 1; commands continue.
Fig 16. General information of command byte Table 11. Bit 7 6, 5 4 Set-mode - command bit description Symbol C T 0 1 3, 2 E[1:0] 00 01 10 11 1, 0 M[1:0] 01 10 11 00 Value 0, 1 10 Description see Table 10 fixed value display mode row mode mixed mode display status blank normal all segments on inverse video LCD drive mode 1:8 MUX (8 rows) 1:16 MUX (16 rows) 1:24 MUX (24 rows) 1:32 MUX (32 rows)
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NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
Set-start-bank - command bit description Symbol C B[1:0] 00 01 10 11 Value 0, 1 11111 Description see Table 10 fixed value start bank pointer (see Figure 20)[1] bank 0 bank 1 bank 2 bank 3
Table 12. Bit 7 6 to 2 1, 0
[1]
Useful for scrolling, pseudo-motion and background preparation of new display content.
Table 13. Bit 7 6 to 4 3 to 0
Device-select - command bit description Symbol C A[3:0] Value 0, 1 110 0 to 15[1] Description see Table 10 fixed value hardware subaddress; 4 bit binary value; transferred to the subaddress counter to define one of sixteen hardware subaddresses
[1]
Values shown in decimal.
Table 14. Bit 7 6 to 4 3, 2
RAM-access - command bit description Symbol C G[1:0] Value 0, 1 111 Description see Table 10 fixed value RAM access mode; defines the auto-increment behavior of the address for RAM access (see Figure 18) 00 01 10 11 character half-graphic full-graphic not allowed[1] RAM row address; two bits of immediate data, transferred to the Y-address pointer to define one of four display RAM rows (see Figure 17)
1, 0
Y[1:0]
0 to 3[2]
[1] [2]
See operation code for set-start-bank in Table 12. Values shown in decimal.
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Product data sheet
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NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
Load-X-address - command bit description Symbol C X[5:0] Value 0, 1 0 0 to 39[1] Description see Table 10 fixed value RAM column address; six bits of immediate data, transferred to the X-address pointer to define one of forty display RAM columns (see Figure 17)
Table 15. Bit 7 6 5 to 0
[1]
Values shown in decimal.
8.11 RAM access
1 byte 0 LSB Y address Y max
MSB
0
X address
X max
001aaj920
Fig 17. RAM addressing scheme
RAM operations are only possible when the PCF8578 is in mixed mode. In this event its hardware subaddress is internally fixed at 0000 and the hardware subaddresses of any PCF8579 used in conjunction with the PCF8578 must start at 0001. There are three RAM-access modes:
* Character * Half-graphic * Full-graphic
These modes are specified by the bits G[1:0] of the RAM-access command. The RAM-access command controls the order in which data is written to or read from the RAM (see Figure 18). To store RAM data, the user specifies the location into which the first byte will be loaded (see Figure 19):
* Device subaddress (specified by the device-select command) * RAM X-address (specified by the bits X[5:0] of the load-X-address command) * RAM bank (specified by the bits Y[1:0] of the RAM-access command)
Subsequent data bytes will be written or read according to the chosen RAM-access mode. Device subaddresses are automatically incremented between devices until the last device is reached. If the last device has subaddress 15, further display data transfers will lead to a wrap-around of the subaddress to 0.
