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TOMOYO Linux Cross Reference
Linux/Documentation/hwmon/tmp421.rst

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  1 Kernel driver tmp421
  2 ====================
  3 
  4 Supported chips:
  5 
  6   * Texas Instruments TMP421
  7 
  8     Prefix: 'tmp421'
  9 
 10     Addresses scanned: I2C 0x2a, 0x4c, 0x4d, 0x4e and 0x4f
 11 
 12     Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html
 13 
 14   * Texas Instruments TMP422
 15 
 16     Prefix: 'tmp422'
 17 
 18     Addresses scanned: I2C 0x4c, 0x4d, 0x4e and 0x4f
 19 
 20     Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html
 21 
 22   * Texas Instruments TMP423
 23 
 24     Prefix: 'tmp423'
 25 
 26     Addresses scanned: I2C 0x4c and 0x4d
 27 
 28     Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp421.html
 29 
 30   * Texas Instruments TMP441
 31 
 32     Prefix: 'tmp441'
 33 
 34     Addresses scanned: I2C 0x2a, 0x4c, 0x4d, 0x4e and 0x4f
 35 
 36     Datasheet: https://www.ti.com/product/tmp441
 37 
 38   * Texas Instruments TMP442
 39 
 40     Prefix: 'tmp442'
 41 
 42     Addresses scanned: I2C 0x4c and 0x4d
 43 
 44     Datasheet: https://www.ti.com/product/tmp442
 45 
 46 Authors:
 47 
 48         Andre Prendel <andre.prendel@gmx.de>
 49 
 50 Description
 51 -----------
 52 
 53 This driver implements support for Texas Instruments TMP421, TMP422,
 54 TMP423, TMP441, and TMP442 temperature sensor chips. These chips
 55 implement one local and up to one (TMP421, TMP441), up to two (TMP422,
 56 TMP442) or up to three (TMP423) remote sensors. Temperature is measured
 57 in degrees Celsius. The chips are wired over I2C/SMBus and specified
 58 over a temperature range of -40 to +125 degrees Celsius. Resolution
 59 for both the local and remote channels is 0.0625 degree C.
 60 
 61 The chips support only temperature measurement. The driver exports
 62 the temperature values via the following sysfs files:
 63 
 64 **temp[1-4]_input**
 65 
 66 **temp[2-4]_fault**
 67 
 68 Each sensor can be individually disabled via Devicetree or from sysfs
 69 via:
 70 
 71 **temp[1-4]_enable**
 72 
 73 If labels were specified in Devicetree, additional sysfs files will
 74 be present:
 75 
 76 **temp[1-4]_label**
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