Product Overview

PCF8574DGVR is a remote 8-bit I/O expander for IC bus launched by TI (Texas Instruments), a core model of the PCF8574 series, featuring a TVSOP (DGV package). It is specifically designed for embedded systems that require expanding the I/O interfaces of 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 LED driving. It also includes an open-drain interrupt output (INT) to quickly respond to changes in port input levels. With its compact package design and standby current as low as 10μA, PCF8574DGVR becomes a cost-effective PCF8574DGVR expander solution for solving the problem of insufficient I/O ports in microcontrollers in fields such as smart home, industrial control, and consumer electronics.

Key Features

• Efficient IC Interface Expansion: PCF8574DGVR realizes bidirectional communication with microcontrollers via the IC bus (SCL/SDA). A single bus can connect multiple devices (8 different slave addresses set via A0-A2 address pins), easily expanding the microcontroller's I/O ports by 8 channels. No additional complex circuits are required, simplifying system design.
• Wide Voltage & High-Current Drive: It supports a 2.5V-6V wide supply voltage range, adapting to most embedded system power solutions; the 8-bit I/O port has high-current drive capability, with a maximum low-level output current (IOL) of 25mA, allowing direct driving of peripherals such as LEDs and relays without additional driver chips.
• Low Power Consumption & Interrupt Wake-Up: The standby current of PCF8574DGVR is only 10μA (max), significantly reducing system power consumption; the open-drain interrupt output (INT) can detect rising/falling edges of port input levels and trigger microcontroller interrupts, eliminating the need for continuous IC bus polling and improving system response efficiency.
• Quasi-Bidirectional I/O Design: The 8-bit I/O port (P0-P7) operates in quasi-bidirectional mode, requiring no data direction control signals. It defaults to high level at power-on and can flexibly switch between input and output modes; in the high-level state, a current source is activated, and the strong pull-up design ensures fast rising edges for heavily loaded outputs, adapting to multi-scenario signal transmission needs.
• Compact TVSOP Package: Adopting a TVSOP (DGV package) with 20 pins, the compact size (only 7.0mm in width and 5.6mm in length) saves PCB space, making it suitable for applications with strict package size requirements such as portable devices and dense circuits.

Technical Specifications

Typical Applications

• Smart Home Field: In smart home gateways, smart switch panels, and environmental monitoring devices, PCF8574DGVR can expand the I/O ports of microcontrollers to connect lighting control modules, temperature-humidity sensors, and buttons. Its low-power feature is suitable for battery-powered scenarios, and the interrupt output function can quickly respond to sensor data changes. Meanwhile, the compact TVSOP package can be integrated into miniaturized device designs, improving the integration and cost-effectiveness of smart home products.
• Industrial Control Field: Industrial automation equipment (such as PLC expansion modules and sensor data acquisition terminals) often faces the problem of insufficient microcontroller I/O ports. With its wide temperature range of -40℃~+85℃ and IC multi-device cascading capability, PCF8574DGVR can expand multiple sensors (e.g., temperature and pressure sensors) and actuators (e.g., small relays) simultaneously. The interrupt function reduces bus polling overhead, ensuring real-time industrial data acquisition and control.
• Consumer Electronics Field: In portable electronic devices (such as Bluetooth speakers and smart bracelets) and home appliances (such as small home appliance control panels), PCF8574DGVR can expand I/O ports to connect LED indicators, buttons, and small motors. Its 2.5V-6V wide voltage range adapts to lithium batteries and linear power supplies, and its high-current drive capability can directly light LEDs without additional driving components, simplifying home appliance circuit design.
• Medical Equipment Field: In portable medical monitors and small diagnostic devices, PCF8574DGVR can expand I/O ports to connect sensors (e.g., blood oxygen and heart rate sensors) and status indicators. The standby current as low as 10μA extends the battery life of battery-powered devices, and the wide voltage range adapts to the stable power supply needs of medical equipment. Meanwhile, the quasi-bidirectional I/O design ensures the accuracy and reliability of sensor data acquisition.
• Automotive Electronics Field: In automotive body control modules (such as window control and in-car lighting adjustment) and on-board diagnostic devices, the wide temperature range of PCF8574DGVR can adapt to temperature fluctuations of -40℃~+85℃ inside the car. The IC interface facilitates communication with on-board microcontrollers, and the expanded I/O ports can connect multiple actuators and status detection pins. The interrupt function quickly responds to device status changes, improving the control efficiency of on-board systems.

Why Choose PCF8574DGVR?

• High Interface Expansion Efficiency, Simplified Design: A single PCF8574DGVR chip can expand 8 I/O channels, communicating with microcontrollers via the IC bus. Only 2 wires (SCL/SDA) are needed for control, significantly reducing PCB wiring compared to parallel expansion schemes. It also supports 8 slave addresses, allowing multiple chips to be cascaded on a single bus, easily meeting multi-device expansion needs.
• Low Hardware Cost, Strong Drive Capability: It can directly drive LEDs (max IOL=25mA) without additional driver chips, reducing the bill of materials (BOM) cost; the 2.5V-6V wide voltage design adapts to most existing power solutions, eliminating the need for additional voltage conversion circuits and reducing system hardware costs and design complexity.
• Low Power Consumption for Long Battery Life, Multi-Scenario Adaptation: The standby current is only 10μA (max), much lower than similar I/O expanders, making it particularly suitable for battery-powered portable devices (such as smart sensors and handheld terminals). It can significantly extend device battery life and reduce charging frequency.
• Strong Environmental Adaptability, High Reliability: The wide operating temperature range of -40℃~+85℃ meets the needs of harsh environments such as industry, automotive, and outdoor; the package thermal impedance (θJA) is 92℃/W, ensuring stable heat dissipation performance. It also passes strict electromagnetic compatibility tests, ensuring stable operation of PCF8574DGVR in complex electromagnetic environments.
• Compact Package Saves Space, Convenient Development: The TVSOP (DGV package) of PCF8574DGVR has a compact size (7.0mm×5.6mm×1.6mm) with 20 pins, saving PCB space and adapting to miniaturized device designs; as a standard TI product, PCF8574DGVR has mature development materials (such as datasheets and application notes) and is compatible with mainstream microcontrollers (such as 8051 microcontrollers and STM32), shortening the product development cycle.

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