All Products Port Expander

PCA9555PWR / The PCA9555PWR is a versatile and widely used <strong>16-bit I2C/SMBus I/O expander</strong> developed by <strong>Texas Instruments</strong>, designed to extend the number of general-purpose input/output pins in microcontroller-based systems. It provides an efficient solution for expanding digital I/O capability without increasing processor pin count. <br><br>This device operates within a <strong>2.3V to 5.5V supply voltage range</strong> and communicates via a <strong>standard I2C interface with speeds up to 400kHz</strong>, ensuring compatibility with a wide range of embedded platforms. It features <strong>16 programmable I/O ports</strong>, organized as two 8-bit banks, each configurable as input or output through internal registers. <br><br>The PCA9555PWR includes <strong>input, output, polarity inversion, and configuration registers</strong>, allowing flexible control of each I/O pin. At power-up, all pins default to input mode, and the system controller can dynamically configure them as needed. <br><br>An integrated <strong>open-drain active-low interrupt output</strong> notifies the host microcontroller of input state changes, reducing the need for constant polling and improving system efficiency. It also supports <strong>hardware address selection using three address pins</strong>, enabling up to eight devices on the same I2C bus. <br><br>The device offers <strong>low standby current consumption (as low as 1µA)</strong> and <strong>5V-tolerant I/O ports</strong>, making it suitable for low-power and mixed-voltage systems. Its outputs are latched and capable of directly driving loads such as LEDs, enhancing design flexibility. <br><br>Encapsulated in a compact <strong>24-pin TSSOP surface-mount package</strong>, the PCA9555PWR is ideal for space-constrained PCB designs while maintaining robust electrical performance. <br><br>The <strong>PCA9555PWR</strong> is commonly used in <strong>embedded systems, industrial control, I/O expansion modules, LED control applications, communication systems, and IoT devices</strong>, where additional digital I/O channels are required with minimal hardware complexity.
PCA9555PWR

Description: The PCA9555PWR is a versatile and widely used 16-bit I2C/SMBus I/O expander ...
Package: T&R | MOQ: 2000 | MPQ: 2000

PCF8574ADWR / The PCF8574ADWR is an 8-bit I/O expander IC developed by Texas Instruments, designed to extend the number of digital input/output pins of microcontrollers via the I2C (two-wire) interface. It is widely used in embedded systems where GPIO resources are limited.<br><br>The device features 8 quasi-bidirectional I/O ports (P0–P7), each of which can function as either input or output without requiring a direction control register. This simplifies firmware design and reduces system complexity.<br><br>Operating within a supply voltage range of 2.5V to 6V, the PCF8574ADWR is compatible with a wide range of microcontrollers and logic systems. It supports standard I2C communication up to 100 kHz, enabling reliable and efficient data exchange.<br><br>The IC includes an open-drain interrupt (INT) output, which allows the device to notify the host microcontroller when input states change—eliminating the need for continuous polling and improving system efficiency.<br><br>Each output pin is latched and capable of driving LEDs directly, making the device suitable for display and indicator applications. Additionally, three hardware address pins (A0–A2) allow multiple devices (up to 8 or more) to be connected on the same I2C bus for expanded I/O capability.<br><br>With low power consumption (µA-level standby current) and a compact SOIC-16 package, the PCF8574ADWR is ideal for space-constrained and low-power designs.<br><br>It is widely used in applications such as LCD interfaces (I2C LCD modules), keypad scanning, LED control, industrial automation, IoT devices, and microcontroller-based systems, where expanding digital I/O capability is required.
PCF8574ADWR

Description: The PCF8574ADWR is an 8-bit I/O expander IC developed by Texas Instruments, designed to ex ...
Package: T&R | MOQ: 2000 | MPQ: 2000

PCF8575PWR / I/O Expander 16 I2C, SMBus 400kHz, 16 I/O pins, configurable as input or output (grouped in two 8-bit ports)
PCF8575PWR

Description: I/O Expander 16 I2C, SMBus 400kHz, 16 I/O pins, configurable as input or output (grouped i ...
Package: T&R | MOQ: 2000 | MPQ: 2000













info@signalhk.com

+852 2417 2366

Room 1304, 13/F, Allways Centre, 468 Jaffe Road, Causeway Bay, Hong Kong.


SIGNAL-HK WIKI BLOG

Copyright © 2008-2024 Signal HK Limited. All Rights Reserved.Designated trademarks and brands are the property of their respective owners.
Use of this Website constitutes acceptance of Signal HK Limited Terms of Use and Privacy Policy

Cookie Policy | MSN EQV Parts |