linux/Documentation/hwmon/sht15
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   1Kernel driver sht15
   2===================
   3
   4Authors:
   5  * Wouter Horre
   6  * Jonathan Cameron
   7  * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
   8  * Jerome Oufella <jerome.oufella@savoirfairelinux.com>
   9
  10Supported chips:
  11  * Sensirion SHT10
  12    Prefix: 'sht10'
  13
  14  * Sensirion SHT11
  15    Prefix: 'sht11'
  16
  17  * Sensirion SHT15
  18    Prefix: 'sht15'
  19
  20  * Sensirion SHT71
  21    Prefix: 'sht71'
  22
  23  * Sensirion SHT75
  24    Prefix: 'sht75'
  25
  26Datasheet: Publicly available at the Sensirion website
  27http://www.sensirion.ch/en/pdf/product_information/Datasheet-humidity-sensor-SHT1x.pdf
  28
  29Description
  30-----------
  31
  32The SHT10, SHT11, SHT15, SHT71, and SHT75 are humidity and temperature
  33sensors.
  34
  35The devices communicate using two GPIO lines.
  36
  37Supported resolutions for the measurements are 14 bits for temperature and 12
  38bits for humidity, or 12 bits for temperature and 8 bits for humidity.
  39
  40The humidity calibration coefficients are programmed into an OTP memory on the
  41chip. These coefficients are used to internally calibrate the signals from the
  42sensors. Disabling the reload of those coefficients allows saving 10ms for each
  43measurement and decrease power consumption, while loosing on precision.
  44
  45Some options may be set directly in the sht15_platform_data structure
  46or via sysfs attributes.
  47
  48Notes:
  49  * The regulator supply name is set to "vcc".
  50  * If a CRC validation fails, a soft reset command is sent, which resets
  51    status register to its hardware default value, but the driver will try to
  52    restore the previous device configuration.
  53
  54Platform data
  55-------------
  56
  57* checksum:
  58  set it to true to enable CRC validation of the readings (default to false).
  59* no_otp_reload:
  60  flag to indicate not to reload from OTP (default to false).
  61* low_resolution:
  62  flag to indicate the temp/humidity resolution to use (default to false).
  63
  64Sysfs interface
  65---------------
  66
  67* temp1_input:     temperature input
  68* humidity1_input: humidity input
  69* heater_enable:   write 1 in this attribute to enable the on-chip heater,
  70                   0 to disable it. Be careful not to enable the heater
  71                   for too long.
  72* temp1_fault:     if 1, this means that the voltage is low (below 2.47V) and
  73                   measurement may be invalid.
  74* humidity1_fault: same as temp1_fault.
  75
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