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Data Sheet
AS2590
(R)
Austria Mikro Systeme International
LC DISPLAY DRIVER WITH 18 DIGITS, 6 SYMBOLS AND CLOCK/TIMER
General Description
The AS2590 is an integrated CMOS device for driving a liquid crystal display intended for use in telephones. The 2-wire serial interface is compatible to the dialler AS2574B. The extreme low operating current allows the circuit to be operational also during on-hook which is necessary in order to the use of the clock function. In on-hook condition the circuit can be supplied by a small leakage current from the telephone line or from a small 3V battery. Whether the oscillator shall continue operating or be stopped during on-hook is determined by the mode pin, MS.
Key Features
u Very low operating current, typ. 30 A @ 3V u Low power oscillator using 32.768 kHz Xtal u 2-wire interface compatible to AS2574B u 18 digits by 7 segments u 6 symbols u 24 hour clock showing hours and minutes u Timer automatically showing elapsed time in minutes and seconds after each telephone conversation u 33 LCD segment outputs and 4 LCD backplane outputs u 4 times multiplex mode with a cycle time of 128 Hz u Mode select pin for selecting clock function
Package
Available in 48 pin DIP and 52 pin PLCC.
SPEECH CIRCUIT
VDD DIALLER CONTROLLER
VDD V23 MS
AS2590
32.768kHz X1 X2 BIAS Vss
V13
KEYBOARD
AS2574A/B
Vss
VLCD SDA SCL
Rev. 1
1
Dec. 1993
Data Sheet
Pin Description
DIL 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 32 33 34 35 36 37 38 39 40 41 PLCC 1 2 3 4 5 6 8 9 10 11 12 13 14 15 16 17 18 19 21 22 23 24 25 26 27 28 29 30 31 32 34 35 36 37 38 39 40 41 42 43 44 Symbol BP1 BP0 S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 V1/3 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 VSS BP3 BP2 V2/3 S32 S31 S30 S29 S28 S27 S26 S25 S24 S23 S22 S21 S20 VLCD Function Blackplanes
AS2590
Segment outputs
1/3 of VDD pin for external voltage divider Segment outputs
Negative supply pin Back plane outputs
2/3 of VDD pin for external voltage divider Segment outputs
Negative supply pin for LC display
Rev. 1
2
Dec. 1993
Data Sheet
Pin Description Continued DIL 42 43 44 45 46 47 PLCC 45 47 48 49 50 51 Symbol SDA SCL VBIAS XTAL1 XTAL2 MS Function Serial data line input to dialler/controller Clock line input of serial data link Oscillator bias input, recommended bias resistor 2.2 M
AS2590
Oscillator pins for 32.768 kHz crystal, a resistor and two capacitors
Mode select input:
MS = VSS clock/timer disabled MS = VDD clock/timer enabled
48
52
VDD
Positive supply pin
LCD Layout
SB3
SB1
SB0
SB2
SB4
SB5
D D D DD D 01 2345
SB0 = loudspeaker on (blinking with 1 Hz) SB1 = microphone muted (blinking with 1 Hz) SB2 = 2nd key function enabled SB3 = number stored SB4 = number buffered in FIFO, not stored
D D D D D DD D D DD D 6 7 8 9 10 11 12 13 14 15 16 17
Figure 1 Table 1 Segments Digits Digit Description 0 1 2 3 4 5 6 7 8 9 a b c d _ * # P/T r numbers 0...9 AB on on on on on on on on on on on on on on on on Segment CDE on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on on F on G
SB5 = colon for clock and timer (blinking when clock is shown)
on on on on on on on on on on on on on on on on on on on on on on
A F E D
Figure 2
G
B C
letter A letter B letter C Letter D underscore asterisk hash pause temp. MF recall
on
Rev. 1
3
Dec. 1993
Data Sheet
Description
Operating Modes The following two operating modes are pin selectable: Mode 0: Clock and timer are disabled and the oscillator is stopped when going on-hook (command BLANK ALL). Mode 1: Clock and timer functions are enabled, clock is displayed both during off- and on-hook (assuming that clock is set). When going from off-hook to on-hook, the timer content (elepsed time) is displayed for 6 seconds (assuming that a start timer command was received). Clock After a power up reset the clock is disabled. The clock will not be displayed until a valid set clock procedure has been performed (mode 1 only). The format of the clock is hh:mm and the leading zero of the hours is suppressed and symbol 5 (:) is blinking with a frequency of 1 Hz. The timer is running when off-hook and displayed for 6 seconds when going on-hook. The content of the timer (elapsed time) is shown in stead of the clock in the format mm:ss. If a SET CLOCK command is received the display is blanked, four underscore symbols are displayed where the 4 digits of the clock will be entered (the 4 most right digits) and symbol 5 is turned on (_ _ : _ _). The next 4 data words are interpreted as the time (hh mm). The fourth digit terminates the SET CLOCK and starts the clock with the seconds set to zero. If less than 4 data words (digits) are received the first command (normally a BLANK DIGITS or a BLANK ALL) will terminate the SET CLOCK. But as the procedure was incomplete, it is regarded as invalid and further clock display is disabled. The next valid SET CLOCK command will enable the clock again. The SET CLOCK command does not effect the timer. The time-out condition (approx. 15 seconds) when setting clock is recognized by the dialler/controller (e.g. AS2574). If a time-out condition occours the dialler sends a BLANK ALL command to terminated the SET CLOCK. Timer The following commands effect the timer: - START TIMER and START FIFO; they start the timer. If the timer is already running, it cannot be restarted by one of these commands before stopping the timer with the BLANK ALL command.