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Product data sheet Rev. 06 -- 5 May 2009
(c) NXP B.V. 2009. All rights reserved. PCF8578_6
NXP Semiconductors
PCF8578/PCF8579
driver 1
PCF8579
driver 2 driver k
bank 0 bank 1 bank 2 bank 3 PCF8578/PCF8579 system RAM 1 k 16 LSB
RAM 4 bytes
40-bits
1 byte
0
1
2
3
4
5
6
7
8
9 10 11 character mode
LCD row/column driver for dot matrix graphic displays
MSB 0 2 bytes 1 3 5 7 9 11 13 15 17 19 21 23 half-graphic mode 2 4 6 8 10 12 14 16 18 20 22
0 1 4 bytes 2 3
4 5
8 12 16 20 24 28 32 36 40 44 9 13 17 21 25 29 33 37 41 45
6 10 14 18 22 26 30 34 38 42 46 7 11 15 19 23 27 31 35 39 43 47 RAM data bytes are written or read as indicated above full-graphic mode
msa849
PCF8578
25 of 46
Fig 18. RAM access mode
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Product data sheet Rev. 06 -- 5 May 2009
S
(c) NXP B.V. 2009. All rights reserved. PCF8578_6
NXP Semiconductors
DEVICE SELECT: subaddress 12 RAM ACCESS: character mode bank 1 RAM bank 0 bank 1 bank 2 bank 3
LOAD X-ADDRESS: X-address = 8 R/ W slave address
LCD row/column driver for dot matrix graphic displays
READ R /W slave address DEVICE SELECT LOAD X-ADDRESS RAM ACCESS
S S 011110A1A 0
DATA
A
S 011110A0A11101100A10001000A01110001A 0 last command DATA A DATA A
msa835
WRITE
PCF8578
26 of 46
Fig 19. Example of commands specifying initial data byte RAM locations
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
8.12 Display control
The display is generated by continuously shifting rows of RAM data to the dot matrix LCD via the column outputs. The number of rows scanned depends on the multiplex rate set by bits M[1:0] of the set-mode command.
RAM bank 0 top of LCD
bank 1
LCD
bank 2
bank 3
msa851
1:32 multiplex rate and start bank = 2.
Fig 20. Relationship between display and set-start-bank
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Product data sheet
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NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
The display status (all dots on or off and normal or inverse video) is set by the bits E[1:0] of the set-mode command. For bank switching, the RAM bank corresponding to the top of the display is set by the bits B[1:0] of the set-start-bank command. This is shown in Figure 20. This feature is useful when scrolling in alphanumeric applications.
9. Limiting values
Table 16. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol VDD VLCD VI Parameter supply voltage LCD supply voltage input voltage VDD related; on pins SDA, SCL, CLK, TEST, SA0 and OSC VLCD related; V2 to V5 VO output voltage VDD related; SYNC and CLK VLCD related; R0 to R7, R8/C8 to R31/C31 and C32 to C39 II IO IDD IDD(LCD) ISS Ptot Po Tstg
[1]
Conditions
Min -0.5 VDD - 11 -0.5
Max +8.0 +8.0 +8.0
Unit V V V
VDD - 11 -0.5 VDD - 11
+8.0 +8.0 +8.0
V V V
input current output current supply current LCD supply current ground supply current total power dissipation output power storage temperature
[1]
-10 -10 -50 -50 -50 per package -65
+10 +10 +50 +50 +50 400 100 +150
mA mA mA mA mA mW mW C
According to the NXP store and transport conditions (document SNW-SQ-623) the devices have to be stored at a temperature of +5 C to +45 C and a humidity of 25 % to 75 %.
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NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
10. Static characteristics
Table 17. Static characteristics VDD = 2.5 V to 6 V; VSS = 0 V; VLCD = VDD - 3.5 V to VDD - 9 V; Tamb = -40 C to +85 C; unless otherwise specified. Symbol Supplies VDD VLCD IDD supply voltage LCD supply voltage supply current external clock; fclk = 2 kHz internal clock; Rext(OSC) = 330 k VPOR Logic VIL VIH IOL LOW-level input voltage HIGH-level input voltage LOW-level output current at pins SYNC and CLK; VOL = 1 V; VDD = 5 V at pin SDA; VOL = 0.4 V; VDD = 5 V IOH IL HIGH-level output current leakage current at pins SYNC and CLK; VOH = 4 V; VDD = 5 V; at pins SDA, SCL, SYNC, CLK, TEST and SA0; Vi = VDD or VSS at pin OSC; Vi = VDD Ci IL Voffset(DC) RO capacitance for each I/O pin leakage current DC offset voltage output resistance at pins V2 to V5; Vi = VDD or VLCD on pins R0 to R7, R8/C8 to R31/C31 and C32 to C39 on row output pins: R0 to R7 and R8/C8 to R31/C31 on column output pins: R8/C8 to R31/C31 and C32 to C39
[1] [2] [3] [4]
[4] [3] [1]
Parameter
Conditions
Min 2.5 VDD - 9 [2]
Typ 6 20 1.3 -
Max 6.0 VDD - 3.5 15 50 1.8 0.3VDD VDD -1 +1
Unit V V A A V V V mA mA mA mA
power-on reset voltage
0.8 VSS 0.7VDD 1 3 -1
-1 -2 -
20 1.5 3
+1 5 +2 3 6
A pF A mV k k
LCD outputs
[4]
Outputs are open; inputs at VDD or VSS; I2C-bus inactive; external clock with 50 % duty factor. Resets all logic when VDD < VPOR. Periodically sampled; not 100 % tested. Resistance measured between output terminal (R0 to R7, R8/C8 to R31/C31 and C32 to C39) and bias input (V2 to V5, VDD and VLCD) when the specified current flows through one output under the following conditions (see Table 6 on page 11): a) Voper = VDD - VLCD = 9 V. b) Row mode, R0 to R7 and R8/C8 to R31/C31: V2 - VLCD 6.65 V; V5 - VLCD 2.35 V; Iload = 150 A. c) Column mode, R8/C8 to R31/C31 and C32 to C39: V3 - VLCD 4.70 V; V4 - VLCD 4.30 V; Iload = 100 A.
