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- Kernel driver sht15
- ===================
- Authors:
- * Wouter Horre
- * Jonathan Cameron
- * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
- * Jerome Oufella <jerome.oufella@savoirfairelinux.com>
- Supported chips:
- * Sensirion SHT10
- Prefix: 'sht10'
- * Sensirion SHT11
- Prefix: 'sht11'
- * Sensirion SHT15
- Prefix: 'sht15'
- * Sensirion SHT71
- Prefix: 'sht71'
- * Sensirion SHT75
- Prefix: 'sht75'
- Datasheet: Publicly available at the Sensirion website
- http://www.sensirion.ch/en/pdf/product_information/Datasheet-humidity-sensor-SHT1x.pdf
- Description
- -----------
- The SHT10, SHT11, SHT15, SHT71, and SHT75 are humidity and temperature
- sensors.
- The devices communicate using two GPIO lines.
- Supported resolutions for the measurements are 14 bits for temperature and 12
- bits for humidity, or 12 bits for temperature and 8 bits for humidity.
- The humidity calibration coefficients are programmed into an OTP memory on the
- chip. These coefficients are used to internally calibrate the signals from the
- sensors. Disabling the reload of those coefficients allows saving 10ms for each
- measurement and decrease power consumption, while losing on precision.
- Some options may be set directly in the sht15_platform_data structure
- or via sysfs attributes.
- Notes:
- * The regulator supply name is set to "vcc".
- * If a CRC validation fails, a soft reset command is sent, which resets
- status register to its hardware default value, but the driver will try to
- restore the previous device configuration.
- Platform data
- -------------
- * checksum:
- set it to true to enable CRC validation of the readings (default to false).
- * no_otp_reload:
- flag to indicate not to reload from OTP (default to false).
- * low_resolution:
- flag to indicate the temp/humidity resolution to use (default to false).
- Sysfs interface
- ---------------
- * temp1_input: temperature input
- * humidity1_input: humidity input
- * heater_enable: write 1 in this attribute to enable the on-chip heater,
- 0 to disable it. Be careful not to enable the heater
- for too long.
- * temp1_fault: if 1, this means that the voltage is low (below 2.47V) and
- measurement may be invalid.
- * humidity1_fault: same as temp1_fault.
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