TCA9555_16 Datasheet, PDF (3/46 Pages) Texas Instruments – Low-Voltage 16-Bit I2C and SMBus I/O Expander with Interrupt Output and Configuration Registers

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TCA9555
SCPS200D – JULY 2009 – REVISED JULY 2016
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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