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Product data sheet
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PCF8578
LCD row/column driver for dot matrix graphic displays
11. Dynamic characteristics
Table 18. Dynamic characteristics All timing values are referenced to VIH and VIL levels with an input voltage swing of VSS to VDD. VDD = 2.5 V to 6 V; VSS = 0 V; VLCD = VDD - 3.5 V to VDD - 9 V; Tamb = -40 C to +85 C; unless otherwise specified. Symbol fclk Parameter clock frequency Conditions at multiplex rate 1:8, 1:16 and 1:32; Rext(OSC) = 330 k; VDD = 6 V at multiplex rate 1:24; Rext(OSC) = 330 k; VDD = 6 V tPD(SYNC_N) SYNC propagation delay tPD(drv) I2C-bus fSCL tw(spike) tBUF tSU;STA tHD;STA tLOW tHIGH tr tf tSU;DAT tHD;DAT tSU;STO SCL clock frequency spike pulse width bus free time between a STOP and START condition set-up time for a repeated START condition hold time (repeated) START condition LOW period of the SCL clock HIGH period of the SCL clock rise time of both SDA and SCL signals fall time of both SDA and SCL signals data set-up time data hold time set-up time for STOP condition 4.7 4.7 4.0 4.7 4.0 250 0 4.0 4.0 100 100 1 0.3 kHz ns s s s s s s s ns ns s driver propagation delay VDD - VLCD = 9 V; with test load of 45 pF Min 1.2 Typ 2.1 Max 3.3 Unit kHz
0.9
1.6
2.5
kHz
-
-
500 100
ns s
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Product data sheet
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NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
1/fclk 0.7 VDD 0.3 VDD
CLK
SYNC
0.7 VDD 0.3 VDD tPD(SYNC_N) tPD(SYNC_N)
C39 to C32, R31/C31 to R8/C8 and R7 to R0
0.5 V (VDD - VLCD = 9 V) 0.5 V tPD(drv)
msa834
Fig 21. Driver timing waveforms
SDA
tBUF
tLOW
tf
SCL
tHD;STA
tr
tHD;DAT
tHIGH
tSU;DAT
SDA
tSU;STA tSU;STO
mga728
Fig 22. I2C-bus timing waveforms
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Product data sheet Rev. 06 -- 5 May 2009
(c) NXP B.V. 2009. All rights reserved. PCF8578_6
12. Application information
NXP Semiconductors
LCD DISPLAY
R0 R1
R2
R3
R4
R5
R6
R7
R8/ R9/ R10/ R11/ R12/ R13/ R14/ R15/ R16/ R17/ R18/ R19/ R20/ R21/ R22/ R23/ R24/ R25/ R26/ R27/ C8 C9 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27
PCF8578
LCD row/column driver for dot matrix graphic displays
VSS SA0 OSC VDD V2 SDA SCL SYNC CLK TEST
V3
V4
R31/ R30/ R29/ R28/ V5 VLCD n.c. n.c. C39 C38 C37 C36 C35 C34 C33 C32 C31 C30 C29 C28
Rext(OSC)
msa844
PCF8578
32 of 46
Fig 23. Stand alone application using 8 rows and 32 columns
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
R0
e
a f g c d dp b
PCF8578: Segment Driver Application one line of 24 digits 7 segment one line of 12 digits star-burst (mux 1:16) Total: 384 segments
R7 R8
LCD
R15 1 12
(Using 1:16 mux, the first character data must be loaded in bank 0 and 1 starting at byte number 16) 0
C16
C17
C39
16
17
39 Bank 0 1
(1)
FR
DISPLAY RAM PCF8578
EE
R
AM
a LSB b f g c e d dp MSB
ALTERNATE DISPLAY BANK ALTERNATE DISPLAY BANK
2
3
mlb423
1-byte
Fig 24. Segment driver application for up to 384 segments
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Product data sheet Rev. 06 -- 5 May 2009
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NXP Semiconductors
VDD VDD
C C C C C R
32 V2 rows LCD DISPLAY
R
1:32 multiplex rate 32 x 40 x k dots (k 16) (20480 dots max.)
