1 .. SPDX-License-Identifier: GPL-2.0 1 .. SPDX-License-Identifier: GPL-2.0
2 2
3 Kernel driver sht4x 3 Kernel driver sht4x
4 =================== 4 ===================
5 5
6 Supported Chips: 6 Supported Chips:
7 7
8 * Sensirion SHT4X 8 * Sensirion SHT4X
9 9
10 Prefix: 'sht4x' 10 Prefix: 'sht4x'
11 11
12 Addresses scanned: None 12 Addresses scanned: None
13 13
14 Datasheet: 14 Datasheet:
15 15
16 English: https://www.sensirion.com/filea 16 English: https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/2_Humidity_Sensors/Datasheets/Sensirion_Humidity_Sensors_SHT4x_Datasheet.pdf
17 17
18 Author: Navin Sankar Velliangiri <navin@linumiz 18 Author: Navin Sankar Velliangiri <navin@linumiz.com>
19 19
20 20
21 Description 21 Description
22 ----------- 22 -----------
23 23
24 This driver implements support for the Sensiri 24 This driver implements support for the Sensirion SHT4x chip, a humidity
25 and temperature sensor. Temperature is measure 25 and temperature sensor. Temperature is measured in degree celsius, relative
26 humidity is expressed as a percentage. In sysf 26 humidity is expressed as a percentage. In sysfs interface, all values are
27 scaled by 1000, i.e. the value for 31.5 degree 27 scaled by 1000, i.e. the value for 31.5 degrees celsius is 31500.
28 28
29 Usage Notes 29 Usage Notes
30 ----------- 30 -----------
31 31
32 The device communicates with the I2C protocol. 32 The device communicates with the I2C protocol. Sensors can have the I2C
33 address 0x44. See Documentation/i2c/instantiat 33 address 0x44. See Documentation/i2c/instantiating-devices.rst for methods
34 to instantiate the device. 34 to instantiate the device.
35 35
36 Sysfs entries 36 Sysfs entries
37 ------------- 37 -------------
38 38
39 =============== ============================== 39 =============== ============================================
40 temp1_input Measured temperature in millid !! 40 temp1_input Measured temperature in millidegrees Celcius
41 humidity1_input Measured humidity in %H 41 humidity1_input Measured humidity in %H
42 update_interval The minimum interval for polli 42 update_interval The minimum interval for polling the sensor,
43 in milliseconds. Writable. Mus 43 in milliseconds. Writable. Must be at least
44 2000. 44 2000.
45 =============== ============================== 45 =============== ============================================
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