NXP Semiconductors – PCAL9535A 16-bit I/O expander provides I2C and SMBus interfaces


I/0 Expander

NXP Semiconductors’ PCAL9535A is a low-voltage 16-bit I/O expander with Interrupt and Reset capabilities. It can interface to either an I2C bus or SMBus.

NXP I/O expanders provide a simple solution when additional I/Os are needed while keeping interconnections to a minimum, and are commonly used in power switches, sensors, push-buttons, LEDs and fan-control applications.

Advanced I/O features in the PCAL9535A include programmable output-drive strength, latchable inputs, programmable pull-up/pull-down resistors, maskable interrupt, interrupt status register, and programmable open-drain or push-pull outputs.

  • 25mA sink capability for directly driving LEDs
  • Power-on reset
  • Up to eight devices can share the same bus


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