V3
(4 2 3)R 8
V4
R
PCF8578
(ROW MODE)
unused columns VDD VDD VLCD
40 columns A0 #1 A1 A2
subaddress 0 VDD VDD VLCD V3
40 columns A0 #2 A1 A2
subaddress 1 VDD VDD VLCD V3
40 columns
subaddress k-1 A0
V5
R
SA0 VLCD
VSS
LCD row/column driver for dot matrix graphic displays
#k
A1 A2
VLCD
VSS
OSC
V3
Rext(OSC)
PCF8579
PCF8579
PCF8579
VSS SDA SCL CLK SYNC VSS VDD
V4 A3 VSS SYNC CLK SCL SDA SA0
VSS VSS
V4 A3 VSS SYNC CLK SCL SDA SA0 VSS VSS
V4 A3 VSS SYNC CLK SCL SDA SA0 VSS VSS
SCL SDA
msa845
PCF8578
34 of 46
Fig 25. Typical LCD driver system with 1:32 multiplex rate
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Product data sheet Rev. 06 -- 5 May 2009
VDD SCL SDA
msa847
PCF8578_6
VDD VSS VDD VSS VDD VSS SA0 SDA SCL CLK SYNC VSS V3 A3 A2 A1 A0 40 columns #k V4 VLCD VDD VDD SA0 SDA SCL CLK SYNC VSS V3 A3 A2 A1 A0 40 columns 1:16 multiplex rate 16 x 40 x k dots (k 16) (10240 dots max.) 1:16 multiplex rate 16 x 40 x k dots (k 16) (10240 dots max.) 40 columns VDD VLCD V3 VSS OSC
Rext(OSC)
NXP Semiconductors
SA0 SDA SCL CLK SYNC VSS A3 V3 A2 A1 VDD A0 40 columns #1 V4 VLCD VDD VDD
#2
V4 VLCD VDD
PCF8579
PCF8579
PCF8579
subaddress k 1 VDD VDD
C R
subaddress 1
subaddress 0
16 rows LCD DISPLAY
LCD row/column driver for dot matrix graphic displays
V2
C R
16 rows
V3
C R
V4
C R
PCF8578
(ROW MODE)
8 unused columns VDD VSS/VDD
subaddress 0 VDD VDD VLCD V3 V4 VSS VSS #2
40 columns
subaddress 1 VDD VDD VLCD V3 V4 VSS VSS #k
40 columns
subaddress k 1
V5
C R
SA0 VLCD
A0 #1 A1 A2 A3 SYNC CLK SCL SDA SA0 VSS
A0 A1 A2 A3 SYNC CLK SCL SDA SA0 VSS
A0 A1 A2 A3 SYNC CLK SCL SDA SA0 VSS
VLCD
PCF8579
PCF8579
PCF8579
V4 VSS VSS
VSS SDA SCL CLK SYNC
VSS
PCF8578
(c) NXP B.V. 2009. All rights reserved.
