TCA9555PWR TI I2C I/O Expander | 24-TSSOP | 16-bit, 2.3V-5.5V

Product Overview

The TCA9555PWR from Texas Instruments is a 16-bit I2C-bus and SMBus I/O expander with interrupt output and configuration registers. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface (serial clock (SCL) and serial data (SDA)). The device features a 16-bit bidirectional I/O port (P07–P00, P17–P10) that can be configured as inputs or outputs via the I/O direction registers. When the I/O pins are configured as inputs, the TCA9555PWR can monitor the logic state of external devices and generate an interrupt on the INT pin when a change occurs. The device operates from a 2.3-V to 5.5-V supply and is available in a 24-pin TSSOP package.

Detailed Technical Specifications

Key Features

• 16-bit bidirectional I/O port with interrupt function
• I2C bus interface with up to 1 MHz fast mode
• Operating supply voltage range: 2.3 V to 5.5 V
• Low standby current consumption
• Open-drain interrupt output (active-low)
• 5 V tolerant I/Os
• Polarity inversion register
• Internal power-on reset
• No glitch on power-up
• Supports hot insertion
• Low-pass filter on SCL/SDA for noise suppression

Target Applications

• 5G base station: monitoring and control of power amplifiers, fan speed, and status LEDs
• Automotive dashboard: reading switch inputs (buttons, knobs) and controlling indicator lights
• Industrial PLC: expanding digital I/O for sensor and actuator control
• Server and networking equipment: managing system status, reset signals, and configuration pins
• Consumer electronics: keypad scanning, GPIO expansion for microcontrollers with limited pins

Global Supply Chain & Wholesale Solutions

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• Original Factory Packaging: We maintain original factory packaging and seals to ensure ESD protection and physical integrity.

產品概述

TCA9555PWR 是德州儀器 (TI) 推出的一款 16 位 I2C 匯流排和 SMBus I/O 擴展器，具有中斷輸出和配置寄存器。它通過 I2C 介面（串列時鐘 SCL 和串列資料 SDA）為大多數微控制器系列提供通用遠端 I/O 擴展。該器件具有一個 16 位雙向 I/O 埠（P07–P00、P17–P10），可通過 I/O 方向寄存器配置為輸入或輸出。當 I/O 引腳配置為輸入時，TCA9555PWR 可以監控外部設備的邏輯狀態，並在發生變化時在 INT 引腳上產生中斷。該器件的工作電源電壓範圍為 2.3 V 至 5.5 V，採用 24 引腳 TSSOP 封裝。

詳細技術參數

核心特性

• 16 位雙向 I/O 埠，帶中斷功能
• I2C 匯流排介面，支援高達 1 MHz 快速模式
• 工作電源電壓範圍：2.3 V 至 5.5 V
• 低待機電流消耗
• 開漏中斷輸出（低電平有效）
• 5 V 耐壓 I/O
• 極性反轉寄存器
• 內部上電復位
• 上電無毛刺
• 支援熱插入
• SCL/SDA 上的低通濾波器，用於抑制噪聲

典型應用場景

• 5G 基站：監控和控制功率放大器、風扇轉速及狀態 LED
• 汽車儀錶板：讀取開關輸入（按鈕、旋鈕）並控制指示燈
• 工業 PLC：擴展數位 I/O 用於感測器和執行器控制
• 伺服器和網路設備：管理系統狀態、重置信號和配置引腳
• 消費電子：鍵盤掃描、為引腳有限的微控制器提供 GPIO 擴展

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