P0 P1 P2 P3P4 P5 P6 P7A0A1 A2 GNDTCA9554ASDA SCLINTVCCPeripheral DevicesRESET, ENABLE, orcontrol inputsINT or status outputsLEDsI2C or SMBus Master(e.g. Processor)An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.Product FolderSample & BuyTechnical DocumentsTools & SoftwareSupport & CommunityTCA9554ASCPS196D – DECEMBER 2010 – REVISED AUGUST 2015TCA9554A Low Voltage 8-Bit I2C and SMBus Low-Power I/O Expander With Interrupt Output and Configuration Registers1Features3Description•I2C to Parallel Port Expander•Open-Drain Active-Low Interrupt OutputThe TCA9554A is a 16-pin device that provides 8 bits of general purpose parallel input/output (I/O) expansion for the two-line bidirectional I2C bus (or•Operating Power-Supply Voltage Range of 1.65 VSMBus) protocol. The device can operate with ato 5.5 Vpower supply voltage ranging from 1.65 V to 5.5 V.•5-V Tolerant I/O Ports•400-kHz Fast I2C BusThe device supports both 100-kHz (Standard-mode) and 400-kHz (Fast-mode) clock frequencies. I/O expanders such as the TCA9554A provide a simple•Three Hardware Address Pins Allow up to EightsolutionwhenadditionalI/OsareneededforDevices on the I2C/SMBusswitches, sensors, push-buttons, LEDs, fans, and•Input/Output Configuration Registerother similar devices.•Polarity Inversion RegisterThe features of the TCA9554A include an interrupt•Internal Power-On Reset•Low Standby Current Consumptionthat 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 TCA9554A•Power-Up With All Channels Configured as Inputsdevices on the sam...