35 of 46
Fig 26. Split screen application with 1:16 multiplex rate for improved contrast
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Product data sheet Rev. 06 -- 5 May 2009
VDD SCL SDA
msa846
PCF8578_6
VDD VSS VDD VSS VDD VSS SA0 SDA SCL CLK SYNC VSS A3 A2 A1 A0 40 columns #k V3 V4 VLCD VDD VDD SA0 SDA SCL CLK SYNC VSS A3 A2 A1 A0 40 columns 1:32 multiplex rate 32 x 40 x k dots (k 16) (20480 dots max.) 32 32 rows 1:32 multiplex rate 32 x 40 x k dots (k 16) (20480 dots max.) 40 columns VDD VLCD V3 VSS VSS OSC
Rext(OSC)
NXP Semiconductors
SA0 SDA SCL CLK SYNC VSS A3 A2 A1 VDD A0 40 columns #1 V3 V4 VLCD VDD VDD
V3 #2 V4 VLCD VDD
PCF8579
PCF8579
PCF8579
subaddress k 1 VDD VDD
C R
subaddress 1
subaddress 0
LCD DISPLAY
LCD row/column driver for dot matrix graphic displays
V2
C R (4 2 3)R
V3
C
V4
C R
PCF8578
(ROW MODE)
8 unused columns VDD VSS/VDD
subaddress 0 VDD VDD VLCD V3 V4 #2
40 columns
subaddress 1 VDD VDD VLCD V3 V4 #k
40 columns
subaddress k 1
V5
C R
SA0 VLCD
A0 #1 A1 A2 A3 SCL SDA SA0 VSS
A0 A1 A2 A3
A0 A1 A2
VLCD
PCF8579
PCF8579
PCF8579
V4 VSS SYNC CLK VSS
SDA SCL CLK SYNC
VSS SYNC CLK SCL SDA SA0 VSS VSS
A3 VSS SYNC CLK SCL SDA SA0 VSS VSS
VSS
PCF8578
(c) NXP B.V. 2009. All rights reserved.
36 of 46
Fig 27. Split screen application with 1:32 multiplex rate
xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxx x x x xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xx xx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxx x x xxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxx xxx
Product data sheet Rev. 06 -- 5 May 2009
(c) NXP B.V. 2009. All rights reserved. PCF8578_6
NXP Semiconductors
VSS SCL VDD VLCD SDA
R0
R
Rext(OSC) (4 2 3)R RR R
n.c. n.c.
LCD DISPLAY
PCF8578
LCD row/column driver for dot matrix graphic displays
R31/C31 C0 C27 C28 C39 C0 C27 C28 C39
PCF8579
PCF8579
n. c.
n. c.
to other PCF8579s
msa852
PCF8578
37 of 46
Fig 28. Example of wiring, single screen with 1:32 multiplex rate (PCF8578 in row driver mode)
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
13. Package outline
VSO56: plastic very small outline package; 56 leads SOT190-1
D
E
A X
c y HE vM A
Z 56 29
Q A2 A1 pin 1 index Lp L 1 e bp 28 wM detail X (A 3) A
0
5 scale
10 mm
DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT mm inches A max. 3.3 0.13 A1 0.3 0.1 0.012 0.004 A2 3.0 2.8 0.12 0.11 A3 0.25 0.01 bp 0.42 0.30 c 0.22 0.14 D (1) 21.65 21.35 E (2) 11.1 11.0 e 0.75 HE 15.8 15.2 L 2.25 0.089 Lp 1.6 1.4 0.063 0.055 Q 1.45 1.30 v 0.2 w 0.1 y 0.1 Z (1) 0.90 0.55
0.017 0.0087 0.85 0.012 0.0055 0.84
0.44 0.62 0.0295 0.43 0.60
0.057 0.035 0.008 0.004 0.004 0.051 0.022
7o o 0
Notes 1. Plastic or metal protrusions of 0.3 mm (0.012 inch) maximum per side are not included. 2. Plastic interlead protrusions of 0.25 mm (0.01 inch) maximum per side are not included. OUTLINE VERSION SOT190-1 REFERENCES IEC JEDEC JEITA EUROPEAN PROJECTION
