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Diffstat (limited to 'Documentation/hwmon/sht3x.rst')
| -rw-r--r-- | Documentation/hwmon/sht3x.rst | 56 |
1 files changed, 40 insertions, 16 deletions
diff --git a/Documentation/hwmon/sht3x.rst b/Documentation/hwmon/sht3x.rst index 95a850d5b2c1..9585fa7c5a5d 100644 --- a/Documentation/hwmon/sht3x.rst +++ b/Documentation/hwmon/sht3x.rst @@ -9,7 +9,19 @@ Supported chips: Addresses scanned: none - Datasheet: https://www.sensirion.com/file/datasheet_sht3x_digital + Datasheets: + - https://sensirion.com/media/documents/213E6A3B/63A5A569/Datasheet_SHT3x_DIS.pdf + - https://sensirion.com/media/documents/051DF50B/639C8101/Sensirion_Humidity_and_Temperature_Sensors_Datasheet_SHT33.pdf + + * Sensirion STS3x-DIS + + Prefix: 'sts3x' + + Addresses scanned: none + + Datasheets: + - https://sensirion.com/media/documents/1DA31AFD/61641F76/Sensirion_Temperature_Sensors_STS3x_Datasheet.pdf + - https://sensirion.com/media/documents/292A335C/65537BAF/Sensirion_Datasheet_STS32_STS33.pdf Author: @@ -19,24 +31,18 @@ Author: Description ----------- -This driver implements support for the Sensirion SHT3x-DIS chip, a humidity -and temperature sensor. Temperature is measured in degrees celsius, relative -humidity is expressed as a percentage. In the sysfs interface, all values are -scaled by 1000, i.e. the value for 31.5 degrees celsius is 31500. +This driver implements support for the Sensirion SHT3x-DIS and STS3x-DIS +series of humidity and temperature sensors. Temperature is measured in degrees +celsius, relative humidity is expressed as a percentage. In the sysfs interface, +all values are scaled by 1000, i.e. the value for 31.5 degrees celsius is 31500. The device communicates with the I2C protocol. Sensors can have the I2C -addresses 0x44 or 0x45, depending on the wiring. See -Documentation/i2c/instantiating-devices.rst for methods to instantiate the device. - -There are two options configurable by means of sht3x_platform_data: +addresses 0x44 or 0x45 (0x4a or 0x4b for sts3x), depending on the wiring. See +Documentation/i2c/instantiating-devices.rst for methods to instantiate the +device. -1. blocking (pull the I2C clock line down while performing the measurement) or - non-blocking mode. Blocking mode will guarantee the fastest result but - the I2C bus will be busy during that time. By default, non-blocking mode - is used. Make sure clock-stretching works properly on your device if you - want to use blocking mode. -2. high or low accuracy. High accuracy is used by default and using it is - strongly recommended. +Even if sht3x sensor supports clock-stretch (blocking mode) and non-stretch +(non-blocking mode) in single-shot mode, this driver only supports the latter. The sht3x sensor supports a single shot mode as well as 5 periodic measure modes, which can be controlled with the update_interval sysfs interface. @@ -59,6 +65,10 @@ When the temperature and humidity readings move back between the hysteresis values, the alert bit is set to 0 and the alert pin on the sensor is set to low. +The serial number exposed to debugfs allows for unique identification of the +sensors. For sts32, sts33 and sht33, the manufacturer provides calibration +certificates through an API. + sysfs-Interface --------------- @@ -85,4 +95,18 @@ heater_enable: heater enable, heating element removes excess humidity from update_interval: update interval, 0 for single shot, interval in msec for periodic measurement. If the interval is not supported by the sensor, the next faster interval is chosen +repeatability: write or read repeatability, higher repeatability means + longer measurement duration, lower noise level and + larger energy consumption: + + - 0: low repeatability + - 1: medium repeatability + - 2: high repeatability +=================== ============================================================ + +debugfs-Interface +----------------- + +=================== ============================================================ +serial_number: unique serial number of the sensor in decimal =================== ============================================================ |