EFM32WG Datasheet, PDF (411/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

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16 I²C - Inter-Integrated Circuit Interface
0123 4
Quick Facts
What?
The I²C interface allows communication
on I²C-buses with the lowest energy
consumption possible.
EFM3 2
I²C m aster/slave
SCL
SDA
V_DD
Ot her I²C
m aster
Ot her I²C
sla v e
I²C
EEPROM
Why?
I²C is a popular serial bus that enables
communication with a number of external
devices using only two I/O pins.
How?
With the help of DMA, the I²C interface
allows I²C communication with minimal CPU
intervention. Address recognition is available
in all energy modes (except EM4), allowing
the MCU to wait for data on the I²C-bus with
sub-µA current consumption.
16.1 Introduction
The I²C module provides an interface between the MCU and a serial I²C-bus. It is capable of acting
as both master and slave, and supports multi-master buses. Standard-mode, fast-mode and fast-mode
plus speeds are supported, allowing transmission rates all the way from 10 kbit/s up to 1 Mbit/s. Slave
arbitration and timeouts are also provided to allow implementation of an SMBus compliant system. The
interface provided to software by the I²C module allows both fine-grained control of the transmission
process and close to automatic transfers. Automatic recognition of slave addresses is provided in all
energy modes (except EM4).
16.2 Features
• True multi-master capability
• Support for different bus speeds
• Standard-mode (Sm) bit rate up to 100 kbit/s
• Fast-mode (Fm) bit rate up to 400 kbit/s
• Fast-mode Plus (Fm+) bit rate up to 1 Mbit/s
• Arbitration for both master and slave (allows SMBus ARP)
• Clock synchronization and clock stretching
• Hardware address recognition
• 7-bit masked address
• General call address
• Active in all energy modes (except EM4)
• 10-bit address support
• Error handling
• Clock low timeout
• Clock high timeout
• Arbitration lost
• Bus error detection
• Double buffered data
• Full DMA support
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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