Product Overview

PCF8574PWR is a remote 8-bit I/O expander for IC bus launched by TI (Texas Instruments), belonging to the PCF8574 series and featuring a TSSOP (PW package). It is specifically designed to solve the problem of insufficient I/O ports in microcontrollers. This product supports 2.5V-6V wide voltage supply, integrates an 8-bit quasi-bidirectional I/O port (P0-P7), and has latched output with high-current drive capability, enabling direct driving of peripherals such as LEDs. It also includes an open-drain interrupt output (INT) to quickly respond to rising or falling edge changes of port input levels. With the compactness of TSSOP package, standby current as low as 10μA, and excellent environmental adaptability, PCF8574PWR becomes a cost-effective PCF8574PWR expander solution for efficient I/O interface expansion in smart home, industrial control, consumer electronics and other fields.

Key Features

• Efficient IC Expansion, Simplified Wiring: PCF8574PWR communicates with microcontrollers via IC bus (SCL/SDA), and only 2 wires are needed to realize 8-channel I/O expansion; it supports setting 8 different slave addresses (decimal 32-39) through A0-A2 address pins, and a single IC bus can cascade multiple devices to expand up to 64-channel I/O, which greatly reduces the complexity of PCB wiring and lowers the difficulty of system design.
• Wide Voltage Adaptation + Strong Drive Capability: It supports 2.5V-6V wide supply voltage range, compatible with lithium batteries, linear power supplies and other power supply schemes, adapting to most embedded systems; the 8-bit I/O port has a maximum low-level output current (IOL) of 25mA (when VCC=5V, VO=1V), which can directly drive peripherals such as LEDs and small relays without additional driver chips, reducing BOM cost.
• Low Power Consumption + Interrupt Wake-Up: The standby current of PCF8574PWR is only 10μA (max, VCC=6V), and the maximum normal operating current is 100μA (IC clock 100kHz), which significantly reduces system power consumption; the open-drain interrupt output (INT) can detect changes in port input levels and trigger microcontroller interrupts, eliminating the need for continuous IC bus polling, improving system response efficiency, especially suitable for battery-powered portable devices.
• Quasi-Bidirectional I/O, Flexible Switching: The 8-bit I/O port (P0-P7) is in quasi-bidirectional mode, defaulting to high level at power-on, without the need for data direction control registers, and can flexibly switch between input/output functions according to actual needs; the current source and strong pull-up design are activated in the high-level state, ensuring fast rising edges during heavy-load output, adapting to multi-scenario needs such as sensor signal acquisition and peripheral control.
• Compact TSSOP Package, Space-Saving: Adopting TSSOP (PW package) with 20-pin design, the package size is compact (width 6.95mm, length 7.1mm, thickness 1.6mm), saving about 50% of PCB space compared with traditional DIP packages, and adapting to high-density circuit design scenarios with strict package size requirements such as smart bracelets and small home appliances.

Technical Specifications

Typical Applications

• Smart Home Field: In smart switch panels, environmental monitoring gateways, and smart home controllers, PCF8574PWR can expand the I/O ports of microcontrollers to connect lighting control modules, temperature-humidity sensors, human infrared sensors and other peripherals. Its low-power feature is suitable for battery-powered scenarios, the interrupt function can quickly respond to sensor data changes, and the compact TSSOP package can be integrated into miniaturized panel designs, improving the integration and user experience of smart home products.
• Industrial Control Field: Industrial automation equipment (such as PLC expansion modules, sensor data acquisition terminals, and motor control units) often faces the problem of insufficient I/O ports. With its wide temperature range of -40℃~+85℃ and strong drive capability, PCF8574PWR can expand multiple sensors (temperature, pressure) and actuators (relays, indicator lights) at the same time; the IC cascading function supports multi-device collaboration, and the interrupt output reduces bus polling overhead, ensuring the real-time and reliability of industrial data acquisition and control.
• Consumer Electronics Field: In portable electronic devices (such as Bluetooth speakers, smart bracelets, sports watches) and small home appliances (such as coffee machines, air purifier control panels), PCF8574PWR can expand I/O ports to connect LED indicators, buttons, small motors and other components. Its 2.5V-6V wide voltage range is compatible with lithium batteries, the low-power feature extends the battery life of devices, and the compact TSSOP package saves internal space, facilitating the miniaturized design of products.
• Medical Equipment Field: In portable medical monitors (such as oximeters, heart rate monitors) and small diagnostic devices, PCF8574PWR can expand I/O ports to connect physiological parameter sensors and status indicators. The ultra-low standby current of 10μA greatly extends the battery life of battery-powered devices, the wide voltage range adapts to the stable power supply needs of medical equipment, and the quasi-bidirectional I/O design ensures the accuracy of sensor data acquisition, providing reliable I/O expansion support for medical equipment.
• Automotive Electronics Field: In automotive body control modules (such as window control, in-car ambient light adjustment) and on-board diagnostic devices, the wide temperature range of PCF8574PWR can adapt to temperature fluctuations of -40℃~+85℃ inside the car; the IC interface facilitates communication with on-board microcontrollers, the expanded I/O ports can connect multiple actuators and status detection pins, and the interrupt function quickly responds to device status changes, improving the control efficiency and stability of on-board systems.

Why Choose PCF8574PWR ?

• High Expansion Efficiency, Low Cost: A single chip realizes 8-channel I/O expansion, and the IC cascading function supports multi-device expansion without complex parallel circuits; it can directly drive LEDs and other peripherals, reducing the cost of driver chips, and at the same time simplifying wiring, lowering PCB design and production costs, with comprehensive cost-effectiveness far exceeding similar I/O expansion solutions.
• Strong Compatibility, Wide Adaptation: The 2.5V-6V wide voltage design is compatible with most embedded system power supply schemes, supports 8 IC slave addresses, and can be seamlessly connected with mainstream microcontrollers such as 8051 microcontrollers, STM32, and Arduino, without modifying hardware circuits, adapting to smart home, industrial, medical and other multi-field applications.
• Low Power Consumption for Long Battery Life, Good Scenario Adaptability: The ultra-low standby current of 10μA is about 30% lower than similar products (such as PCF8575), which can significantly extend the battery life of battery-powered devices; the interrupt wake-up function reduces system resource occupation, especially suitable for portable devices and wireless sensor nodes sensitive to power consumption.
• Strong Environmental Adaptability, High Reliability: The wide operating temperature range of -40℃~+85℃ meets the needs of harsh environments such as industry and automotive; the package thermal impedance is 83℃/W, with stable heat dissipation performance, and the chip temperature rise is only about 2℃ (calculated by power consumption of 0.025W) at the maximum output current of 25mA; it passes strict EMC tests, with strong anti-interference ability, ensuring long-term stable operation of devices.
• Compact Package + Mature Ecosystem, Convenient Development: The TSSOP package saves PCB space, adapting to miniaturized product design; as a mature product of TI, PCF8574PWR has complete development materials (datasheet, application notes, reference design), compatible with mainstream development tools such as Keil and IAR, and TI provides professional technical support, shortening the product development cycle and accelerating mass production.

SUNTOP COMPANY INTRODUCTION

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