AS2590
- Power up; enables subsequent start timer commands. - BLANK ALL; clears the whole display (including special symbols) and displays the timer contents for 6 seconds (if clock/timer function is enabled) or until a new START TIMER/FIFO command is received. Then it returns to normal display mode. - if any command or data is received by the serial interface within the time out period after a BLANK ALL command, the timer display will be blanked or replaced by the clock display. The timer is displayed in the format mm:ss with the leading zero of the minutes suppressed and symbol 5 (:) turned on. LCD Outputs The 33 segment outputs and 4 backplane outputs can drive a customized liquid crystal display in 1:4 multiplex mode. Two reference voltages V1/3 and V2/3 are provided by an external voltage divider. Digits and Special Symbols The display consists of 18 seven segment digits and 6 special symbols (see figure 1): - D0...D17; D0 is the most left seven segment digit, the possible numbers displayed by one digit are shown in figure 2. The symbol (_) is only displayed at D13, D14, D16 and D17 when setting the clock. - SB0...SB5; 6 special symbols (one segment for each symbol only), see figure 1 for reference. If SB0 (loudspeaker on) or SB1 (microphone muted) are turned on, they blink with a frequency of 1 Hz. Multiplex Mode A total of 132 segments are addressable. One output drives 4 segments in a time multiplex mode. The 4 backplane outputs determine the currently addressed segment (see figure 3). Figure 3 gives the correlation between segment outputs and addressed segments. Data and Commands 32 different words may be received via the serial interface. 19 words are interpreted as display data for one of the 18 seven segment digits. Table 2 gives the translation from received code to displayed symbol. 13 words are valid commands codes. The function of each command is described in table 2, and table 4 lists the 5 bit codes for all possible commands.
Rev. 1
4
Dec. 1993
Data Sheet
Table 2 Command Summary NO 1 2 3 4 5 6 7 8 9 10 11 12 13 MNEMONIC SET LS CLEAR LS SET MUTE CLEAR MUTE SET 2ND CLEAR 2ND SET CLOCK START START COPY START FIFO START TIMER BLANK ALL TEST MODE FUNCTION Turns on special symbol SB0 (loudspeaker on, blinking) Turns off special symbol SB0 Turns on special symbol SB1 (microphone muted, blinking) Turns off special symbol SB1 Turns on special symbol SB2 (2nd function on keyboard) Turns off special symbol SB2 Initiates clock setting; SB5 is turned on Blanks all digits, SB3 and SB4; accepts data, timer not started
AS2590
Blanks all digits and SB4; turns on SB3, accepts data, timer not started (if not already running) Blanks all digits and SB3; turns on SB4, accepts data, timer started (if not already running) Blanks all digits, turns off SB3 and SB4, accepts data, timer started (if not already running) Blanks all digits and all special symbols (except D13, D14, D16, D17 and SB5 when clock is running) Turns circuit into test mode
Table 3 Segment Mapping SEGMENT OUTPUT S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S13 S14 S15 S16 BP0 SB0 D0/F D0/A D1/F D1/A D2/A D3/A D3/B D4/F D4/A D5/F D5/A D6/A D7/A D7/B D8/F D8/A BACKPLANE BP1 BP2 SB1 SB4 D0/G D0/E D0/B D1/G D1/B D2/F D3/F D3/G D4/G D4/B D5/G D5/B D6/F D7/F D7/G D8/G D8/B D0/C D1/E D2/G D2/B D2/E D3/C D4/E D4/C D5/E D6/G D6/B D7/E D7/C D8/E D8/C BP3 SB2 D0/D D1/D D1/C D2/E D2/C D2/D D3/D D4/D D5/D D5/C D6/E D6/C D6/D D7/D D8/D D9/D Dn/m = segment m of digit n SBn = special symbol n SEGMENT OUTPUT S17 S18 S19 S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 BACKPLANE BP1 BP2 D9/G D9/E D9/B D10/G D10/F D11/F D11/G D12/G D12/B D13/G D13/B D14/F D15/F D15/G D16/G D16/B D17/G D17/B D10/B D11/E D11/C D12/E D12/C D13/E D14/G D14/B D15/E SB5 D16/E D16/C D17/E D15/C