ISSUE DATE 97-08-11 03-02-19
Fig 29. Package outline SOT190-1 (VSO56) of PCF8578T/1
PCF8578_6 (c) NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 -- 5 May 2009
38 of 46
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
LQFP64: plastic low profile quad flat package; 64 leads; body 10 x 10 x 1.4 mm
SOT314-2
c
y X A 48 49 33 32 ZE
e E HE wM bp 64 1 pin 1 index 16 ZD bp D HD wM B vM B vM A 17 detail X L Lp A A2 A1 (A 3)
e
0
2.5 scale
5 mm
DIMENSIONS (mm are the original dimensions) UNIT mm A max. 1.6 A1 0.20 0.05 A2 1.45 1.35 A3 0.25 bp 0.27 0.17 c 0.18 0.12 D (1) 10.1 9.9 E (1) 10.1 9.9 e 0.5 HD HE L 1 Lp 0.75 0.45 v 0.2 w 0.12 y 0.1 Z D (1) Z E (1) 1.45 1.05 1.45 1.05 7o o 0
12.15 12.15 11.85 11.85
Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT314-2 REFERENCES IEC 136E10 JEDEC MS-026 JEITA EUROPEAN PROJECTION
ISSUE DATE 00-01-19 03-02-25
Fig 30. Package outline SOT314-2 (LQFP64) of PCF8578H/1
PCF8578_6 (c) NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 -- 5 May 2009
39 of 46
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
TQFP64: plastic thin quad flat package; 64 leads; body 10 x 10 x 1.0 mm
SOT357-1
c
y X A 48 49 33 32 ZE
e E HE A wM pin 1 index bp 17 1 16 ZD bp D HD wM B vM B vM A detail X Lp L A2 A 1 (A 3)
64
e
0
2.5 scale
5 mm
DIMENSIONS (mm are the original dimensions) UNIT mm A max. 1.2 A1 0.15 0.05 A2 1.05 0.95 A3 0.25 bp 0.27 0.17 c 0.18 0.12 D (1) 10.1 9.9 E (1) 10.1 9.9 e 0.5 HD HE L 1 Lp 0.75 0.45 v 0.2 w 0.08 y 0.1 Z D(1) Z E(1) 1.45 1.05 1.45 1.05 7 o 0
o
12.15 12.15 11.85 11.85
Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT357-1 REFERENCES IEC 137E10 JEDEC MS-026 JEITA EUROPEAN PROJECTION
ISSUE DATE 00-01-19 02-03-14
Fig 31. Package outline SOT357-1 (TQFP64) of PCF8578HT/1
PCF8578_6 (c) NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 -- 5 May 2009
40 of 46
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
14. Soldering of SMD packages
This text provides a very brief insight into a complex technology. A more in-depth account of soldering ICs can be found in Application Note AN10365 "Surface mount reflow soldering description".
14.1 Introduction to soldering
Soldering is one of the most common methods through which packages are attached to Printed Circuit Boards (PCBs), to form electrical circuits. The soldered joint provides both the mechanical and the electrical connection. There is no single soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and Surface Mount Devices (SMDs) are mixed on one printed wiring board; however, it is not suitable for fine pitch SMDs. Reflow soldering is ideal for the small pitches and high densities that come with increased miniaturization.
