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PCA9537 4-bit I2C and SMBus low power I/O port with interrupt and reset
Product data sheet Supersedes data of 2004 Sep 30 2004 Nov 29
Philips Semiconductors
Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
DESCRIPTION
The PCA9537 is a 10-pin CMOS device that provide 4 bits of General Purpose parallel Input/Output (GPIO) expansion with interrupt and reset for I2C/SMBus applications and was developed to enhance the Philips family of I@C I/O expanders. I/O expanders provides a simple solution when additional I/O is needed for ACPI power switches, sensors, pushbuttons, LEDs, fans, etc. The PCA9537 consists of a 4-bit Configuration register (Input or Output selection); 4-bit Input register, 4-bit Output register and a 4-bit Polarity inversion register (Active-HIGH or Active-LOW operation). The system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each Input or Output is kept in the corresponding Input or Output register. The polarity of the input port register can be inverted with the Polarity Inversion Register. All registers can be read by the system master. The PCA9537 open-drain interrupt output is activated when any input state differs from its corresponding input port register state and is used to indicate to the system master that an input state has changed. The power-on reset sets the registers to their default values and initializes the device state machine. The RESET pin causes the same reset/initialization to occur without depowering the device. The I2C address is fixed and allows only one device on the same I2C/SMBus.
FEATURES
* 4-bit I2C GPIO with interrupt and reset * Operating power supply voltage range of 2.3 to 5.5 V * 5 V tolerant I/Os * Polarity inversion register * Active LOW interrupt output * Active LOW reset input * Low stand-by current * Noise filter on SCL/SDA inputs * No glitch on power-up * Internal power-on reset * 4 I/O pins which default to 4 inputs * 0 kHz to 400 kHz clock frequency * ESD protection exceeds 2000 V HBM per JESD22-A114, * Latch-up testing is done to JEDEC Standard JESD78 which * Offered in TSSOP10 package
ORDERING INFORMATION
PACKAGES 10-Pin Plastic TSSOP TEMPERATURE RANGE -40 C to +85 C exceeds 100 mA 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
ORDER CODE PCA9537DP
TOPSIDE MARK 9537
DRAWING NUMBER SOT552-1
Standard packing quantities and other packing data are available at www.standardproducts.philips.com/packaging. I2C is a trademark of Philips Semiconductors Corporation. SMBus as specified by the Smart Battery System Implementers Forum is a derivative of the Philips I2C patent.
2004 Nov 29
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
PIN CONFIGURATION
I/O0 1 I/O1 2 I/O2 3 I/O3 4 VSS 5 10 VDD 9 8 7 SDA SCL INT
6 RESET
SW02182
Figure 1. Pin configuration
PIN DESCRIPTION
PIN NUMBER 1-4 5 6 7 8 9 10 SYMBOL I/O0-3 VSS RESET INT SCL SDA VDD FUNCTION I/O0 to I/O3 Supply ground Active LOW reset input Interrupt output (open drain) Serial clock line Serial data line Supply voltage
BLOCK DIAGRAM
PCA9537
SCL SDA I/O0 INPUT FILTER I2C/SMBUS CONTROL 4-BIT INPUT/ OUTPUT PORTS I/O1 I/O2 I/O3
WRITE pulse VDD RESET VSS POWER-ON RESET INT LP FILTER NOTE: ALL I/Os ARE SET TO INPUTS AT RESET READ pulse VCC
SW02183
Figure 2. Block diagram
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
REGISTERS Command Byte
Command 0 1 2 3 Protocol Read byte Read/write byte Read/write byte Read/write byte Function Input port register Output port register Polarity inversion register Configuration register
Power-on Reset
When power is applied to VDD, an internal power-on reset holds the PCA9537 in a reset condition until VDD has reached VPOR. At that point, the reset condition is released and the PCA9537 registers and state machine will initialize to their default states. Thereafter, VDD must lowered below 0.2 V to reset the device. For a power reset cycle, VDD must be lowered below 0.2 V and then restored to the operating voltage.
The command byte is the first byte to follow the address byte during a write transmission. It is used as a pointer to determine which of the following registers will be written or read.
RESET Input
A reset can be accomplished by holding the RESET pin LOW for a minimum of tW. The PCA9537 registers and SMBus/I2C state machine will be held in their default state until the RESET input is once again HIGH. This input requires a pull-up resistor to VDD if no active connection is used.
