TCA6416PWT - 16-Bit I2C I/O Expander | Texas Instruments
料号： TCA6416PWT ✓ 量产中TCA6416PWT 概述
An I/O expander is an interface IC that sits between a host processor and peripheral GPIO devices. The I2C or SMBus interface carries commands and register data over a compact serial bus, while the parallel port pins provide individually controlled digital connections. In the product hierarchy, the TCA6416PWT is an I/O expander, a serial-interface peripheral controller, and ultimately an integrated circuit used to extend digital input/output capacity.
The device supports operation from 1.65 V to 5.5 V and provides voltage-level translation between the host bus and external GPIO circuitry. According to the Texas Instruments product page, it includes interrupt, reset, and configuration registers. The open-drain interrupt output indicates that an input state differs from the corresponding Input Port register state, allowing the host to avoid continuous polling. The RESET pin initiates the same reset and initialization sequence as power-on reset.
Communication with the TCA6416PWT is supported at I2C/SMBus rates up to 400 kHz. The translated serial interface lets a host operating at one logic level communicate with attached circuitry operating at another voltage level within the device's specified operating range. This is particularly useful in compact industrial, communications, consumer, and embedded-control products where the controller has too few direct GPIO pins.
TCA6416PWT applications include remote push-button panels, LED status indicators, relay-control interfaces, sensor digital outputs, and general board-level GPIO expansion. Designers can configure ports as inputs or outputs through the device registers, read input states, and receive an interrupt when a monitored input changes. The 24-pin TSSOP package is suitable for conventional surface-mount PCB assembly and offers a practical pin count for a 16-port device with serial control and interrupt support.
When laying out the circuit, place the device close to the connector or controlled circuitry reached by the 16 port lines, while keeping the I2C bus routing short and away from high-current switching paths. Confirm pull-up resistor requirements, address configuration, logic thresholds, and the open-drain interrupt connection in the manufacturer datasheet. This page combines the device specifications, sourcing guidance, drop-in alternatives, comparison data, and application-focused engineering guidance for faster component evaluation and PCB planning.
直接替换替代料： TCA6416PWT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： TCA6416PWT （相同外形与封装尺寸） ——差异在于 Configuration Registers, Interrupt Output, Serial Interface.
TCA6416PWR
✅ 直接替换联系询价
查看数据手册 →TCA6416PWT 规格参数
| Product Type | 16-bit translating I2C/SMBus I/O expander |
| Number of I/O Ports | 16 ports |
| Operating Supply Voltage Range | 1.65 V to 5.5 V |
| Maximum I2C/SMBus Bus Frequency | 400 kHz |
| Serial Interface | I2C and SMBus |
| Voltage-Level Translation | Bidirectional |
| Interrupt Output | Open-drain |
| Interrupt Function | Activates when an input differs from its Input Port register state |
| Reset Function | Dedicated RESET input performs device reset and initialization |
| Configuration Registers | Yes |
| 封装 | 24-pin TSSOP |
| Package Body Width | 4.40 mm |
| 安装类型 | Surface mount |
TCA6416PWT 4.40 mm 引脚配置指南
TCA6416PWT（4.40 mm 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： TCA6416PWT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TCA6416PWT 适用于 6 应用s: Remote Push-Button Panel Interface, LED Status and Indicator Control, Industrial Control Signal Interface, Communications Equipment Backplane Control, Sensor Digital-Output Aggregation, Embedded Accessory and Peripheral Control.
Remote Push-Button Panel Interface
The TCA6416PWT fits a remote push-button panel because its 16 ports can consolidate multiple switch inputs without consuming a comparable number of host-controller pins. The device operates from 1.65 V to 5.5 V and supports bidirectional translation, allowing the serial interface and external logic levels to differ within the specified operating range. A host can read the input registers, compare them with stored states, and use the open-drain interrupt output to react when a button changes state. The 400 kHz I2C/SMBus capability supports reasonably responsive polling and event handling. Design the input thresholds, debounce approach, connector protection, and external pull network according to the electrical characteristics in the manufacturer datasheet.
推荐
LED Status and Indicator Control
The TCA6416PWT can control up to 16 LED status indicators through its configurable output ports while keeping the host interface limited to I2C or SMBus. This arrangement is useful in instrumentation, communications equipment, and appliances where LEDs are distributed across a panel or board. The operating range of 1.65 V to 5.5 V supports integration with low-voltage digital systems, while bidirectional translation helps bridge differing logic levels. Engineers should confirm output-drive current, voltage thresholds, and the LED current-limiting arrangement in the manufacturer datasheet. The interrupt function can also support monitoring when selected ports are configured as inputs, although it is primarily intended for input-state changes.
