The PCA9539PW is a 16-bit I²C-bus and SMBus low power I/O port with interrupt and reset developed to enhance the NXP Semiconductors family of I²C-bus I/O expanders. The I/O expander provides a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, etc. It consists of two 8-bit configuration (input or output selection), input, output and polarity inversion (active HIGH or active LOW operation) registers. 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 read register can be inverted with the Polarity inversion register. All registers can be read by the system master. It is identical to the PCA9555 except for the removal of the internal I/O pull-up resistor.
● Polarity inversion register
● Active low interrupt output
● Active low reset input
● Low standby current consumption
● Noise filter on SCL/SDA input
● No glitch on power-up
● Internal power-ON reset
● Latch-up testing is done to JEDEC standard JESD78 which exceeds 100mA