Register 0 - Input Port Register
bit I7 I6 I5 I4 I3 I2 I1 I0 not used
default
Interrupt Output
1 X X X X The open-drain interrupt output is activated when one of the port pins change state and the pin is configured as an input. The interrupt is deactivated when the input returns to its previous state or the input port register is read. Note that changing an I/O from an output to an input may cause a false interrupt to occur if the state of the pin does not match the contents of the input port register.
1
1
1
This register is a read only port. It reflects the incoming logic levels of the pins, regardless of whether the pin is defined as an input or an output by Register 3. Writes to this register have no effect. The default value `X' is determined by the externally applied logic level.
Register 1 - Output Port Register
bit O7 O6 O5 O4 O3 O2 O1 O0 not used
default
1
1
1
1
1
1
1
1
This register reflects the outgoing logic levels of the pins defined as outputs by Register 3. Bit values in this register have no effect on pins defined as inputs. Reads from this register return the value that is in the flip-flop controlling the output selection, NOT the actual pin value.
Register 2 - Polarity Inversion Register
bit N7 N6 N5 N4 N3 N2 N1 N0 not used
default
0
0
0
0
0
0
0
0
This register allows the user to invert the polarity of the Input Port Register data. If a bit in this register is set (written with `1'), the corresponding Input Port data is inverted. If a bit in this register is cleared (written with a `0'), the Input Port data polarity is retained.
Register 3 - Configuration Register
bit C7 C6 C5 C4 C3 C2 C1 C0 not used
default
1
1
1
1
1
1
1
1
This register configures the directions of the I/O pins. If a bit in this register is set, the corresponding port pin is enabled as an input with high impedance output driver. If a bit in this register is cleared, the corresponding port pin is enabled as an output. At reset, the I/Os are configured as inputs.
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
SIMPLIFIED SCHEMATIC OF I/O0 TO I/O3
DATA FROM SHIFT REGISTER CONFIGURATION REGISTER DATA FROM SHIFT REGISTER D FF WRITE CONFIGURATION PULSE WRITE PULSE CK Q D FF CK Q Q2 I/O0 TO I/O3 Q Q Q1 ESD PROTECTION DIODE OUTPUT PORT REGISTER DATA VDD
OUTPUT PORT REGISTER INPUT PORT REGISTER D FF READ PULSE CK Q Q
ESD PROTECTION DIODE
VSS
INPUT PORT REGISTER DATA
TO INT
DATA FROM SHIFT REGISTER WRITE POLARITY PULSE
D FF CK
Q
POLARITY REGISTER DATA
Q
POLARITY INVERSION REGISTER
SW02325
NOTE: At Power-on Reset, all registers return to default values. Figure 3. Simplified schematic of I/O0 to I/O3
I/O port
When an I/O is configured as an input, FETs Q1 and Q2 are off, creating a high-impedance input. The input voltage may be raised above VDD to a maximum of 5.5 V. If the I/O is configured as an output, then either Q1 or Q2 is enabled, depending on the state of the output port register. Care should be exercised if an external voltage is applied to an I/O configured as an output because of the low-impedance paths that exist between the pin and either VDD or VSS.
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
Device address
SLAVE ADDRESS
1
0
0
1
0
0
1
R/W
FIXED
SW02184
Figure 4. PCA9537 address
Bus transactions
Data is transmitted to the PCA9537 registers using the write mode as shown in Figures 5 and 6. Data is read from the PCA9537 registers using the read mode as shown in Figures 7 and 8. These devices do not implement an auto-increment function so once a command byte has been sent, the register which was addressed will continue to be accessed by reads until a new command byte has been sent.
SCL
1
2
3
4
5
6
7
8
9 command byte
slave address
data to port
SDA
S
1
0
0
1
0
0
1
0 R/W
A
0
0
0
0
0
0
0
1
A acknowledge from slave
DATA 1
A
P
start condition
acknowledge from slave
acknowledge from slave
WRITE TO PORT
DATA OUT FROM PORT tpv
DATA 1 VALID
SW02185
Figure 5. WRITE to output port register
SCL
1
2
3
4
5
6
7
8
9
slave address
command byte
data to register
SDA
S
1
0
0
1
0
0
1
0 R/W
A
0
0
0
0
0
0
1
1/0
A acknowledge from slave
DATA
A
P
start condition
acknowledge from slave
acknowledge from slave
DATA TO REGISTER
SW02186
Figure 6. WRITE to configuration or polarity inversion registers Expanded diagram found on page 13, Figure 16.
