SBAA565 November   2022 ADC081C021 , ADC081C027 , ADC101C021 , ADC101C027 , ADC121C021 , ADC121C021-Q1 , ADC121C027 , ADC128D818 , ADS1000 , ADS1000-Q1 , ADS1013 , ADS1014 , ADS1015 , ADS1015-Q1 , ADS1100 , ADS1110 , ADS1112 , ADS1113 , ADS1114 , ADS1115 , ADS1115-Q1 , ADS7823 , ADS7827 , ADS7828 , ADS7828-Q1 , ADS7830 , ADS7924 , AFE539A4 , DAC081C081 , DAC081C085 , DAC101C081 , DAC101C081Q , DAC101C085 , DAC121C081 , DAC121C085 , DAC43204 , DAC43401 , DAC43401-Q1 , DAC43608 , DAC43701 , DAC43701-Q1 , DAC53002 , DAC53004 , DAC53202 , DAC53204 , DAC53204W , DAC53401 , DAC53401-Q1 , DAC53608 , DAC53701 , DAC53701-Q1 , DAC5571 , DAC5573 , DAC5574 , DAC5578 , DAC60501 , DAC60502 , DAC63002 , DAC63004 , DAC63202 , DAC63204 , DAC6571 , DAC6573 , DAC6574 , DAC6578 , DAC70501 , DAC70502 , DAC7571 , DAC7573 , DAC7574 , DAC7578 , DAC7678 , DAC80501 , DAC80502 , DAC8571 , DAC8574

 

  1.   Abstract
  2.   Trademarks
  3. 1I2C Overview
    1. 1.1 History
    2. 1.2 I2C Speed Modes
  4. 2I2C Physical Layer
    1. 2.1 Two-Wire Communication
    2. 2.2 Open-Drain Connection
    3. 2.3 Non-Destructive Bus Contention
  5. 3I2C Protocol
    1. 3.1 I2C START and STOP
    2. 3.2 Logical Ones and Zeros
    3. 3.3 I2C Communication Frames
  6. 4I2C Examples
    1. 4.1 DAC80501 Example
      1. 4.1.1 DAC80501 DAC Data Register
      2. 4.1.2 DAC80501 I2C Example Write
    2. 4.2 ADS1115 Example
      1. 4.2.1 ADS1115 Configuration Register
      2. 4.2.2 ADS1115 I2C Example Read
      3. 4.2.3 ADS1115 Conversion Result
  7. 5Reserved Addresses
    1. 5.1 General Call
    2. 5.2 START Byte
    3. 5.3 C-Bus Address, Different Bus Format, Future Purposes
    4. 5.4 HS-Mode Controller Code
    5. 5.5 Device ID
    6. 5.6 10-Bit Target Addressing
      1. 5.6.1 10-Bit Target Addressing Write
      2. 5.6.2 10-Bit Target Addressing Read
  8. 6Advanced Topics
    1. 6.1 Clock Synchronization and Arbitration
    2. 6.2 Clock Stretching
    3. 6.3 Electrical Specifications
    4. 6.4 Voltage Level Translation
      1. 6.4.1 Example 1
      2. 6.4.2 Example 2
      3. 6.4.3 Example 3
      4. 6.4.4 Example 4
    5. 6.5 Pullup Resistor Sizing
      1. 6.5.1 Minimum Pullup Resistance Sizing
      2. 6.5.2 Maximum Pullup Resistance Sizing
  9. 7Protocols Similar to I2C
  10. 8Summary

4 I2C Examples

This section uses two examples to show how I2C can communicate with different data converters. First, the I2C protocol is used to write to the DAC data register of the DAC80501 to set the output voltage. Second, I2C is used to read from the conversion register from the ADS1115 ADC.