TCA1116PWR

Overview

The TCA1116PWR 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 supports the Fast I2C bus at 400 kHz and allows up to four devices on the same bus via hardware address pins A0 and A1. The device features an active-low interrupt output, an active-low reset input, and polarity inversion registers. Its outputs provide high-current drive capability for direct LED driving, while inputs remain 5V tolerant with leakage below 1 µA even when VCC is 0 V. Standby current consumption is maximized at 3 µA.

Feature Summary

• Supports partial power down modes where SDA and SCL lines remain functional
• Provides configurable input/output selection through dedicated configuration registers
• Includes an open-drain active-low interrupt output for state change notification
• Features high-current push-pull outputs capable of directly driving LEDs

Applications

• Microcontroller system I/O expansion
• LED indicator control circuits
• Partial power-down peripheral management
• Industrial and consumer electronic interface modules

Procurement Notes

Verify the specific package variant during acquisition, as the TCA1116 series includes both the PW (TSSOP) and RTW (QFN) options. Confirm that the ordered part matches the required pin count and thermal pad configuration. Ensure the supplier provides documentation confirming RoHS compliance and lead finish specifications. Cross-reference the ordering suffix with the manufacturer's latest Package Option Addendum to guarantee compatibility with intended assembly processes.

Selection Notes

Select this component when designing systems requiring remote I/O expansion over the I2C bus within the 1.65 V to 5.5 V supply range. It is suitable for applications needing 5V-tolerant inputs despite lower logic voltages or zero-power states. Consider the interrupt and reset functionalities if asynchronous event handling or system recovery mechanisms are required. Evaluate the package type based on available board space and thermal dissipation requirements.

Part Context

The TCA1116 belongs to Texas Instruments' family of low-voltage I2C I/O expanders. It shares architectural similarities with parts like the TCA6416 and TCA9539, offering comparable register structures and functionality. These devices are commonly used in embedded systems to extend microcontroller capabilities without consuming additional GPIO pins. The TCA1116 specifically emphasizes low standby current and robust ESD protection characteristics.

Replacement Considerations

Direct substitutes include the TCA6416 and TCA9539, which offer similar 16-bit I2C expansion capabilities. Verify pinout compatibility and register mapping before swapping components. Ensure that voltage tolerances and current drive specifications meet the original design requirements when considering alternative devices.