Remote 4-Bit I²C and SMBus I/O expander with configuration register, interrupt and reset

The TCA9537 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.

The TCA9537

open-drain interrupt output (INT) 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 TCA9537 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 , or with the use of the RESET

pin.

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