【16-Bit I/O Expansion with I²C Interface】 16-bit quasi-bidirectional I/O ports expand microcontroller capabilities; supports I²C/SMBus communication at 400kHz; Suitable for for Arduino, for Raspberry Pi, and STM32 projects.
【Flexible Address Configuration for Multiple Devices】 Three hardware address pins (A0/A1/A2) allow up to eight modules in parallel (addresses 0x20–0x27); easy setup for multi-device systems without conflicts.
【Low-Power Design for Battery-Powered Applications】 Standby current ≤10µA; working current ≤100mA; suitable for portable and energy-efficient systems; compatible with 2.5V–5.5V power supplies.
【Integrated Level Shifting for Universal Compatibility】 Built-in 3.3V/5V level conversion circuit; works seamlessly with popular controllers like ESP32 and for Raspberry Pi; no external components needed for basic use.
【Reliable Interrupt Output for Real-Time Monitoring】 Open-drain interrupt output (INT pin) triggers on input state changes; requires 10kΩ pull-up resistor; enhances system responsiveness in automation and control applications.

1. Product Parameters ( )

Core Chip: PCF8575 (TI , I²C/SMBus Protocol Compatible) .

Working Voltage: 2.5V-5.5V DC (Recommend 5V ±10%, Forbidden >6V) .

Number of I/O: 16-bit Quasi-bidirectional Port

Communication Interface: I²C/SMBus (Maximum Rate 400kHz) .

Address Configuration: 3 Hardware Address Pins (A0/A1/A2), Support 8 Devices Parallel (Address Range 0x20-0x27) .

Output Drive Capability: Low-level Sink Current 25mA

Power Consumption: Standby Current ≤10µA, Working Current ≤100mA .

Interrupt Function: Open Drain Interrupt Output

Working Temperature: -40℃ to 85℃ (Reliable) .

2. Product Main Pin Function ( )

VCC: Power Input Positive (2.5V-5.5V DC). Parallel 10µF Ceramic + 0.1µF HF Capacitor, Ripple

GND: Power Ground. Star Single Point Grounding, Wire Width ≥1mm.

SCL: I²C Clock Line (Rising Edge Valid). Trace Length ≤20cm, External 4.7kΩ Pull-up to VCC.

SDA: I²C Data Line (Bidirectional). Equal Length with SCL (Deviation ≤2mm), Parallel 100pF Capacitor for Anti-interference.

A0/A1/A2: Hardware Address Configuration. Floating=Low(0), VCC=High(1). Set Unique Address (e.g., A0=1/A1=0/A2=1 → 0x25) .

INT: Interrupt Output (Open-Drain, Low Active). Requires 10kΩ Pull-up Resistor. Triggers on Input State Change .

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