BP0 D9/F D9/A D10/A D11/A D11/B D12/F D12/A D13/F D13/A D14/A D15/A D15/B D16/F D16/A D17/F D17/A
BP3 D9/C D10/E D10/C D10/D D11/D D12/D D13/D D13/C D14/E D14/C D14/D D15/D D16/D D17/D D17/C SB3
Rev. 1
5
Dec. 1993
Data Sheet
BP0 Active Backplane BP1 BP2 BP3 VDD V2/3 V1/3 Vss VDD V2/3 V1/3 Vss VDD V2/3 V1/3 Vss VDD V2/3 V1/3 Vss
AS2590
to high transition of the data line while the clock line is high followed by a negative clock pulse indicates a stop condition (see figure 4). Table 4 Codes for Serial Interface NO SYMBOL MSB 1 SB0-on 0 2 SB0-off 0 3 4 5 6 7 8 9 10
VDD V2/3 V1/3 Vss VDD V2/3 V1/3 Vss
BP0
BP1
B3 0 0 0 1 0 1 1 1 1 0 0 1 0 1 0 0 0 0 0 0 1 1 1 0 0 1 1 1 1 1 1 0
B2 1 0 0 0 1 1 0 1 1 0 1 1 1 1 0 1 0 0 1 0 0 1 0 1 1 1 1 0 0 0 0 0
B1 0 1 0 0 1 1 1 0 1 1 0 0 1 0 0 0 1 0 0 1 0 0 1 1 1 1 1 0 1 1 0 0
LSB HEX 1 05 1 03 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 11 09 07 1F 0B 0D 0F 13 15 1D 17 1C 00 04 02 10 14 12 08 0C 0A 06 16 0E 1E 18 1A 1B 19 01
BP2
SB1-on SB1-off SB2-on SB2-off
SET CLOCK
1 0 0 1 0 0 0 1 1 1 1 1 0 0 0 1 1 1 0 0 0 0 1 0 1 1 1 1 1 0
BP3
START COPY FIFO TIMER BLANK TEST 0 1 2 3 4 5 6 7 8 9 a b c d * # - P/T r
S0 on S1 off off off
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
off
on
on
on
Figure 3 LCD driver outputs Serial Interface The serial interface is a one way, two line link between the dialler (AS2574) and the display driver. The two lines are the serial data line (SDA) and the serial clock line (SCL). The display driver can only receive data. Word Transfer: Data are transferred as 5 bit words with start and stop bit. the least significant bit is sent first after the start bit. As long as there is no data transfer, both data and clock lines have to remain high. Also between two words both lines have to stay high for a specified time. Figure 4 shows the timing of the serial interface. Start and Stop Conditions: A start condition is detected when the data line goes from high to low while the clock line is held high. A low
SDA SCL START #1 LSB B0 B1 B2 B3 MSB B4 STOP #1 WORD START GAP #2
Figure 4 Interface Timing
Rev. 1
6
Dec. 1993
Data Sheet
Electrical Characteristics
Absolute Maximum Ratings
AS2590
Positive Supply Voltage ...................................................................................................................-0.3V VDD 7V Input Current ................................................................................................................................................ 25 mA Digital Input Voltage .....................................................................................................VSS - 0.3V VIN VDD + 0.3V Electrostatic Discharge (HBM) ........................................................................................................................500V Storage Temperature ......................................................................................................................-65C to +125C
Recommended Operating Conditions Supply Voltage ..............................................................................................................................2.5V VDD 5.5V Oscillator Frequency ...............................................................................................................................32.768 kHz Operating Temperature ....................................................................................................................- 25C to +70C
DC Characteristics (Default conditions: recommended operating conditions; outputs unloaded; VDD = 3.0V) Symbol Parameter Conditions Test circuit fig. 5 IDD0 IDD VIL VIH VLCD RBIAS Standby Current Operating Current no clock running TAMB = 5 to 55 C Note 1, note 2 Input Voltage, Low Line Voltage, High Output Voltage, Sink ILCD = 4.8 mA 2.2 VSS 0.8 VDD 0.2 VDD VDD 0.4 V V V 30 1.5 50 A A Min Typ Max Units
