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authorUrs Fleisch <urs.fleisch@gmail.com>2011-01-07 07:15:39 +0000
committerGuenter Roeck <guenter.roeck@ericsson.com>2011-01-08 10:56:28 -0800
commit430400b86304ea729ba10f2966a8af67da60a37f (patch)
tree79abaa76d689a40923167103582bb11e69fd096c /Documentation/hwmon
parentc6c2c1636e30bcd26c6b0d208324055a03c5ab9c (diff)
hwmon: driver for Sensirion SHT21 humidity and temperature sensor
Signed-off-by: Urs Fleisch <urs.fleisch@sensirion.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
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+Kernel driver sht21
+===================
+
+Supported chips:
+ * Sensirion SHT21
+ Prefix: 'sht21'
+ Addresses scanned: none
+ Datasheet: Publicly available at the Sensirion website
+ http://www.sensirion.com/en/pdf/product_information/Datasheet-humidity-sensor-SHT21.pdf
+
+ * Sensirion SHT25
+ Prefix: 'sht21'
+ Addresses scanned: none
+ Datasheet: Publicly available at the Sensirion website
+ http://www.sensirion.com/en/pdf/product_information/Datasheet-humidity-sensor-SHT25.pdf
+
+Author:
+ Urs Fleisch <urs.fleisch@sensirion.com>
+
+Description
+-----------
+
+The SHT21 and SHT25 are humidity and temperature sensors in a DFN package of
+only 3 x 3 mm footprint and 1.1 mm height. The difference between the two
+devices is the higher level of precision of the SHT25 (1.8% relative humidity,
+0.2 degree Celsius) compared with the SHT21 (2.0% relative humidity,
+0.3 degree Celsius).
+
+The devices communicate with the I2C protocol. All sensors are set to the same
+I2C address 0x40, so an entry with I2C_BOARD_INFO("sht21", 0x40) can be used
+in the board setup code.
+
+sysfs-Interface
+---------------
+
+temp1_input - temperature input
+humidity1_input - humidity input
+
+Notes
+-----
+
+The driver uses the default resolution settings of 12 bit for humidity and 14
+bit for temperature, which results in typical measurement times of 22 ms for
+humidity and 66 ms for temperature. To keep self heating below 0.1 degree
+Celsius, the device should not be active for more than 10% of the time,
+e.g. maximum two measurements per second at the given resolution.
+
+Different resolutions, the on-chip heater, using the CRC checksum and reading
+the serial number are not supported yet.