Documentation/hwmon/sht15

   1 Kernel driver sht15
   2 ===================
   3
   4 Authors:
   5   * Wouter Horre
   6   * Jonathan Cameron
   7   * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
   8   * Jerome Oufella <jerome.oufella@savoirfairelinux.com>
   9
  10 Supported 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
  26 Datasheet: Publicly available at the Sensirion website
  27 http://www.sensirion.ch/en/pdf/product_information/Datasheet-humidity-sensor-SHT1x.pdf
  28
  29 Description
  30 -----------
  31
  32 The SHT10, SHT11, SHT15, SHT71, and SHT75 are humidity and temperature
  33 sensors.
  34
  35 The devices communicate using two GPIO lines.
  36
  37 Supported resolutions for the measurements are 14 bits for temperature and 12
  38 bits for humidity, or 12 bits for temperature and 8 bits for humidity.
  39
  40 The humidity calibration coefficients are programmed into an OTP memory on the
  41 chip. These coefficients are used to internally calibrate the signals from the
  42 sensors. Disabling the reload of those coefficients allows saving 10ms for each
  43 measurement and decrease power consumption, while losing on precision.
  44
  45 Some options may be set directly in the sht15_platform_data structure
  46 or via sysfs attributes.
  47
  48 Notes:
  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
  54 Platform 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
  64 Sysfs 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.