PCA9538DWR TI I2C GPIO Expander | 16-SOIC | 8-bit, 2.3V-5.5V

Product Overview

The PCA9538DWR from Texas Instruments is a low-voltage 8-bit I²C-bus I/O expander designed for 2.3-V to 5.5-V VCC operation. 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 an 8-bit quasi-bidirectional I/O port (P0–P7) with high-current drive capability (25 mA sink, 10 mA source) and low standby current consumption (1 µA typical). Three hardware address pins (A0, A1, A2) allow up to eight devices on the same bus, expanding the I/O count to 64. The PCA9538DWR is available in a 16-pin SOIC package and is fully specified for operation from -40°C to +85°C.

Detailed Technical Specifications

Key Features

• 8-bit I/O port with polarity inversion register
• Active LOW open-drain interrupt output (INT)
• Three hardware address pins allow up to eight devices on the I²C bus
• Low standby current consumption (1 µA typical)
• High-current drive capability (25 mA sink, 10 mA source)
• I²C to parallel port expander with power-up reset
• No glitch on power-up
• Supports hot insertion
• Low operating current (80 µA typical at 5.5 V, 400 kHz)

Target Applications

• 5G base station: Control and status monitoring of power amplifiers, fans, and LEDs
• Automotive dashboard: Reading switch inputs and controlling indicator LEDs
• Industrial PLC: Expanding digital I/O for sensor and actuator interfaces
• Server/telecom equipment: Monitoring system health (temperature, voltage) via GPIO
• Consumer electronics: Keypad scanning and LED control in smart home devices

Global Supply Chain & Wholesale Solutions

At Jasin Chip, we provide professional supply chain and wholesale solutions for PCA9538DWR. Our core advantages include:

• 24/7 Global Customer Support: Professional team providing instant quotes and technical support worldwide.
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• BOM Kitting & Sampling Services: Specialized sourcing for testing samples and urgent shortage components.

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• 100% Original & Authentic: All components are guaranteed to be authentic with strict quality control.
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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

PCA9538DWR 是德州儀器（TI）推出的一款低電壓 8 位 I²C 匯流排 I/O 擴展器，工作電壓範圍為 2.3 V 至 5.5 V。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 8 位準雙向 I/O 埠（P0–P7），支援大電流驅動能力（25 mA 灌電流，10 mA 拉電流）和低待機電流（典型值 1 µA）。三個硬體位址引腳（A0、A1、A2）允許同一匯流排上最多連接八個器件，將 I/O 數量擴展至 64 個。PCA9538DWR 採用 16 引腳 SOIC 封裝，工作溫度範圍為 -40°C 至 +85°C。

詳細技術參數

核心特性

• 8 位 I/O 埠，帶極性反轉暫存器
• 低電平有效開漏中斷輸出 (INT)
• 三個硬體位址引腳，允許 I²C 匯流排上最多八個器件
• 低待機電流消耗（典型值 1 µA）
• 大電流驅動能力（25 mA 灌電流，10 mA 拉電流）
• I²C 至並行埠擴展器，帶上電復位
• 上電無突波
• 支援熱插入
• 低工作電流（5.5 V、400 kHz 時典型值 80 µA）

典型應用場景

• 5G 基站：控制並監控功率放大器、風扇和 LED 的狀態
• 汽車儀錶板：讀取開關輸入並控制指示燈 LED
• 工業 PLC：擴展數位 I/O 以連接感測器和執行器
• 伺服器/電信設備：通過 GPIO 監控系統健康狀況（溫度、電壓）
• 消費電子：智慧家居設備中的鍵盤掃描和 LED 控制

環球供應鏈與批發合作夥伴方案

在 Jasin Chip，我們為 PCA9538DWR 提供全面的供應鏈與批發解決方案。 我們的核心優勢包括：

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