推荐
Industrial Control Signal Interface
The TCA6416PWT is suitable for concentrating digital control and monitoring signals in industrial controller boards that already use an I2C or SMBus. Its 16 ports provide more capacity than a typical 8-bit expander, while the 1.65 V to 5.5 V range supports common low-voltage logic systems and bidirectional level translation. The open-drain interrupt output allows a controller to detect a changed input register state, reducing unnecessary continuous polling. For industrial deployment, verify the operating-temperature rating, ESD performance, connector isolation, and protection requirements. The 24-pin TSSOP package should be placed near the external signal connectors to minimize long parallel traces while keeping sensitive serial routing compact.
推荐
Communications Equipment Backplane Control
The TCA6416PWT can add distributed control lines to communications equipment where a primary processor or network controller has insufficient direct GPIO capacity. The translating I2C/SMBus interface supports connection to a host operating across the device's 1.65 V to 5.5 V range, and the 400 kHz bus rate provides a practical balance between transfer capacity and wiring simplicity. Sixteen ports can monitor module-present signals, status LEDs, reset requests, or configuration controls. The open-drain interrupt output supports event-driven handling when input changes are significant. Designers should use the manufacturer register map to establish debounce and polarity, and should review timing and signal-integrity limits when the I2C bus or port traces extend across a backplane.
推荐
Sensor Digital-Output Aggregation
The TCA6416PWT can aggregate digital alarm, threshold, and status outputs from multiple sensors into a compact host interface. Sixteen configurable ports accommodate more discrete signals than an 8-bit device while avoiding a large pin count on the main controller. Its 1.65 V to 5.5 V operating range and bidirectional translation are useful when sensors operate at a different logic level from the host-side bus circuitry. Inputs can be read through the port registers, and the open-drain interrupt output can notify the host when an input differs from its stored state. Confirm output and input thresholds, leakage behavior, and timing in the manufacturer datasheet before connecting sensors with unusual rise times or long cable runs.
推荐
Embedded Accessory and Peripheral Control
The TCA6416PWT suits embedded accessory boards that need multiple control lines for displays, indicators, switches, or peripheral enables. A host can address the device over I2C or SMBus, configure the 16 ports through registers, and use the 400 kHz interface rate for routine status and control updates. The low-voltage 1.65 V to 5.5 V operating range supports compact embedded systems, while the translating interface provides flexibility between bus and peripheral logic domains. The open-drain interrupt is valuable when accessory activity must be reported promptly. Firmware should define startup states, port directions, and input-change masks, while the PCB should reserve the manufacturer-recommended bypass and pull-up arrangements near the device pins.
推荐
推荐产品汇总
工程参考数据： TCA6416PWT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | TCA6416PWR |
|---|---|---|
| Package | 24-pin TSSOP | 24-pin TSSOP |
| Brand | Texas Instruments | Texas Instruments |
| Number of I/O Ports | 16 | 16 |
| Operating Supply Voltage Range | 1.65 V to 5.5 V | 1.65 V to 5.5 V |
| Maximum Bus Frequency | 400 kHz | 400 kHz |
| Serial Interface | I2C and SMBus | I2C and SMBus |
| Interrupt Output | Open-drain | Open-drain |
| Reset Input | Yes | Yes |
| Configuration Registers | Yes | Yes |
| Orderable Packing Code | PWT | PWR |
关键差异点
- Provides full 16-bit expansion in one serial-interface device （对比 TCA6416PWR)
- Supports translated I2C/SMBus communication （对比 TCA6416PWR)
- Event-driven host notification （对比 TCA6416PWR)
- Orderable packaging options for assembly planning （对比 TCA6416PWR)
设计说明
Place the TCA6416PWT near the connector, indicator, or control circuitry served by its 16 port lines. Shorten parallel port traces where practical, route the I2C/SMBus clock and data as a compact pair, and keep the two-wire interface away from switching nodes and high-current edges. Use the manufacturer pin-description table and recommended decoupling arrangement for the 24-pin TSSOP footprint rather than assigning signals from the generic package outline.
Design the supply path for the full 1.65 V to 5.5 V operating range, including voltage-level translation between the serial bus and external port circuitry. Verify input thresholds, output-drive capability, and current limits for every attached load against the manufacturer datasheet. Place required bypass capacitors close to their designated power pins and provide the applicable pull-up network for the I2C bus and open-drain interrupt output.
Do not assume that a powered or reset expander has automatically configured every port for the intended direction. Firmware should initialize the configuration registers, establish safe output states, and define the interrupt mask before normal operation. Also distinguish reset behavior from power-on initialization: the manufacturer states that asserting RESET causes the same reset and initialization operation without depowering the device.
For slow-changing external inputs, validate debounce, rise-time, and overshoot behavior at the receiving pin rather than assuming the bus protocol protects the device from unsuitable waveforms. If port lines connect through cables or connectors, add protection and isolation appropriate to the environment. Confirm the 400 kHz bus timing margin at the slowest host-controller operating condition and review capacitive loading when the I2C bus branches across a board.
合规信息
Compliance declarations are not stated in the manufacturer page summary or distributor snippets. Confirm the current declarations, qualification status, and material documentation with Texas Instruments before production release.