UM0851 datasheet(79/245 Pages) STMICROELECTRONICS

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UM0851

Communication device drivers

Doc ID 16604 Rev 2

79/245

I2C uses only two bidirectional lines, serial data (SDA) and serial clock (SCL), pulled up with

resistors. Typical voltages used are +5 V or +3.3 V, but systems with, higher or lower

voltages are permitted too.

The I2C controller serves as an interface between the APB bus and the serial I2C bus. It

provides master functions, and controls all I2C bus-specific sequencing, protocol, arbitration

and timing.

Features supported by I2C are:

●

Two-wire I2C serial interface

●

Three speeds: standard mode (100 Kb/s), fast mode (400 Kb/s), high-speed mode (3.4

Mb/s)

●

Master or slave I2C operation

●

7- or 10-bit addressing

●

Slave bulk transfer mode

●

Interrupt or polled-mode operation

●

Simple software interface consistent with design ware APB peripherals

●

Digital filter for the received SDA and SCL lines

●

Component parameters for configurable software driver support

●

DMA handshaking interface compatible with the arm PL080 DMA controller (refer to

Section 6.2: General purpose DMA (DMAC) driver.

Figure 19.

I2C hardware architecture

4.5.2

Software overview

The following figure illustrates the Linux I2C subsystem. It shows the role of the I2C

framework which interfaces the I2C bus driver (below) to the I2C specific device drivers

(above).

APB

IC_Clock

Reset_Clock

DMA interface

I2C controller

SDA

SCA

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