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.
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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.
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