TCA8424RHAR TI I2C/SMBus Interface | 40-VQFN (6x6) | 24-bit, 1.65-5.5V

Product Overview

The TCA8424RHAR from Texas Instruments is a 24-bit I2C and SMBus I/O expander with interrupt output, reset, 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 24-bit bidirectional I/O port (P0 to P23) that can be configured as inputs or outputs. The TCA8424RHAR operates from a supply voltage range of 1.65 V to 5.5 V, making it suitable for low-voltage applications. It supports standard (100 kHz), fast (400 kHz), and high-speed (1 MHz) I2C modes. The device is available in a 40-pin VQFN package (6 mm x 6 mm) with a 0.5 mm pitch.

Detailed Technical Specifications

Key Features

• 24-bit bidirectional I/O port with configurable input/output
• I2C and SMBus compatible interface
• Three hardware address pins (A0, A1, A2) allow up to 8 devices on the same bus
• Interrupt output for event-driven communication
• Reset input for initialization
• Internal power-on reset (POR) and noise filter on SCL/SDA
• Low standby current consumption
• Supports hot insertion
• Available in a compact 40-VQFN package

Target Applications

• 5G base stations: for monitoring and controlling power amplifiers, fans, and status LEDs
• Automotive dashboard: for reading switch inputs and controlling indicator lights
• Industrial PLCs: for expanding digital I/O capacity
• Server motherboards: for managing system health indicators and reset signals
• Consumer electronics: for keypad scanning and GPIO expansion in smart home devices

Global Supply Chain & Wholesale Solutions

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產品概述

TCA8424RHAR 是德州儀器 (TI) 推出的一款 24 位 I2C 和 SMBus I/O 擴展器，具有中斷輸出、復位和配置寄存器。它通過 I2C 接口（串行時鐘 SCL 和串行數據 SDA）為大多數微控制器系列提供通用遠程 I/O 擴展。該器件具有一個 24 位雙向 I/O 端口（P0 至 P23），可配置為輸入或輸出。TCA8424RHAR 的工作電源電壓範圍為 1.65 V 至 5.5 V，適用於低電壓應用。它支持標準 (100 kHz)、快速 (400 kHz) 和高速 (1 MHz) I2C 模式。該器件採用 40 引腳 VQFN 封裝（6 mm x 6 mm），引腳間距 0.5 mm。

詳細技術參數

核心特性

• 24 位雙向 I/O 端口，可配置輸入/輸出
• 兼容 I2C 和 SMBus 接口
• 三個硬件地址引腳 (A0, A1, A2)，同一總線上最多支持 8 個器件
• 中斷輸出，用於事件驅動通信
• 復位輸入，用於初始化
• 內部上電復位 (POR) 和 SCL/SDA 噪聲濾波器
• 低待機電流消耗
• 支持熱插拔
• 採用緊湊的 40-VQFN 封裝

典型應用場景

• 5G 基站：用於監控和控制功率放大器、風扇和狀態 LED
• 汽車儀表板：用於讀取開關輸入和控制指示燈
• 工業 PLC：用於擴展數字 I/O 容量
• 服務器主板：用於管理系統健康指示器和復位信號
• 消費電子：用於智能家居設備中的鍵盤掃描和 GPIO 擴展

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