TCA9555DBR datasheet(3/46 Pages) TI1

Part #	TCA9555DBR

Description	Low-Voltage 16-Bit I2C and SMBus I/O Expander with Interrupt Output and Configuration Registers

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TCA9555

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SCPS200D – JULY 2009 – REVISED JULY 2016

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5 Description (continued)

The TCA9555 is identical to the TCA9535, except for the inclusion of the internal I/O pull-up resistor, which pulls

the I/O to a default high when configured as an input and undriven.

Three hardware pins (A0, A1, and A2) are used to program the I2C address, which allows up to eight TCA9555

devices to share the same I2C bus or SMBus. The fixed I2C address of the TCA9555 is the same as the

PCF8575, PCF8575C, and PCF8574, allowing up to eight of these devices in any combination to share the same

I2C bus or SMBus.

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