SCPS233E March 2012 – February 2017 TCA9554
The TCA9554 is a 16-pin device that provides 8 bits of general purpose parallel input and output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol. The device can operate with a power supply voltage ranging from 1.65 V to 5.5 V. The device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O expanders such as the TCA9554 provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and other similar devices.
The features of the TCA9554 include an interrupt that is generated on the INT pin whenever an input port changes state. The A0, A1, and A2 hardware selectable address pins allow up to eight TCA9554 devices on the same I2C bus. The device can also be reset to its default sate by cycling the power supply and causing a power-on reset.
|PART NUMBER||PACKAGE||BODY SIZE (NOM)|
|TCA9554||TSSOP (16)||5.00 mm × 4.40 mm|
|SSOP (16)||4.90 mm × 3.90 mm|
|SSOP (16)||6.20 mm × 5.30 mm|
|SOIC (16)||7.50 mm × 10.30 mm|