linux-stable/Documentation/hwmon/aht10.rst
Kirill Yatsenko d2abcb5cc8 hwmon: (aht10) Add support for compatible aht20
Add support for compatible AHT20 temperature/humidity sensor. The only
difference between the two is that AHT20 has additional crc8 byte.

It seems like AHT15 is also supported by the driver but it wasn't
verified and tested yet.

Tested on Beaglebone black rev C.

Signed-off-by: Kirill Yatsenko <kiriyatsenko@gmail.com>
Link: https://lore.kernel.org/r/20230524201912.815993-1-kiriyatsenko@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2023-06-08 06:41:18 -07:00

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.. SPDX-License-Identifier: GPL-2.0
Kernel driver aht10
=====================
Supported chips:
* Aosong AHT10/AHT20
Prefix: 'aht10'
Addresses scanned: None
Datasheet(AHT10):
Chinese: http://www.aosong.com/userfiles/files/media/AHT10%E4%BA%A7%E5%93%81%E6%89%8B%E5%86%8C%20A3%2020201210.pdf
English: https://server4.eca.ir/eshop/AHT10/Aosong_AHT10_en_draft_0c.pdf
Datasheet(AHT20):
English: http://www.aosong.com/userfiles/files/media/Data%20Sheet%20AHT20.pdf
Author: Johannes Cornelis Draaijer <jcdra1@gmail.com>
Description
-----------
The AHT10/AHT20 is a Temperature and Humidity sensor
The address of this i2c device may only be 0x38
Special Features
----------------
AHT20 has additional CRC8 support which is sent as the last byte of the sensor
values.
Usage Notes
-----------
This driver does not probe for AHT10/ATH20 devices, as there is no reliable
way to determine if an i2c chip is or isn't an AHT10/AHT20. The device has
to be instantiated explicitly with the address 0x38. See
Documentation/i2c/instantiating-devices.rst for details.
Sysfs entries
-------------
=============== ============================================
temp1_input Measured temperature in millidegrees Celsius
humidity1_input Measured humidity in %H
update_interval The minimum interval for polling the sensor,
in milliseconds. Writable. Must be at
least 2000.
=============== ============================================