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
slave address
acknowledge from slave
acknowledge from slave
slave address
acknowledge from slave
data from register
acknowledge from master
S
1
0
0
1
0
0
1
0 R/W
A
COMMAND BYTE
A
S
1
0
0
1
0
0
1
1 R/W
A
DATA first byte
A
at this moment master-transmitter becomes master-receiver and slave-receiver becomes slave-transmitter data from register no acknowledge from master
DATA last byte
NA
P
SW02187
Figure 7. READ from register
SCL
1
2
3
4
5
6
7
8
9 data from port data from port
slave address
SDA
S
1
0
0
1
0
0
1
1 R/W
A acknowledge from slave
DATA 1
A acknowledge from master
DATA 4
NA
P stop condition
start condition
no acknowledge from master
READ FROM PORT
DATA INTO PORT tph
DATA 2
DATA 3 tps
DATA 4
INT
tiv
tir
SW02188
NOTES: 1. This figure assumes the command byte has previously been programmed with 00h. 2. Transfer of data can be stopped at any moment by a stop condition. Figure 8. READ input port register Expanded diagram found on page 13, Figure 15.
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
TYPICAL APPLICATION
VDD (5 V) VDD SCL SDA MASTER CONTROLLER INT INT I/O2 RESET GND RESET I/O3 RESET 10 k 10 k 10 k 10 k VDD SCL SDA I/O1 INT I/O0 SUBSYSTEM 1 (e.g. temp sensor) 100 k
2 k
PCA9537
VSS A
SUBSYSTEM 2 (e.g. counter)
Controlled Switch (e.g. CBT device) ENABLE B NOTE: Device address is 1001001 for this example I/O0, I/O2, I/O3, configured as outputs I/O1, configured as input
SW02189
Figure 9. Typical application
Minimizing IDD when the I/O is used to control LEDs
When the I/Os are used to control LEDs, they are normally connected to VDD through a resistor as shown in Figure 9. Since the LED acts as a diode, when the LED is off the I/O VIN is about 1.2 V less than VDD. The supply current , IDD, increases as VIN becomes lower than VDD and is specified as IDD in the DC characteristics table. Designs needing to minimize current consumption, such as battery power applications, should consider maintaining the I/O pins greater than or equal to VDD when the LED is off. Figure 10 shows a high value resistor in parallel with the LED. Figure 11 shows VDD less than the LED supply voltage by at least 1.2 V. Both of these methods maintain the I/O VIN at or above VDD and prevents additional supply current consumption when the LED is off.
VDD
3.3 V
5V
LED VDD
100 k VDD LED
I/Ox
I/Ox
SW02326
SW02327
Figure 10. High value resistor in parallel with the LED
Figure 11. Device supplied by a lower voltage
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
ABSOLUTE MAXIMUM RATINGS
In accordance with the Absolute Maximum Rating System (IEC 134) SYMBOL VDD II VI/O II/O IDD ISS Ptot Tstg Tamb TJ(MAX) Supply voltage DC input current DC voltage on an I/O DC output current on an I/O Supply current Supply current Total power dissipation Storage temperature range Operating ambient temperature Maximum junction temperature PARAMETER CONDITIONS MIN -0.5 -- VSS - 0.5 -- -- -- -- -65 -40 -- MAX 6.0 20 5.5 50 85 100 200 +150 +85 +125 UNIT V mA V mA mA mA mW C C C
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
HANDLING
Inputs and outputs are protected against electrostatic discharge in normal handling. However, to be totally safe, it is desirable to take precautions appropriate to handling MOS devices. Advice can be found in Data Handbook IC24 under "Handling MOS devices".