14.2 Wave and reflow soldering
Wave soldering is a joining technology in which the joints are made by solder coming from a standing wave of liquid solder. The wave soldering process is suitable for the following:
* Through-hole components * Leaded or leadless SMDs, which are glued to the surface of the printed circuit board
Not all SMDs can be wave soldered. Packages with solder balls, and some leadless packages which have solder lands underneath the body, cannot be wave soldered. Also, leaded SMDs with leads having a pitch smaller than ~0.6 mm cannot be wave soldered, due to an increased probability of bridging. The reflow soldering process involves applying solder paste to a board, followed by component placement and exposure to a temperature profile. Leaded packages, packages with solder balls, and leadless packages are all reflow solderable. Key characteristics in both wave and reflow soldering are:
* * * * * *
Board specifications, including the board finish, solder masks and vias Package footprints, including solder thieves and orientation The moisture sensitivity level of the packages Package placement Inspection and repair Lead-free soldering versus SnPb soldering
14.3 Wave soldering
Key characteristics in wave soldering are:
* Process issues, such as application of adhesive and flux, clinching of leads, board
transport, the solder wave parameters, and the time during which components are exposed to the wave
* Solder bath specifications, including temperature and impurities
PCF8578_6 (c) NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 -- 5 May 2009
41 of 46
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
14.4 Reflow soldering
Key characteristics in reflow soldering are:
* Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to
higher minimum peak temperatures (see Figure 32) than a SnPb process, thus reducing the process window
* Solder paste printing issues including smearing, release, and adjusting the process
window for a mix of large and small components on one board
* Reflow temperature profile; this profile includes preheat, reflow (in which the board is
heated to the peak temperature) and cooling down. It is imperative that the peak temperature is high enough for the solder to make reliable solder joints (a solder paste characteristic). In addition, the peak temperature must be low enough that the packages and/or boards are not damaged. The peak temperature of the package depends on package thickness and volume and is classified in accordance with Table 19 and 20
Table 19. SnPb eutectic process (from J-STD-020C) Package reflow temperature (C) Volume (mm3) < 350 < 2.5 2.5 Table 20. 235 220 Lead-free process (from J-STD-020C) Package reflow temperature (C) Volume (mm3) < 350 < 1.6 1.6 to 2.5 > 2.5 260 260 250 350 to 2000 260 250 245 > 2000 260 245 245 350 220 220
Package thickness (mm)
Package thickness (mm)
Moisture sensitivity precautions, as indicated on the packing, must be respected at all times. Studies have shown that small packages reach higher temperatures during reflow soldering, see Figure 32.
PCF8578_6
(c) NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 -- 5 May 2009
42 of 46
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
temperature
maximum peak temperature = MSL limit, damage level
minimum peak temperature = minimum soldering temperature
peak temperature
time
001aac844
MSL: Moisture Sensitivity Level
Fig 32. Temperature profiles for large and small components
For further information on temperature profiles, refer to Application Note AN10365 "Surface mount reflow soldering description".
15. Abbreviations
Table 21. Acronym CMOS DC I2C IC LCD LSB MSB MSL PCB POR RC RAM RMS SCL SDA SMD Abbreviations Description Complementary Metal Oxide Semiconductor Direct Current Inter-Integrated Circuit Integrated Circuit Liquid Crystal Display Least Significant Bit Most Significant Bit Moisture Sensitivity Level Printed-Circuit Board Power-On Reset Resistance-Capacitance Random Access Memory Root Mean Square Serial Clock Line Serial Data Line Surface Mount Device
PCF8578_6
(c) NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 -- 5 May 2009
43 of 46
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
16. Revision history
Table 22. Revision history Release date 20090505 Data sheet status Product data sheet Change notice Supersedes PCF8578_5 Document ID PCF8578_6 Modifications:
* * * * * * * *
The format of this data sheet has been redesigned to comply with the new identity guidelines of NXP Semiconductors. Legal texts have been adapted to the new company name where appropriate. Added package type TQFP64 (PCF8578HT/1) Removed bare die types Rearranged information in data sheet Corrected values for 1:32 multiplex mode in Table 4 Changed letter symbols to NXP approved symbols Added RAM addressing scheme (Figure 17) Product specification Product specification Product specification Product specification Product specification PCF8578_4 PCF8578_3 PCF8578_2 PCF8578_1 -
PCF8578_5 PCF8578_4 PCF8578_3 PCF8578_2 PCF8578_1
20030414 19980908 19970328 19961028 19940125
PCF8578_6
(c) NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 -- 5 May 2009
44 of 46
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
17. Legal information
17.1 Data sheet status
Document status[1][2] Objective [short] data sheet Preliminary [short] data sheet Product [short] data sheet
[1] [2] [3]
Product status[3] Development Qualification Production
Definition This document contains data from the objective specification for product development. This document contains data from the preliminary specification. This document contains the product specification.
Please consult the most recently issued document before initiating or completing a design. The term `short data sheet' is explained in section "Definitions". The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status information is available on the Internet at URL http://www.nxp.com.
