Instructions for Using TCA9555PWR

1. Power Supply:

   • Connect the V_CC pin to a power supply within the range of 1.65V to 5.5V.
   • Connect the GND pin to the ground.

2. I2C Communication:

   • Connect the SDA (Serial Data) and SCL (Serial Clock) pins to the I2C bus.
   • Use pull-up resistors on the SDA and SCL lines to V_CC. Typical values are 4.7kΩ to 10kΩ.

3. Pin Configuration:

   • The TCA9555PWR has 16 general-purpose input/output (GPIO) pins divided into two 8-bit ports (Port 0 and Port 1).
   • Configure each pin as input or output using the configuration registers.

4. Register Map:

   • Input Port 0 (0x00): Reads the state of Port 0.
   • Input Port 1 (0x01): Reads the state of Port 1.
   • Output Port 0 (0x02): Writes to Port 0.
   • Output Port 1 (0x03): Writes to Port 1.
   • Polarity Inversion Port 0 (0x04): Inverts the polarity of Port 0.
   • Polarity Inversion Port 1 (0x05): Inverts the polarity of Port 1.
   • Configuration Port 0 (0x06): Configures Port 0 as input (1) or output (0).
   • Configuration Port 1 (0x07): Configures Port 1 as input (1) or output (0).

5. Reading and Writing:

   • To read from a port, send a read command to the corresponding register address.
   • To write to a port, send a write command to the corresponding register address.

6. Polarity Inversion:

   • Set the corresponding bit in the Polarity Inversion register to 1 to invert the polarity of the pin.

7. Configuration:

   • Set the corresponding bit in the Configuration register to 1 for input and 0 for output.

8. Addressing:

   • The TCA9555PWR can be configured with different I2C addresses by connecting the A0, A1, and A2 pins to V_CC, GND, or left floating.

9. Example Code:

   // Example code to configure and use the TCA9555PWR with an I2C library
   #include <Wire.h>
   
   #define TCA9555_ADDRESS 0x20  // Default I2C address
   
   void setup() {
     Wire.begin();
     // Configure Port 0 as input and Port 1 as output
     Wire.beginTransmission(TCA9555_ADDRESS);
     Wire.write(0x06);  // Configuration Port 0
     Wire.write(0xFF);  // All inputs
     Wire.endTransmission();
   
     Wire.beginTransmission(TCA9555_ADDRESS);
     Wire.write(0x07);  // Configuration Port 1
     Wire.write(0x00);  // All outputs
     Wire.endTransmission();
   }
   
   void loop() {
     // Read input from Port 0
     Wire.beginTransmission(TCA9555_ADDRESS);
     Wire.write(0x00);  // Input Port 0
     Wire.endTransmission();
     Wire.requestFrom(TCA9555_ADDRESS, 1);
     byte input0 = Wire.read();
   
     // Write output to Port 1
     Wire.beginTransmission(TCA9555_ADDRESS);
     Wire.write(0x03);  // Output Port 1
     Wire.write(input0);  // Echo input to output
     Wire.endTransmission();
   }
   

This table and set of instructions should help you effectively use the TCA9555PWR in your projects.