DC CHARACTERISTICS
SYMBOL Supplies VDD IDD Istbl Istbh VPOR VIL VIH IOL IL CI I/Os VIL VIH Supply voltage Supply current Standby current Standby current
VDD = 2.3 to 5.5 V; VSS = 0 V; Tamb = -40 C to +85 C; unless otherwise specified. PARAMETER CONDITIONS MIN 2.3 Operating mode; VDD = 5.5 V; no load; fSCL = 100 kHz Standby mode; VDD = 5.5 V; no load; VI = VSS; fSCL = 0 kHz; I/O = inputs Standby mode; VDD = 5.5 V; no load; VI = VDD; fSCL = 0 kHz; I/O = inputs No load; VI = VDD or VSS -- -- -- -- -0.5 0.7VDD VOL = 0.4 V VI = VDD = VSS VI = VSS 3 -1 -- -0.5 2.0 VOL = 0.5 V; VDD = 2.3 V; Note 2 VOL = 0.7 V; VDD = 2.3 V; Note 2 IO OL LOW-level LOW level output current VOL = 0.5 V; VDD = 4.5 V; Note 2 VOL = 0.7 V; VDD = 4.5 V; Note 2 VOL = 0.5 V; VDD = 3.0 V; Note 2 VOL = 0.7 V; VDD = 3.0 V; Note 2 IOH = -8 mA; VDD = 2.3 V; Note 3 IOH = -10 mA; VDD = 2.3 V; Note 3 VO OH HIGH level output voltage HIGH-level IOH = -8 mA; VDD = 3.0 V; Note 3 IOH = -10 mA; VDD = 3.0 V; Note 3 IOH = -8 mA; VDD = 4.5 V; Note 3 IOH = -10 mA; VDD = 4.5 V; Note 3 IL CI IOL IOH VIL VIH IL Leakage current Input capacitance LOW-level output current HIGH-level output current LOW-level input voltage HIGH-level input voltage Leakage current VI = VDD = VSS VOL = 0.4 V VOL = 0.4 V VI = VDD = VSS 8 10 8 10 8 10 1.8 1.7 2.6 2.5 4.1 4.0 -1 -- 3 -1 -0.5 2.0 -1 TYP -- 104 0.25 0.25 1.5 -- -- 7 -- 5 -- -- 10 13 17 24 14 19 -- -- -- -- -- -- -- 5 13 -- -- -- -- MAX 5.5 175 1 1 1.65 0.3VDD 5.5 -- +1 10 0.8 5.5 -- -- -- -- -- -- -- -- -- -- -- -- 1 10 -- +1 0.8 5.5 1 UNIT V A A A V V V mA A pF V V mA mA mA mA mA mA V V V V V V A pF mA A V V A
Power-on reset voltage (Note 1) LOW-level input voltage HIGH-level input voltage LOW-level output current Leakage current Input capacitance LOW-level input voltage HIGH-level input voltage
Input SCL; input/output SDA
Interrupt INT
Select Input RESET
NOTES: 1. VDD must be lowered to 0.2 V in order to reset part. 2. Each I/O must be externally limited to a maximum of 25 mA and the device must be limited to a maximum current of 100 mA. 3. The total current sourced by all I/Os must be limited to 85 mA.
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
AC SPECIFICATIONS
SYMBOL fSCL tBUF tHD;STA tSU;STA tSU;STO tHD;DAT tVD;ACK tVD;DAT tSU;DAT tLOW tHIGH tF tR tSP Port Timing tPV tPS tPH tIV tIR RESET tW tREC tRESET Reset pulse width Reset recovery time Time to reset 4 0 400 -- -- -- 4 0 400 -- -- -- ns ns ns Output data valid Input data setup time Input data hold time Interrupt valid Interrupt reset -- 100 1 -- -- 200 -- -- 4 4 -- 100 1 -- -- 200 -- -- 4 4 ns ns s s s PARAMETER Operating frequency Bus free time between STOP and START conditions Hold time after (repeated) START condition Repeated START condition setup time Setup time for STOP condition Data in hold time Valid time for ACK Data setup time Clock LOW period Clock HIGH period Clock/Data fall time Clock/Data rise time Pulse width of spikes that must be suppressed by the input filters condition2 Data out valid time3 STANDARD MODE I2C-bus MIN 0 4.7 4.0 4.7 4.0 0 0.3 300 250 4.7 4.0 -- -- -- MAX 100 -- -- -- -- -- 3.45 -- -- -- -- 300 1000 50 FAST MODE I2C-bus MIN 0 1.3 0.6 0.6 0.6 0 0.1 50 100 1.3 0.6 20 + 0.1 Cb1 20 + 0.1 Cb --
1
UNITS 400 -- -- -- -- -- 0.9 -- -- -- -- 300 300 50 kHz s s s s ns s ns ns s s ns ns ns
MAX
Interrupt Timing
NOTES: 1. Cb = total capacitance of one bus line in pF. 2. tVD;ACK = time for Acknowledgement signal from SCL LOW to SDA (out) LOW. 3. tVD;DAT = minimum time for SDA data out to be valid following SCL LOW.
