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15 I C - Inter-Integrated Circuit Interface
...the world's most energy friendly microcontrollers
2
Quick Facts
What?
The I C interface allows communication
on I C-buses with the lowest energy
I C is a popular serial bus that enables
0   1   2   3
4
V DD
EFM32
I 2 C m aster/slave
SCL
SDA
2
2
consumption possible.
Why?
2
communication with a number of external
devices using only two I/O pins.
How?
With the help of DMA, the I C interface
allows I C communication with minimal CPU
Other I 2 C
m aster
Other I 2 C
slave
I 2 C
EEPROM
2
2
the MCU to wait for data on the I C-bus with
The I C module provides an interface between the MCU and a serial I C-bus. It is capable of acting as
The interface provided to software by the I C module, allows both fine-grained control of the transmission
intervention. Address recognition is available
in all energy modes (except EM4), allowing
2
sub-μA current consumption.
15.1 Introduction
2 2
both a master and a slave, and supports multi-master buses. Both 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.
2
process and close to automatic transfers. Automatic recognition of slave addresses is provided in all
energy modes.
15.2 Features
? True multi-master capability
? Support for different bus speeds
? Standard-mode (Sm) bitrate up to 100 kbit/s
? Fast-mode (Fm) bitrate up to 400 kbit/s
? Fast-mode Plus (Fm+) bitrate 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
? 10-bit address support
? Error handling
? Clock low timeout
? Clock high timeout
? Arbitration lost
? Bus error detection
? Double buffered data
? Full DMA support
2011-04-12 - d0001_Rev1.10
144
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