Oscillator Bias Resistor
M
Note 1: Segment and backplane outputs loaded with maximum 30 pF, power consumption of external voltage divider not included, RBIAS = 2.2 M 10%. Note 2: Xtal parameters: Rimax = 60 k (Rityp = 30 k) Qmin = 35 000 Co = 1.5 pF (capacitance across Xtal terminals) fxtal = 32.768 kHz
Rev. 1
7
Dec. 1993
Data Sheet
AC Characteristics (VDD = 3.0V; TAMB = -25 to 70 C, unless otherwise specified) Symbol SDA/SCL fCL fCLH fCLL fCD fSOH fSOL fHD fSUSO fHSA fGAP BP0...3 tBRON tBFON tBROF tBFOF tBC S0...32 tSRON tSFON tSROF tSFOF tSC tTIMER tXUP Parameter Serial Interface Clock Frequency Clock High Time Clock Low Time Clock Low to Data Change Stop Bit High Time Stop Bit Low Time Data Hold Time Clock Setup for Stop Clock Hold for Start Data High between 2 Words 200 200 200 100 20 50 50 Conditions Fig. 5 10 50 50 tCLL Min Typ Max
AS2590
Units
kHz s s ns s s ns ns ns s
Back Plane Outputs Rise Time, on Fall Time, on Rise Time, off Fall Time, off Cycle Frequency Segment Outputs Rise Time, on Fall Time, on Rise Time, off Fall Time, off Cycle Frequency
Figure 6, note 1 20 20 20 20 128 Figure 7, note 2 20 20 20 20 128 s s s s Hz s s s s Hz
Timer Display Time
Note 3
5
6
sec
Oscillator Startup Time
RBIAS = 2.2 M
300
ms
Note 1: Loads on backplanes = 3 000 pF//10 M Note 2: Loads on segments = 360 pF//1 M Note 3: After BLANK ALL command and timer has been started with a valid start command, timer content is displayed.
Rev. 1
8
Dec. 1993
Data Sheet
Timing Diagrammes
AS2590
tHSA
tCD
tHD
SDA
tCLH tCLL
SCL
START
BIT 0
BIT 1
...
tSUSO
tSOH
tGAP
SDA
tCLL
SCL
tSOL
BIT 4
STOP
Figure 5 Serial Interface timing waveforms
WORD GAP...
Rev. 1
9
Dec. 1993
Data Sheet
Output Waveforms
AS2590
tBC tBRON
VDD 0.9 VDD
tBFON
tBC tBROF tBROF
0.1 VDD Vss
Figure 6 Backplane timing waveforms
tSC tSFON
VDD 0.9 VDD
tSRON tSFOF
tSC tSFOF
0.1 VDD Vss
Figure 7 Segment timing waveforms
Rev. 1
10
Dec. 1993
Data Sheet
Pin Configurations
48 Pin DIP 52 pin PLCC
AS2590
BP1 BP0 S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 V1/3 S10 S11 S12 S13 S14 S15 S16 S17 S18 S19 Vss
1 2 3 4 5 6 7 8 9
48 47 46 45 44 43 42 41 40
VDD MS XTAL2 XTAL1 VBIAS SCL SDA VLCD S20 S21 S22 S23 S24 S25 S26 S27 S28 S29 S30 S31 S32 V2/3 BP2 BP3
S4 S5 S6 S7 S8 S9 V1/3 S10 S11 S12 S13 S14 NC
NC S3 S2 S1 S0 BP0 BP1 VDD MS XTAL2 XTAL1 VBIAS SCL
1 14
AS2590
27
40
AS2590
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
NC SDA VLCD S20 S21 S22 S23 S24 S25 S26 S27 S28 S29
Ordering Information:
48 pin DIP: 52 pin PLCC: AS2590 P AS2590 N
Applications:
For application support contact your local AMS sales offices.
Rev. 1
11
S15 S16 S17 S18 S19 VSS BP3 BP2 V2/3 S32 S31 S30 NC
Dec. 1993
Data Sheet
AS2590
Sales Representative
Devices sold by Austria Mikro Systeme are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Austria Mikro Systeme makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Austria Mikro Systeme reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Austria Mikro Systeme for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by Austria Mikro Systeme for each application. Copyright (c) 1993, Austria Mikro Systeme International AG, Schloss Premstatten, 8141 Unterpremstatten, Austria. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished here by Austria Mikro Systeme is believed to be correct and accurate. However, Austria Mikro Systeme shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Austria Mikro Systeme rendering of technical or other services.
Rev. 1
12
Dec. 1993

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