1 .. SPDX-License-Identifier: GPL-2.0-or-later 2 3 Kernel driver ChipCap2 4 ====================== 5 6 Supported chips: 7 8 * Amphenol CC2D23, CC2D23S, CC2D25, CC2D25S, CC2D33, CC2D33S, CC2D35, CC2D35S 9 10 Prefix: 'chipcap2' 11 12 Addresses scanned: - 13 14 Datasheet: https://www.amphenol-sensors.com/en/telaire/humidity/527-humidity-sensors/3095-chipcap-2 15 16 Author: 17 18 - Javier Carrasco <javier.carrasco.cruz@gmail.com> 19 20 Description 21 ----------- 22 23 This driver implements support for the Amphenol ChipCap 2, a humidity and 24 temperature chip family. Temperature is measured in milli degrees celsius, 25 relative humidity is expressed as a per cent mille. The measurement ranges 26 are the following: 27 28 - Relative humidity: 0 to 100000 pcm (14-bit resolution) 29 - Temperature: -40000 to +125000 m°C (14-bit resolution) 30 31 The device communicates with the I2C protocol and uses the I2C address 0x28 32 by default. 33 34 Depending on the hardware configuration, up to two humidity alarms to control 35 minimum and maximum values are provided. Their thresholds and hystersis can be 36 configured via sysfs. 37 38 Thresholds and hysteris must be provided as a per cent mille. These values 39 might be truncated to match the 14-bit device resolution (6.1 pcm/LSB) 40 41 Known Issues 42 ------------ 43 44 The driver does not support I2C address and command window length modification. 45 46 sysfs-Interface 47 --------------- 48 49 The following list includes the sysfs attributes that the driver always provides, 50 their permissions and a short description: 51 52 =============================== ======= ======================================== 53 Name Perm Description 54 =============================== ======= ======================================== 55 temp1_input: RO temperature input 56 humidity1_input: RO humidity input 57 =============================== ======= ======================================== 58 59 The following list includes the sysfs attributes that the driver may provide 60 depending on the hardware configuration: 61 62 =============================== ======= ======================================== 63 Name Perm Description 64 =============================== ======= ======================================== 65 humidity1_min: RW humidity low limit. Measurements under 66 this limit trigger a humidity low alarm 67 humidity1_max: RW humidity high limit. Measurements above 68 this limit trigger a humidity high alarm 69 humidity1_min_hyst: RW humidity low hystersis 70 humidity1_max_hyst: RW humidity high hystersis 71 humidity1_min_alarm: RO humidity low alarm indicator 72 humidity1_max_alarm: RO humidity high alarm indicator 73 =============================== ======= ========================================
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