PCA8550D TI I2C GPIO Expander | 16-SO | 16-bit, 2.3V-5.5V

Product Overview

The PCA8550D from Texas Instruments is a 16-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 interrupt output (INT) that can be connected to the interrupt logic of the microcontroller, sending a signal when an input port changes state. The PCA8550D is available in a 16-pin SOIC package (16-SO) and is fully compatible with the PCA9555 and PCA9555A devices.

Detailed Technical Specifications

Key Features

• 16-bit bidirectional I/O ports
• I2C-bus to parallel port expander
• Open-drain active-low interrupt output
• Low standby current consumption
• 5 V tolerant I/Os
• 400-kHz fast-mode I2C bus
• Three hardware address pins allow up to eight devices on the same bus
• Polarity inversion register
• Internal power-on reset
• No glitch on power-up
• SCL/SDA input filters provide noise immunity

Target Applications

• 5G base station: control and status monitoring of power modules, fans, and alarms
• Automotive dashboard: reading switch inputs (buttons, knobs) and controlling LEDs
• Industrial PLC: expanding digital I/O for sensor and actuator interfaces
• Server/telecom equipment: managing reset signals, status LEDs, and configuration straps
• Consumer electronics: keypad scanning and GPIO expansion in smart home hubs

Global Supply Chain & Wholesale Solutions

At Jasin Chip, we provide professional supply chain and wholesale solutions for PCA8550D. Our core advantages include:

• 24/7 Global Customer Support: Professional team providing instant quotes and technical support worldwide.
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• HK-SZ Synergy, Flexible Settlement: Direct global shipping from Shenzhen with support for HK bank transfers and multi-currency.
• 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.

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• 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

PCA8550D 是德州儀器 (TI) 的一款 16 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 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。該器件具有中斷輸出 (INT)，可連接到微控制器的中斷邏輯，當輸入埠狀態發生變化時發送信號。PCA8550D 採用 16 引腳 SOIC 封裝 (16-SO)，與 PCA9555 和 PCA9555A 器件完全相容。

詳細技術參數

核心特性

• 16 位雙向 I/O 埠
• I2C 匯流排到並行埠擴展器
• 開漏低電平有效中斷輸出
• 低待機電流消耗
• 5 V 容限 I/O
• 400 kHz 快速模式 I2C 匯流排
• 三個硬體位址引腳允許同一匯流排上最多八個器件
• 極性反轉暫存器
• 內部上電復位
• 上電無突波
• SCL/SDA 輸入濾波器提供抗雜訊能力

典型應用場景

• 5G 基站：電源模組、風扇和警報的控制與狀態監控
• 汽車儀錶板：讀取開關輸入（按鈕、旋鈕）並控制 LED
• 工業 PLC：擴展感測器和執行器介面的數位 I/O
• 伺服器/電信設備：管理復位信號、狀態 LED 和配置跳線
• 消費電子：智慧家庭中樞中的鍵盤掃描和 GPIO 擴展

環球供應鏈與批發合作夥伴方案

在 Jasin Chip，我們為 PCA8550D 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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