7 * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
8 * Jerome Oufella <jerome.oufella@savoirfairelinux.com>
26 Datasheet: Publicly available at the Sensirion website
27 http://www.sensirion.ch/en/pdf/product_information/Datasheet-humidity-sensor-SHT1x.pdf
32 The SHT10, SHT11, SHT15, SHT71, and SHT75 are humidity and temperature
35 The devices communicate using two GPIO lines.
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.
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.
45 Some options may be set via sysfs attributes.
48 * The regulator supply name is set to "vcc".
49 * If a CRC validation fails, a soft reset command is sent, which resets
50 status register to its hardware default value, but the driver will try to
51 restore the previous device configuration.
57 set it to true to enable CRC validation of the readings (default to false).
59 flag to indicate not to reload from OTP (default to false).
61 flag to indicate the temp/humidity resolution to use (default to false).
66 * temp1_input: temperature input
67 * humidity1_input: humidity input
68 * heater_enable: write 1 in this attribute to enable the on-chip heater,
69 0 to disable it. Be careful not to enable the heater
71 * temp1_fault: if 1, this means that the voltage is low (below 2.47V) and
72 measurement may be invalid.
73 * humidity1_fault: same as temp1_fault.