TCA6416PW - 16-Bit I2C I/O Expander | Texas Instruments
料号： TCA6416PW ✓ 量产中TCA6416PW 概述
An I2C I/O expander is a type of interface IC and serial port expander that sits between a host processor and external digital lines. Its position in the hierarchy is I2C I/O expander > serial I/O expander > interface IC > semiconductor. The device is useful when a design needs more input, output, or bidirectional GPIO resources than the host controller can provide directly.
Key features include 16 configurable I/O ports, bidirectional voltage-level translation through the 1.65 V to 5.5 V operating range, an interrupt output for change notification, a reset input, and configuration registers. The verified product information identifies the TCA6416 as an I/O expander for general-purpose remote I/O expansion across common microcontroller families using SCL and SDA. The TCA6416PW ordering option is supplied in a 24-pin TSSOP package.
The device communicates through the I2C/SMBus-compatible two-wire interface at up to 400 kHz according to DigiKey's product listing. Configuration registers allow the host software to identify inputs, outputs, and polarity behavior, while the interrupt output provides a way for the host to react to a change on a monitored port. The reset and configuration features support deterministic initialization and power-management sequencing.
Typical uses include industrial control panels, sensor and actuator interfaces, communication equipment, instrumentation, and embedded systems that need additional GPIO lines. It is particularly useful when board area, connector count, or host-controller pin availability is constrained, because sixteen external digital lines are added without dedicating sixteen parallel microcontroller pins.
Designers should confirm the I2C pull-up requirements, address configuration, voltage levels, and reset timing in the manufacturer datasheet. The TSSOP footprint requires careful PCB layout and adequate clearance for the 24-pin package. Firmware should also define input, output, and polarity behavior before enabling interrupt-driven event handling. The manufacturer product page and verified distributor listings provide the primary source for electrical and ordering details.
直接替换替代料： TCA6416PW ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
TCA6416PWR
✅ 直接替换📋 参考替代料（不在目录中）
TCA6416PWG4
✅ 直接替换📋 参考替代料（不在目录中）
TCA6416PWTG4
✅ 直接替换📋 参考替代料（不在目录中）
TCA6416PW 规格参数
| Device Type | 16-bit 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 Bus Frequency | 400 kHz |
| Serial Interface | I2C/SMBus, SCL and SDA |
| Bidirectional Voltage-Level Translation | Supported across 1.65 V to 5.5 V operating range |
| Interrupt Output | 1 interrupt output |
| Reset Input | 1 reset input |
| Configuration Registers | Supported |
| 工作温度范围 | -40 °C to +85 °C |
| 封装 | 24-pin TSSOP |
| Package Width | 4.40 mm |
| 安装类型 | Surface mount |
TCA6416PW 4.40 mm 引脚配置指南
TCA6416PW（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： TCA6416PW.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TCA6416PW 适用于 6 应用s: Industrial Control Panel I/O Expansion, Sensor and Actuator Interface, Communication Equipment Status Interface, Instrumentation and Test Equipment, Embedded GPIO Resource Expansion, Power Supply and System Control.
Industrial Control Panel I/O Expansion
The TCA6416PW fits industrial control-panel designs that need more digital lines than the host controller provides. Its 16 configurable ports can connect discrete inputs, relay-control signals, status indicators, and other panel interfaces through the I2C/SMBus serial bus. The 1.65 V to 5.5 V operating range supports low-voltage logic, while the interrupt output lets the controller respond to relevant input changes without continuously polling every port. The verified operating range of -40 °C to +85 °C is suitable for many industrial environments, although final qualification must address transient immunity, grounding, and system-level EMC requirements. Designers should use the configuration registers to establish input, output, and polarity behavior before enabling interrupts.
推荐
Sensor and Actuator Interface
The TCA6416PW is appropriate for distributed sensor and actuator interfaces where a compact bus connection is preferable to many parallel host pins. Sixteen ports provide a practical channel count for digital sensors, alarm signals, latches, and discrete actuator drivers. Because the device supports 400 kHz I2C operation according to the verified DigiKey listing, it can service multiple registers and nodes efficiently without requiring a high-speed parallel interface. The interrupt feature can signal a detected input transition while the main processor handles filtering, debouncing, or higher-level control. Firmware should establish output states before connecting loads and should account for the reset and startup behavior described in the Texas Instruments datasheet.
推荐
Communication Equipment Status Interface
The TCA6416PW can expand status and control lines in communication equipment while keeping the host serial interface available for protocol traffic. Its 16 digital ports are suitable for module-present indicators, link-status signals, fault flags, equipment enables, and fan or power-control lines. Bidirectional voltage-level translation over the 1.65 V to 5.5 V operating range helps integrate logic domains, although each port's voltage and drive limits must be checked against the actual circuit. The interrupt output is especially useful when a changed input should wake or promptly inform the main processor. For redundant or high-availability systems, the TCA6416 should not be treated as a safety function, and the design should include appropriate reset supervision and fail-state definitions.
