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I2CDETECT(8)							  I2CDETECT(8)

NAME
       i2cdetect - detect I2C chips

SYNOPSIS
       i2cdetect [-y] [-a] [-q|-r] i2cbus [first last]
       i2cdetect -F i2cbus
       i2cdetect -V
       i2cdetect -l


DESCRIPTION
       i2cdetect  is  a	 userspace  program to scan an I2C bus for devices. It
       outputs a table with the list of detected devices on the specified bus.
       i2cbus  indicates  the  number of the I2C bus to be scanned, and should
       correspond to one of the busses listed by i2cdetect -l.	 The  optional
       parameters  first  and  last restrict the scanning range (default: from
       0x03 to 0x77).

       i2cdetect can also be used to query the functionalities of an  I2C  bus
       (see option -F.)

WARNING
       This program can confuse your I2C bus, cause data loss and worse!

INTERPRETING THE OUTPUT
       Each  cell  in  the output table will contain one of the following sym‐
       bols:

       · "--". The address was probed but no chip answered.

       · "UU". Probing was skipped, because this address is currently  in  use
	 by  a	driver.	 This  strongly	 suggests that there is a chip at this
	 address.

       · An address number in hexadecimal, e.g. "2d" or "4e". A chip was found
	 at this address.

OPTIONS
       -y     Disable  interactive mode. By default, i2cdetect will wait for a
	      confirmation from the user before messing with the I2C bus. When
	      this  flag is used, it will perform the operation directly. This
	      is mainly meant to be used in scripts.

       -a     Force scanning of non-regular addresses. Not recommended.

       -q     Use SMBus "quick write" commands for probing  (by	 default,  the
	      command  used  is	 the  one  believed  to be the safest for each
	      address).	 Not recommended. This is known to corrupt  the	 Atmel
	      AT24RF08 EEPROM found on many IBM Thinkpad laptops.

       -r     Use SMBus "read byte" commands for probing (by default, the com‐
	      mand used is  the	 one  believed	to  be	the  safest  for  each
	      address).	 Not recommended. This is known to lock SMBus on vari‐
	      ous write-only chips (most notably clock chips at address 0x69).

       -F     Display the list of functionalities implemented by  the  adapter
	      and exit.

       -V     Display the version and exit.

       -l     Output a list of installed busses.

SEE ALSO
       i2cdump(8), sensors-detect(8)

AUTHOR
       Frodo   Looijaard,   Mark  D.  Studebaker,  and	the  lm_sensors	 group
       http://www.lm-sensors.org/ This manual page  was	 written  by  Aurelien
       Jarno  <aurel32@debian.org>,  for  the  Debian GNU/Linux system. It was
       then reviewed by the lm_sensors team and is now part of the  lm_sensors
       source distribution.

				 October 2006			  I2CDETECT(8)

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