TCA1116RTWR

Overview

The TCA1116RTWR is a low-voltage 16-bit I2C I/O expander designed for operation with VCC ranging from 1.65 V to 5.5 V. It provides general-purpose remote I/O expansion via the two-line bidirectional bus, supporting up to 400-kHz Fast I2C communication. The device features an active-low reset input and an open-drain active-low interrupt output that signals when any input state differs from its corresponding Input Port register. It includes polarity inversion registers and supports partial power down, maintaining 5-V tolerance on SDA and SCL lines even when VCC is 0 V. The component utilizes a WQFN (RTW) package.

Feature Summary

• Supports partial power down allowing SDA and SCL lines to remain 5-V tolerant even when VCC is 0 V
• Features high-current push-pull outputs capable of directly driving LEDs
• Includes configurable hardware pins to program up to four different I2C addresses
• Provides an active-low reset input for system initialization without depowering the device

Applications

• Microcontroller families requiring general-purpose remote I/O expansion
• Systems utilizing direct LED driving through high-current push-pull outputs
• Applications requiring interrupt-driven input state monitoring via microcontroller interrupt inputs

Procurement Notes

Verify the specific RTW package variant against the official datasheet specifications before procurement. Confirm that the operating voltage range aligns with the 1.65 V to 5.5 V requirement. Ensure design compatibility with the 400-kHz Fast I2C bus speed and check that the exposed center pad connection meets secondary ground or electrical open requirements as specified in the documentation.

Selection Notes

Select this component when a 16-bit I/O expansion solution is required within a low-voltage environment. Consider the device if the application demands 5-V tolerant inputs while operating at lower core voltages. Evaluate the need for hardware-configurable I2C addressing and the utility of the dedicated interrupt output for efficient microcontroller polling reduction.

Part Context

The TCA1116 series consists of 16-bit I/O expanders for the I2C bus. The TCA1116RTWR specifically denotes the version packaged in a WQFN format. This family allows system masters to configure I/O ports as inputs or outputs and read/write data through corresponding registers. The device initializes I/Os as inputs at power-on and supports polarity inversion for flexible logic level handling.

Replacement Considerations

TCA1116PWR: Same functional specifications but housed in a TSSOP (PW) package instead of WQFN.