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