NAME    [Toc]    [Back]

     iic - Inter IC (I2C) bus

SYNOPSIS    [Toc]    [Back]

     iic* at gscsio?

DESCRIPTION    [Toc]    [Back]

     I2C is a two-wire bus developed by Philips used for connecting integrated
     circuits.   It  is commonly used for connecting devices such
as EEPROMs,
     temperature  sensors,  fan  controllers,  real-time  clocks,
tuners, and other
     types of integrated circuits.

     The iic driver provides a uniform programming interface layer between I2C
     master controllers and various I2C slave devices.  Each  I2C
master controller
 attaches an iic framework; several slave devices can
then be attached
 to the iic bus.

     All I2C slave devices are uniquely identified by the address
on the bus.
     The  master accesses a particular slave device using its address.  Device
     addresses should be specified in  the  kernel  configuration
file with the
     addr locator.

     System  Management Bus (SMBus) protocol is also supported by
emulating it
     with the I2C commands.

SUPPORTED DEVICES    [Toc]    [Back]

     Master controllers
           gscsio(4)
                 National Semiconductor Geode  SC1100  Super  I/O
ACCESS.bus

     Slave devices
           lmtemp(4)
                 National   Semiconductor  LM75/LM77  temperature
sensor

SEE ALSO    [Toc]    [Back]

     gscsio(4), intro(4), lmtemp(4), iic(9)

HISTORY    [Toc]    [Back]

     The I2C framework first appeared  in  NetBSD  2.0.   OpenBSD
support was
     added in OpenBSD 3.6.

AUTHORS    [Toc]    [Back]

     The I2C framework was written by Steve C. Woodford and Jason
R. Thorpe
     for NetBSD and then ported to OpenBSD by Alexander Yurchenko
     <[email protected]>.

OpenBSD      3.6                           May      15,      2004