推荐
Instrumentation and Test Equipment
The TCA6416PW is useful in instrumentation designs where front-panel switches, lamps, relay controls, and measurement-status indicators can exceed the host processor's available pins. The 24-pin TSSOP package supports compact board layouts, and the I2C interface allows firmware to reconfigure ports according to operating modes. Its interrupt output can reduce unnecessary processor polling when an operator changes a control or a connected circuit raises an event flag. The 400 kHz maximum bus rate permits efficient register access without occupying the parallel GPIO bank. For laboratory instruments, engineers should verify logic thresholds for externally driven signals, provide appropriate protection for long wiring, and define safe states during reset so connected actuators do not receive unintended commands.
推荐
Embedded GPIO Resource Expansion
The TCA6416PW solves GPIO scarcity in compact embedded products by adding 16 digital lines over two serial bus pins instead of a bank of parallel controller connections. The 16-bit port count is suitable for buttons, LEDs, relays, and mode-control signals in space-constrained boards. Low-voltage operation from 1.65 V to 5.5 V allows use with both low-voltage sensors and conventional 5 V logic when signal limits permit. The configuration registers support port setup, while reset gives firmware a defined initialization point. Designers should avoid treating I2C expansion as equivalent to native high-speed GPIO, particularly for precise pulse timing, and should verify that SDA and SCL pull-ups meet the bus rise-time requirements for the actual capacitance and bus length.
推荐
Power Supply and System Control
The TCA6416PW can supervise discrete power-management signals, sequencing enables, fault flags, and system indicators through its 16 configurable ports. Low-voltage operation from 1.65 V to 5.5 V makes the expander suitable for monitoring control signals around modern power rails, while its interrupt line allows the system controller to react to a fault without continuous polling. The reset input supports coordinated initialization of downstream logic, and the configuration registers make it possible to designate lines as inputs or outputs. In a power system, output defaults must be selected deliberately so that an uninitialized or reset expander cannot accidentally enable a load. Engineers should also check drive current, input thresholds, and external pull networks against the final rail and fault conditions because these details were not supplied in the verified search summary.
推荐
推荐产品汇总
工程参考数据： TCA6416PW ——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 | TCA6416PWG4 | TCA6416PWTG4 |
|---|---|---|---|---|
| Package | 24-TSSOP | 24-TSSOP - same | 24-TSSOP - same | 24-TSSOP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| I/O Port Count | 16 | 16 | 16 | 16 |
| Operating Supply Voltage | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V | 1.65 V to 5.5 V |
| Maximum I2C Frequency | 400 kHz | 400 kHz | 400 kHz | 400 kHz |
| Interface | I2C/SMBus | I2C/SMBus | I2C/SMBus | I2C/SMBus |
| Interrupt Output | Yes | Yes | Yes | Yes |
| Reset and Configuration Registers | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
关键差异点
- Sixteen-port expansion in a 24-pin TSSOP （对比 TCA965B)
- Wide low-voltage operating range （对比 TCA6416PWR)
- Interrupt-driven I/O monitoring （对比 TCA6416PWG4)
设计说明
Place the TCA6416PW close to the connector or controlled I/O group it serves to minimize trace length and susceptibility to noise. Keep SCL and SDA away from high-current switching nodes and maintain a continuous ground reference beneath the device. Because the exact lead pitch and land pattern were not supplied in the verified search data, engineers must use the official 24-pin TSSOP drawing and pin table before releasing artwork rather than deriving dimensions from generic package images.
Design the 1.65 V to 5.5 V supply rail so it remains valid during startup, reset, and normal bus activity. The verified sources do not provide the internal current consumption or port drive-current limits, so these values must be taken from the manufacturer datasheet before sizing decoupling or confirming fanout. Firmware should configure port directions before outputs are actively driven, and external pull resistors should prevent unintended enables or transitions while the expander is reset.
Calculate SDA and SCL pull-up values from the actual bus capacitance and the controller's timing specifications rather than copying a generic resistor value. The verified listing supports 400 kHz, but achievable rate and timing margin depend on wiring length, node count, pull-up strength, and capacitance. If the bus must remain active during reset, verify that reset behavior cannot create contention with another device. For longer cables, consider proper buffering or differential I2C rather than increasing pull-up current beyond the device's ratings.
Do not assume that all 16 ports are plain push-pull outputs; consult the datasheet for input thresholds, output drive capability, pull-up or pull-down provisions, and port-polarity behavior. Avoid using the interrupt line as a substitute for a debounced mechanical input, and clear or mask interrupt sources during initialization to prevent repeated service requests. In safety- or reliability-critical systems, provide external reset supervision because the serial expander alone is not a safety-rated monitoring device.
合规信息
The verified search summary does not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. These fields remain unknown rather than being inferred.
