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PCA9538
Datasheet
General description
The PCA9538 is a 16-pin CMOS device that provide 8 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 I2C 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 PCA9538 consists of an 8-bit Configuration register (Input or Output selection); 8-bit Input register, 8-bit Output register and an 8-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 PCA9538 is identical to the PCA9554 except for the removal of the internal I/O pull-up resistor which greatly reduces power consumption when the I/Os are held LOW, replacement of A2 with RESET and different address range.
The PCA9538 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.
Two hardware pins (A0 and A1) vary the fixed I2 address and allow up to four devices to share the same I2C/SMBus.
Features
- 8-bit I2C GPIO with interrupt and reset
- Operating power supply voltage range of 2.3 V 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
- 8 I/O pins which default to 8 inputs
- 0 kHz to 400 kHz clock frequency
- ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
- Latch-up testing is done to JESDEC Standard JESD78 which exceeds 100 mA
- Offered in three different packages: SO16, TSSOP16, and HVQFN16
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| PCA9538BS | PCA9538BS-T | 9352 774 17118 | Volume production | SOT629-1
(HVQFN16) | Reel Pack, SMD, 13" | Standard Marking | PCA9538BS
| Always Pb-free |
| PCA9538D | PCA9538D | 9352 774 18112 | Volume production | SOT162-1
(SO16) | Tube | Standard Marking | PCA9538D
| week 13, 2005 |
| PCA9538D | PCA9538D-T | 9352 774 18118 | Volume production | SOT162-1
(SO16) | Reel Pack, SMD, 13" | Standard Marking | PCA9538D
| week 13, 2005 |
| PCA9538PW | PCA9538PW | 9352 774 19112 | Volume production | SOT403-1
(TSSOP16) | Tube | Standard Marking | PCA9538PW
| week 13, 2005 |
| PCA9538PW | PCA9538PW-T | 9352 774 19118 | Volume production | SOT403-1
(TSSOP16) | Reel Pack, SMD, 13" | Standard Marking | PCA9538PW
| week 13, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| PCA9538BS | 9352 774 17118 | 1.2000 | Order samples | |||||
| PCA9538D | 9352 774 18112 | 1.2000 | not available | |||||
| PCA9538D | 9352 774 18118 | 1.2000 | Order samples | |||||
| PCA9538PW | 9352 774 19112 | 1.2000 | Order samples | |||||
| PCA9538PW | 9352 774 19118 | 1.2000 | not available |
Applications
Related applications
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PDA - discretes focus
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Intelligent washing machine
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Cellular phone - MMS functionality
LCD TV - MMS functionality
Set-top box - MMS functionality
Technical documents
Application Notes
AN469_2;
I2C/SMBus general purpose I/O expanders (20-Jan-05)
Support Documents
75016543;
An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances (2008-06-01)
75013239;
I 2 C Logic Selection Guide (2005-01-12)
75011212;
I2C 2002-1A Evaluation Board Kit (01-Mar-03)
UM10204_3;
I2C-bus specification and user manual (26-Jun-07)
75016535;
NXP 4/8/16-bit I (2008-08-01)
75016189;
NXP I (2008-06-01)
75015045;
World News 14.2 (2005-05-25)
Parametrics/similar products
| Type number | Package | INTERRUPT | Operating temp.(Cel) | # of Bits | Source Current per bit(mA) | I²C-bus(kHz) | Operating voltage(VDC) | Weak Pull-Up Current Source | Max Sink Current per bit(mA) | # of Addresses | Max Sink Current per package(mA) | Reset input pin |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PCA9538BS | SOT629-1
(HVQFN16) | 0-1 | -40~85 | 8 | 10 | 400 | 2.3~5.5 | no internal pull up resistor | 25 | 4 | 100 | Yes |
| PCA9538D | SOT162-1
(SO16) | 0-1 | -40~85 | 8 | 10 | 400 | 2.3~5.5 | no internal pull up resistor | 25 | 4 | 100 | Yes |
| PCA9538PW | SOT403-1
(TSSOP16) | 0-1 | -40~85 | 8 | 10 | 400 | 2.3~5.5 | no internal pull up resistor | 25 | 4 | 100 | Yes |
Similar products
PCA9538 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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