1 Features
• I2C to GPIO expander
• Operating power-supply voltage range of 1.65V to
5.5V
• 5V 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
• 1MHz 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
– 2000V Human body model (Q100-002)
– 1000V Charged-device model (Q100-011)

2 Applications
• Automotive infotainment and cluster
• Body electronics and lighting
• Hybrid, electric and powertrain systems
• Industrial transportation
• Products with GPIO-limited processors

3 Description
The TCA9536-Q1 is a 4-bit I/O expander for the I2C
bus and is designed for 1.65V to 5.5V 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-Q1 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-Q1 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.