TI TCA9555RTWR

This 16-bit 1/O expander for the two-line bidirectional bus (I²C) 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 TCA9555 consists of two 8-bit Configuration (input or output selection), Input Port, Output Port, and Polarity Inversion (active high or active low operation) registers. At power on, the I/Os are configured as inputs. The system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration 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. The TCA9555 is identical to the TCA9535, except for the inclusion of the internal 1/O pull-up resistor, which pulls the 1/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.

• Low Standby-Current Consumption of 3.5 μA Maximum
• I²C to Parallel Port Expander
• Open-Drain Active-Low Interrupt Output
• 5-V Tolerant I/O Ports Compatible With Most Microcontrollers
• 400-kHz Fast I²C Bus
• Configurable Slave Address with 3 Address Pins
• Polarity Inversion Register
• Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• ESD Protection Exceeds JESD 22 2000-V Human-Body Model (A114-A)
• 1000-V Charged-Device Model (C101)

• Servers
• Routers (Telecom Switching Equipment)
• Personal Computers
• Personal Electronics
• Industrial Automation Equipment
• Products with GPIO-Limited Processors