General description
The PCA9535A is a low-voltage 16-bit General Purpose Input/Output (GPIO) expander with interrupt and reset for I2C-bus/SMBus applications. NXP I/O expanders provide a simple solution when additional I/Os are needed while keeping interconnections to a minimum, for example, in ACPI power switches, sensors, push buttons, LEDs, fan control, etc.
In addition to providing a flexible set of GPIOs, the wide VDD range of 1.65 V to 5.5 V allows the PCA9535A to interface with next-generation microprocessors and microcontrollers where supply levels are dropping down to conserve power.
The PCA9535A contains the PCA9535 register set of four pairs of 8-bit Configuration, Input, Output, and Polarity Inversion registers.
The PCA9535A is a pin-to-pin replacement to the PCA9535 and other industry-standard devices. A more fully featured device, the PCAL9535A, is available with Agile I/O features. See the respective data sheet for more details.
The PCA9535A open-drain interrupt (INT) 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.
INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C-bus. Thus, the PCA9535A can remain a simple slave device.
The device outputs have 25 mA sink capabilities for directly driving LEDs while consuming low device current.
The power-on reset sets the registers to their default values and initializes the device state machine.
Three hardware pins (A0, A1, A2) select the fixed I2C-bus address and allow up to eight devices to share the same I2C-bus/SMBus.

FEATUREs and benefits
■ I2C-bus to parallel port expander
■ Pin and function compatible with PCA9535
■ Operating power supply voltage range of 1.65 V to 5.5 V
■ Low standby current consumption:
   ◆ 1.5 μA (typical at 5 V VDD)
   ◆ 1.0 μA (typical at 3.3 V VDD)
■ Schmitt-trigger action allows slow input transition and better switching noise immunity
   at the SCL and SDA inputs
   ◆ Vhys = 0.10  VDD (typical)
■ 5 V tolerant I/Os
■ Open-drain active LOW interrupt output (INT)
■ 400 kHz Fast-mode I2C-bus
■ Internal power-on reset
■ Power-up with all channels configured as inputs
■ No glitch on power-up
■ Latched outputs with 25 mA drive maximum capability for directly driving LEDs
■ Latch-up performance exceeds 100 mA per JESD78, Class II
■ ESD protection exceeds JESD22
   ◆ 2000 V Human Body Model (A114-A)
   ◆ 1000 V Charged-Device Model (C101)
■ Packages offered: TSSOP24, HWQFN24