PCA9557DBR TI I2C I/O Expander | 16-SSOP | 8-bit, 400kHz

Product Overview

The PCA9557DBR from Texas Instruments is a low-voltage 8-bit I²C 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. The device features an open-drain interrupt output, three hardware address pins allowing up to eight devices on the same bus, and a reset input that forces the device into a known state. The PCA9557DBR is offered in a compact 16-SSOP package, making it ideal for space-constrained applications.

Detailed Technical Specifications

Key Features

• 8-bit bidirectional I/O ports with internal pull-up resistors
• I²C bus interface supporting standard (100 kHz) and fast (400 kHz) modes
• Three hardware address pins allow up to eight devices on the same bus
• Open-drain active-low interrupt output
• Active-low reset input with internal pull-up
• Low standby current consumption
• Power-on reset with all channels set as inputs
• No glitch on power-up
• Supports hot insertion
• Operating voltage range: 2.3 V to 5.5 V
• Industrial temperature range: -40°C to +85°C

Target Applications

• 5G base station control and monitoring (e.g., fan speed control, status LED indication)
• Automotive dashboard control (e.g., button matrix scanning, backlight control)
• Industrial PLC I/O expansion
• Server and telecom equipment (e.g., power supply sequencing, fault detection)
• Consumer electronics (e.g., smart home hubs, gaming consoles)
• Medical devices (e.g., patient monitoring systems)

Global Supply Chain & Wholesale Solutions

At Jasin Chip, we provide professional supply chain and wholesale solutions for PCA9557DBR. 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.
• 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.

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

PCA9557DBR 是德州儀器 (TI) 推出的一款低電壓 8 位 I²C 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。該器件具有開漏中斷輸出、三個硬件地址引腳（允許總線上最多八個器件）以及一個復位輸入（可將器件強制置於已知狀態）。PCA9557DBR 採用緊湊的 16-SSOP 封裝，非常適合空間受限的應用。

詳細技術參數

核心特性

• 8 位雙向 I/O 端口，帶內部上拉電阻
• I²C 總線接口，支持標準 (100 kHz) 和快速 (400 kHz) 模式
• 三個硬件地址引腳，允許總線上最多八個器件
• 開漏低電平有效中斷輸出
• 低電平有效復位輸入，帶內部上拉
• 低待機電流消耗
• 上電復位，所有通道設置為輸入
• 上電無毛刺
• 支持熱插入
• 工作電壓範圍：2.3 V 至 5.5 V
• 工業溫度範圍：-40°C 至 +85°C

典型應用場景

• 5G 基站控制與監控（例如風扇速度控制、狀態 LED 指示）
• 汽車儀表板控制（例如按鍵矩陣掃描、背光控制）
• 工業 PLC I/O 擴展
• 服務器和電信設備（例如電源排序、故障檢測）
• 消費電子（例如智能家居中心、遊戲主機）
• 醫療設備（例如病人監護系統）

環球供應鏈與批發合作夥伴方案

在 Jasin Chip，我們為 PCA9557DBR 提供全面的供應鏈與批發解決方案。 我們的核心優勢包括：

• 全天候環球客戶支援：專業團隊為您提供即時報價及技術支援，無需漫長等待。
• 現貨庫存，即日發貨：確保現貨充足。下午 4 點前確認訂單，即可安排當天寄出。
• 深港聯動，結算靈活：深圳直發全球，物流高效可靠；支援香港銀行戶口轉賬及多幣種結算。
• Escrow 擔保交易：支援 Escrow.com 平台交易，保障買賣雙方權益，小批量訂單亦可安心在線下單。
• BOM 配單與樣板服務：提供樣板測試及認證支援。專注一站式 BOM 配套及緊急缺料採購服務。

品質保證與合規

Jasin Chip 承諾所有出貨產品均為原廠正貨，具備完善的品質保證及產品可追溯性。

• 100% 原廠正貨：承諾所有供應零件均為原裝現貨，品質嚴格把關，來源清晰可追溯。
• 符合 RoHS 認證：所有電子元器件均符合國際環保標準及相關安全認證。
• 原廠封裝保護：嚴格保留原廠原始包裝及封條，確保物流過程中的靜電防護 (ESD) 與物理安全。

以上產品均為原廠正貨，提供 BOM 配單及現貨庫存支援，歡迎查詢。

HONG KONG JASIN SEMICONDUCTOR TECHNOLOGY COMPANY LIMITED
Trusted Partner for Automotive, Industrial, and Hard-to-find Components.
WhatsApp: +852 5209 9691 | Email: [email protected]