PCA9538 8-bit I2C-bus And SMBus Low Power I/O Port With Interrupt And Reset

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
By NXP Semiconductors
PCA9538 's PackagesPCA9538 's pdf datasheet

PCA9538 pdf datasheet download

PCA9538 Pinout, Pinouts
PCA9538 pinout,Pin out
This is one package pinout of PCA9538,If you need more pinouts please download PCA9538's pdf datasheet.

PCA9538 Application circuits
PCA9538 circuits
This is one application circuit of PCA9538,If you need more circuits,please download PCA9538's pdf datasheet.

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