SDA
tBUF
tLOW
tR
tF
tHD;STA
tSP
SCL
tHD;STA P S tHD;DAT tHIGH tSU;DAT Sr
tSU;STA
tSU;STO P
SU00645
Figure 12. Definition of timing
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
PROTOCOL
START CONDITION (S)
BIT 7 MSB (A7)
BIT 6 (A6)
BIT 1 (A1)
BIT 0 (R/W)
ACKNOWLEDGE (A)
STOP CONDITION (S)
t
SU;STA
t
LOW
t HIGH
1 / f SCL
SCL
t
BUF
tr
t f
SDA
t HD;STA
t
SU;DAT
t
HD;DAT
t
tSU;STO VD;DAT t VD;ACK
SW02328
Figure 13. I2C-bus timing diagram; rise and fall times refer to VIL and VIH
START SCL ACK OR READ CYCLE
SDA
30% tRESET RESET 50% tREC tW tRESET I/Ox 50% 50% 50%
I/O configured as inputs
SW02340
Figure 14. Definition of RESET timing
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
70 % SCL 2 1 0 A P 30 %
SDA tPS tPH
INPUT tIV tIR
50 %
INT
SW02329
Figure 15. Expanded view of Read input port register
70 % SCL 2 1 0 A P 30 %
SDA tPV
OUTPUT
50 %
SW02330
Figure 16. Expanded view of Write to output port register
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
VCC
6.0 V Open RL = 500
VI PULSE GENERATOR RT D.U.T.
VO
CL 50 pF
DEFINITIONS
RL = Load resistor. CL = Load capacitance includes jig and probe capacitance RT = Termination resistance should be equal to the output impedance ZO of the pulse generators.
SW02142
Figure 17. Test circuitry for switching times
From Output Under Test CL = 50 pF
500
2VDD S1 Open GND
500
Load Circuit
TEST tpv
S1 2 VDD
SA00652
Figure 18. Test circuit
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
TSSOP10: plastic thin shrink small outline package; 10 leads, body width 3 mm
SOT552-1
2004 Nov 29
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
REVISION HISTORY
Rev _3 Date 20041129 Description Product data sheet (9397 750 14259). Supersedes data of 2004 Sep 30 (9397 750 14052).
* DC Characteristics table on page 10:
- subsection `I/Os': changed symbol "IIL" to "IL" and parameter from "Input leakage current" to "Leakage current" - subsection `Input SCL; input/output SDA': change IOL(typ) from `tdb' to `7 mA' - subsection `Interrupt INT': added "IOL" characteristic - subsection `Select Input RESET': changed symbol "IIL" to "IL" and parameter from "Input leakage current" to "Leakage current" added condition "VI = VDD = VSS" _2 _1 20040930 20040820 Objective data sheet (9397 750 14052). Supersedes data of 2004 Aug 20 (9397 750 12894). Objective data sheet (9397 750 12894).
Modifications:
2004 Nov 29
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Philips Semiconductors
Product data sheet
4-bit I2C and SMBus low power I/O port with interrupt and reset
PCA9537
Purchase of Philips I2C components conveys a license under the Philips' I2C patent to use the components in the I2C system provided the system conforms to the I2C specifications defined by Philips. This specification can be ordered using the code 9398 393 40011.
Data sheet status
Level
I
Data sheet status [1]
Objective data sheet
Product status [2] [3]
Development
Definitions
This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN).
II
Preliminary data sheet
Qualification
III
Product data sheet
Production
[1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. [3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes in the products--including circuits, standard cells, and/or software--described or contained herein in order to improve design and/or performance. When the product is in full production (status `Production'), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825
(c) Koninklijke Philips Electronics N.V. 2004 All rights reserved. Printed in U.S.A. Date of release: 11-04
For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
Document order number:
9397 750 14259
Philips Semiconductors
2004 Nov 29 17

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