• Description

PCF8575 I2C IO Expansion Module - 3.3V/5V

Have you run out of I/O pins? This great IC allows the user to expand up to 16 I/O using only two I/O for control! The PCF8575C is controlled through an I2C interface and features 16-bits of quasi-bidirectional input/output pins.



The device features a 16-bit quasi-bidirectional input/output (I/O) port (P07–P00, P17–P10), including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.

Quick Spec

• Operating Voltage: 2.5-5.5V DC
• Operating Current: 100mA (max)
• Low Standby-Current Consumption of 10 µA Max
• I2C Address: 0x20 (default), can be modified by soldering A1 and selection pads A2
• 16 individually addressable pins
• Each pin configurable for input or output
• Open drain interrupt output pin for input change interruption
• Ideal for UNO R3 and other MCUs to control simple relay, buzzer, button, led
• Dimensions: 32.4 x 21.6mm
• Net Weight: 5g

Wiring Diagram

Sample Code

#include <Wire.h>
 
// Set I2C address
int address = 0x20;
 
void setup()
{ 
  Wire.begin();
  // Set all ports as output
  pf575_write(word(B11111111,B11111111));
} 
 
void loop()
{
  // Set port P0 on
  pf575_write(word(B00000000,B00000001));
  delay(1000);
  // Set port P0 off
  pf575_write(word(B00000000,B00000000));
  delay(1000);
} 
 
// Function for writing two Bytes to the I2C expander device
void pf575_write(uint16_t data) 
{
  Wire.beginTransmission(address);
  Wire.write(lowByte(data));
  Wire.write(highByte(data));
  Wire.endTransmission();
}

Resources

• PCF8575 Datasheet
• PCF8575 Library

Shipping List

• 1 x PCF8575 I2C IO Expansion Module - 3.3V/5V
• 1 x Header Set

PCF8575 I2C IO Expansion Module - 3.3V/5V

• Brand: Generic
• Product Code: PCF8575-MOD
• Weight: 0.005kg
• Product Status : Active

Stock

Warehouse	Stock Status	Location
Centurion	In Stock	BX1-02
Stellenbosch	In Stock	L101
Bulk Location	No Stock

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• R46.00 (Inc Tax: R52.90)