17.2 Definitions
Draft -- The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications or additions. NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. Short data sheet -- A short data sheet is an extract from a full data sheet with the same product type number(s) and title. A short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. For detailed and full information see the relevant full data sheet, which is available on request via the local NXP Semiconductors sales office. In case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail.
damage. NXP Semiconductors accepts no liability for inclusion and/or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer's own risk. Applications -- Applications that are described herein for any of these products are for illustrative purposes only. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Limiting values -- Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) may cause permanent damage to the device. Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the Characteristics sections of this document is not implied. Exposure to limiting values for extended periods may affect device reliability. Terms and conditions of sale -- NXP Semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms, including those pertaining to warranty, intellectual property rights infringement and limitation of liability, unless explicitly otherwise agreed to in writing by NXP Semiconductors. In case of any inconsistency or conflict between information in this document and such terms and conditions, the latter will prevail. No offer to sell or license -- Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. Export control -- This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from national authorities.
17.3 Disclaimers
General -- Information in this document is believed to be accurate and reliable. However, NXP Semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. Right to make changes -- NXP Semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof. Suitability for use -- NXP Semiconductors products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental
17.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. I2C-bus -- logo is a trademark of NXP B.V.
18. Contact information
For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com
PCF8578_6
(c) NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 06 -- 5 May 2009
45 of 46
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
19. Contents
1 2 3 4 5 6 7 7.1 7.2 8 8.1 8.2 8.3 8.4 8.5 8.5.1 8.5.2 8.6 8.7 8.8 8.8.1 8.8.2 8.8.3 8.8.4 8.8.5 8.8.6 8.8.7 8.9 8.9.1 8.9.2 8.10 8.11 8.12 9 10 11 12 13 14 14.1 14.2 14.3 14.4 15 16 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Ordering information . . . . . . . . . . . . . . . . . . . . . 2 Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pinning information . . . . . . . . . . . . . . . . . . . . . . 4 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 7 Functional description . . . . . . . . . . . . . . . . . . . 8 Display configurations. . . . . . . . . . . . . . . . . . . . 8 Power-on reset . . . . . . . . . . . . . . . . . . . . . . . . 10 Multiplexed LCD bias generation . . . . . . . . . . 10 LCD drive mode waveforms . . . . . . . . . . . . . . 13 Oscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Internal clock. . . . . . . . . . . . . . . . . . . . . . . . . . 16 External clock . . . . . . . . . . . . . . . . . . . . . . . . . 16 Timing generator. . . . . . . . . . . . . . . . . . . . . . . 16 Row and column drivers . . . . . . . . . . . . . . . . . 17 Characteristics of the I2C-bus . . . . . . . . . . . . . 17 Bit transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 START and STOP conditions . . . . . . . . . . . . . 17 System configuration . . . . . . . . . . . . . . . . . . . 17 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . 18 I2C-bus controller . . . . . . . . . . . . . . . . . . . . . . 19 Input filters . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 I2C-bus protocol . . . . . . . . . . . . . . . . . . . . . . . 19 Display RAM . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Data pointer . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Subaddress counter . . . . . . . . . . . . . . . . . . . . 21 Command decoder . . . . . . . . . . . . . . . . . . . . . 21 RAM access . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Display control . . . . . . . . . . . . . . . . . . . . . . . . 27 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 28 Static characteristics. . . . . . . . . . . . . . . . . . . . 29 Dynamic characteristics . . . . . . . . . . . . . . . . . 30 Application information. . . . . . . . . . . . . . . . . . 32 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 38 Soldering of SMD packages . . . . . . . . . . . . . . 41 Introduction to soldering . . . . . . . . . . . . . . . . . 41 Wave and reflow soldering . . . . . . . . . . . . . . . 41 Wave soldering . . . . . . . . . . . . . . . . . . . . . . . . 41 Reflow soldering . . . . . . . . . . . . . . . . . . . . . . . 42 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Revision history . . . . . . . . . . . . . . . . . . . . . . . . 44 17 17.1 17.2 17.3 17.4 18 19 Legal information . . . . . . . . . . . . . . . . . . . . . . Data sheet status . . . . . . . . . . . . . . . . . . . . . . Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . Contact information . . . . . . . . . . . . . . . . . . . . Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 45 45 45 45 45 46
Please be aware that important notices concerning this document and the product(s) described herein, have been included in section `Legal information'.
(c) NXP B.V. 2009.
All rights reserved.
For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com Date of release: 5 May 2009 Document identifier: PCF8578_6

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