SAM D21 SERCOM I²C Slave Overview

The SAM D21 family of devices include up to six instances of the SERCOM serial communication interface peripheral, which among other things, can be configured to be an I²C interface.

A SERCOM instance can be configured to be either an I²C master or an I²C slave. Both master and slave have an interface containing a shift register, a transmit buffer and a receive buffer. In addition, the I²C master uses the SERCOM baud-rate generator, while the I²C slave uses the SERCOM address match logic. This peripheral is compatible with SMBus and PMBus.

This page focuses on the slave mode of the SERCOM I²C peripheral. Some of the key features of the slave mode I²C operation are:

  • Operation in sleep modes
  • Wake on address match
  • 16-byte FIFO available and accessible with DMA
  • 2 or 4-wire Modes available
  • 7 or 10-bit address match in hardware for:
    • Unique address (or general call address)
    • Address range
    • Two unique addresses

The I²C slave is byte-oriented and interrupt-based. The number of interrupts generated is kept at a minimum by the automatic handling of most events. There are two main strategies for handling I²C interrupts. Additionally, the peripheral offers a Smart Mode, which allows for more automation of the operation without user interaction.


 Learn More

SERCOM I²C Slave Configuration
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SERCOM I²C Slave Example Project
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