PCA8574AD I2C Port Expander I/O Extension 8 Pin

This port expander from RobotDyn with PCA8574AD chip adds 8 inputs and outputs to an Arduino or Raspberry Pi via the I2C bus. 8 addresses can be selected via 3 jumpers, allowing up to 64 I/O. Several modules can be plugged together. Only one module needs the pull-up resistors; on the others, the solder bridges J1 and J2 on the back are cut.

Note: The correct addresses are 0x38 to 0x3F. If the module is marked 0x20 to 0x27, this does not apply.

Recommended Accessories:

• Dupont Cable M-F 20cm 20 Pieces
• Membrane Keyboard 16 Keys / Keypad 4x4 Matrix

Features:

• 8 inputs and outputs P0 to P7 and 1 interrupt pin
• Address via jumpers A0, A1, A2, table on the back
• I2C connections on both sides: pins and sockets for plugging together
• Pull-up resistors can be disconnected via J1 and J2

Application Examples:

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

Documentation:

• PCA8574A datasheet NXP (PDF)

Technical Data:

• Chip: PCA8574AD
• Operating voltage: 3.3 V to 5 V
• Inputs and outputs: 8
• Pitch: RM 2.54 mm
• Interface: I2C
• Addressing: 8 addresses, 0x38 to 0x3F
• Default address: 0x38
• Connections: +5V, GND, SDA, SCL, INT, P0 to P7
• Size: 30 × 28 × 12 mm
• Weight: 7 g

Scope of Delivery:

• 1× PCA8574AD I2C Port Expander I/O Extension 8 Pin