1 Features

• I2C to GPIO expander

• Operating power-supply voltage range of 1.65 V to

5.5 V

• 5-V Tolerant I/O ports

• Software Reset via I2C General Call

• Software-enabled integrated pull-up resistors on P

ports

• P3 can be repurposed as INT output

• 1-MHz Fast mode plus I2C bus

• Input and output configuration register

• Polarity inversion register

• Internal power-on reset

• Power-up with all channels configured as inputs

• Noise filter on SCL and SDA inputs

• Latched outputs with high-current drive maximum

capability for directly driving LEDs

• ESD protection exceeds JESD 22

– 2000-V Human-body model (A114-A)

– 1000-V Charged-device model (C101)

2 Applications

• Personal electronics

– Wearables

– Mobile phones

– Gaming consoles

• Servers

• Routers

3 Description

The TCA9536 is a 4-bit I/O expander for the I2C bus

and is designed for 1.65-V to 5.5-V VCC operation.

It provides general-purpose remote I/O expansion for

most microcontroller families via the I2C interface.

The system controller can enable the I/Os as either

inputs or outputs by writing to the I/O configuration

register 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. There is an additional

special function register that can be used to disable

the internal pull-up resistors and P3 override to an INT

output.

The TCA9536 open-drain interrupt output (when

P3 is configured as INT in the special function

register) is activated when any input differs from its

corresponding Input Port register state and is used to

indicate to the system controller that an input state

has changed.

The system processor can reset the TCA9536 in the

event of a timeout or other improper operation by

using an I2C soft reset command, which puts the

registers in their default state.