PCF8574 I2C Port Expander I/O Extension 8 Pin

This PCF8574 port expander adds 8 inputs and outputs to a Raspberry Pi or Arduino via the I2C bus, keeping wiring to a minimum. The breakout board can be set up quickly with Dupont jumper cables. Several boards can be plugged together. 8 addresses can be selected via 3 jumpers, allowing up to 64 I/O. The inputs and outputs are not very fast, but sufficient for buttons and LEDs.

Recommended Accessories:

• Dupont Jumper Cable Set 20cm 60 Pieces.
• Membrane Keyboard 16 Keys / Keypad 4x4 Matrix

Features:

• 8 inputs and outputs and 1 interrupt pin
• Address via jumpers A0, A1, A2
• Check the marking on the chip: PCF8574AT is at 0x38 to 0x3F, PCF8574T without A at 0x20 to 0x27
• I2C connections on both sides: pins and sockets for plugging together

Application Examples:

• Keypads and buttons
• Controlling LEDs
• More I/O on Raspberry Pi and Arduino

Documentation:

• PCF8574 library (GitHub)
• PCF8574 datasheet NXP (PDF)
• PCF8574 datasheet (PDF)

Technical Data:

• Chip: PCF8574AT
• Operating voltage: 3.3 V to 5 V
• Inputs and outputs: 8
• Interrupt pin: 1
• Pitch: RM 2.54 mm
• Interface: I2C
• Addressing: 8 addresses, 0x38 to 0x3F
• Default address: 0x38
• Connections: VCC, GND, SDA, SCL
• Dimensions: 54 × 15 × 12 mm
• Weight: 5 g

Scope of Delivery:

• 1× PCF8574 I2C port expander I/O extension 8 pin