1 Kernel driver w83l785ts 1 Kernel driver w83l785ts
2 ======================= 2 =======================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * Winbond W83L785TS-S 6 * Winbond W83L785TS-S
7 7
8 Prefix: 'w83l785ts' 8 Prefix: 'w83l785ts'
9 9
10 Addresses scanned: I2C 0x2e 10 Addresses scanned: I2C 0x2e
11 11
12 Datasheet: Publicly available at the Winbo 12 Datasheet: Publicly available at the Winbond USA website
13 13
14 http://www.winbond-usa.com/prod 14 http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf
15 15
16 Authors: 16 Authors:
17 Jean Delvare <jdelvare@suse.de> 17 Jean Delvare <jdelvare@suse.de>
18 18
19 Description 19 Description
20 ----------- 20 -----------
21 21
22 The W83L785TS-S is a digital temperature senso 22 The W83L785TS-S is a digital temperature sensor. It senses the
23 temperature of a single external diode. The hi 23 temperature of a single external diode. The high limit is
24 theoretically defined as 85 or 100 degrees C t 24 theoretically defined as 85 or 100 degrees C through a combination
25 of external resistors, so the user cannot chan 25 of external resistors, so the user cannot change it. Values seen so
26 far suggest that the two possible limits are a 26 far suggest that the two possible limits are actually 95 and 110
27 degrees C. The datasheet is rather poor and ob 27 degrees C. The datasheet is rather poor and obviously inaccurate
28 on several points including this one. 28 on several points including this one.
29 29
30 All temperature values are given in degrees Ce 30 All temperature values are given in degrees Celsius. Resolution
31 is 1.0 degree. See the datasheet for details. 31 is 1.0 degree. See the datasheet for details.
32 32
33 The w83l785ts driver will not update its value 33 The w83l785ts driver will not update its values more frequently than
34 every other second; reading them more often wi 34 every other second; reading them more often will do no harm, but will
35 return 'old' values. 35 return 'old' values.
36 36
37 Known Issues 37 Known Issues
38 ------------ 38 ------------
39 39
40 On some systems (Asus), the BIOS is known to i 40 On some systems (Asus), the BIOS is known to interfere with the driver
41 and cause read errors. Or maybe the W83L785TS- 41 and cause read errors. Or maybe the W83L785TS-S chip is simply unreliable,
42 we don't really know. The driver will retry a 42 we don't really know. The driver will retry a given number of times
43 (5 by default) and then give up, returning the 43 (5 by default) and then give up, returning the old value (or 0 if
44 there is no old value). It seems to work well 44 there is no old value). It seems to work well enough so that you should
45 not notice anything. Thanks to James Bolt for 45 not notice anything. Thanks to James Bolt for helping test this feature.
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