PCA9538PWR TI I2C GPIO Expander | 16-TSSOP | 8-bit, 2.3V-5.5V

Product Overview

The PCA9538PWR from Texas Instruments is a 16-pin, 8-bit I2C-bus and SMBus 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 with high-current drive capability (25 mA sink) 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 capability to 64 lines. The PCA9538PWR also includes an interrupt output (INT) that is activated when any input state differs from its corresponding input port register state, providing a reliable indication to the host controller.

Detailed Technical Specifications

Key Features

• 8-bit I/O expander with I2C/SMBus interface
• Operating voltage range: 2.3 V to 5.5 V
• High sink current: 25 mA per pin
• Low standby current: 1 µA typical
• Three hardware address pins for up to 8 devices
• Interrupt output for input change detection
• Polarity inversion register for input data
• Power-on reset with all registers set to default
• No glitch on power-up
• SCL/SDA input filters for noise suppression
• Package: 16-TSSOP (RoHS compliant)

Target Applications

• 5G base stations: monitoring and control of power modules, fan speeds, and status LEDs
• Automotive dashboard: reading switch inputs (buttons, knobs) and controlling indicator lights
• Industrial PLCs: expanding digital I/O for sensor and actuator interfaces
• Server motherboards: managing system status LEDs, reset buttons, and fan tachometer inputs
• Consumer electronics: keypad scanning and LED control in smart home hubs

Global Supply Chain & Wholesale Solutions

At Jasin Chip, we provide professional supply chain and wholesale solutions for PCA9538PWR. Our core advantages include:

• 24/7 Global Customer Support: Professional team providing instant quotes and technical support worldwide.
• In-stock Inventory, Same-day Shipping: We maintain localized stock; orders confirmed before 4 PM are shipped the same day.
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• Escrow Secured Transactions: We support Escrow.com for secure transactions, ensuring peace of mind for batch orders.
• BOM Kitting & Sampling Services: Specialized sourcing for testing samples and urgent shortage components.

Quality Assurance & Compliance

Jasin Chip guarantees that all delivered products are 100% original factory stock with full quality assurance and traceability.

• 100% Original & Authentic: All components are guaranteed to be authentic with strict quality control.
• RoHS Compliant: All electronic components comply with international environmental and safety standards.
• Original Factory Packaging: We maintain original factory packaging and seals to ensure ESD protection and physical integrity.

產品概述

PCA9538PWR 是德州儀器 (TI) 的一款 16 引腳、8 位 I2C 匯流排和 SMBus I/O 擴展器，工作電壓範圍為 2.3 V 至 5.5 V。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 8 位準雙向 I/O 端口，具有高電流驅動能力（25 mA 灌電流）和低待機電流消耗（典型值 1 µA）。三個硬體地址引腳（A0、A1、A2）允許同一匯流排上最多八個器件，將 I/O 能力擴展到 64 條線路。PCA9538PWR 還包括一個中斷輸出 (INT)，當任何輸入狀態與其對應的輸入端口寄存器狀態不同時觸發，為主控制器提供可靠的指示。

詳細技術參數

核心特性

• 8 位 I/O 擴展器，帶 I2C/SMBus 接口
• 工作電壓範圍：2.3 V 至 5.5 V
• 高灌電流：每引腳 25 mA
• 低待機電流：典型值 1 µA
• 三個硬體地址引腳，支持最多 8 個器件
• 中斷輸出，用於輸入變化檢測
• 極性反轉寄存器，用於輸入數據
• 上電復位，所有寄存器設置為默認值
• 上電無毛刺
• SCL/SDA 輸入濾波器，用於噪聲抑制
• 封裝：16-TSSOP（符合 RoHS）

典型應用場景

• 5G 基站：監控和控制電源模塊、風扇速度和狀態 LED
• 汽車儀表板：讀取開關輸入（按鈕、旋鈕）並控制指示燈
• 工業 PLC：擴展數字 I/O，用於傳感器和執行器接口
• 服務器主板：管理系統狀態 LED、復位按鈕和風扇轉速計輸入
• 消費電子：智能家居中樞的鍵盤掃描和 LED 控制

環球供應鏈與批發合作夥伴方案

在 Jasin Chip，我們為 PCA9538PWR 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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