| R.Marek@sh.cvut.cz | 7f15b66 | 2005-05-26 12:42:19 +0000 | [diff] [blame] | 1 | Kernel driver w83l785ts |
| 2 | ======================= |
| 3 | |
| 4 | Supported chips: |
| 5 | * Winbond W83L785TS-S |
| 6 | Prefix: 'w83l785ts' |
| 7 | Addresses scanned: I2C 0x2e |
| 8 | Datasheet: Publicly available at the Winbond USA website |
| 9 | http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W83L785TS-S.pdf |
| 10 | |
| 11 | Authors: |
| 12 | Jean Delvare <khali@linux-fr.org> |
| 13 | |
| 14 | Description |
| 15 | ----------- |
| 16 | |
| 17 | The W83L785TS-S is a digital temperature sensor. It senses the |
| 18 | temperature of a single external diode. The high limit is |
| 19 | theoretically defined as 85 or 100 degrees C through a combination |
| 20 | of external resistors, so the user cannot change it. Values seen so |
| 21 | far suggest that the two possible limits are actually 95 and 110 |
| 22 | degrees C. The datasheet is rather poor and obviously inaccurate |
| 23 | on several points including this one. |
| 24 | |
| 25 | All temperature values are given in degrees Celsius. Resolution |
| 26 | is 1.0 degree. See the datasheet for details. |
| 27 | |
| 28 | The w83l785ts driver will not update its values more frequently than |
| 29 | every other second; reading them more often will do no harm, but will |
| 30 | return 'old' values. |
| 31 | |
| 32 | Known Issues |
| 33 | ------------ |
| 34 | |
| 35 | On some systems (Asus), the BIOS is known to interfere with the driver |
| Jean Delvare | 4040c41 | 2008-02-12 11:17:26 +0100 | [diff] [blame] | 36 | and cause read errors. Or maybe the W83L785TS-S chip is simply unreliable, |
| 37 | we don't really know. The driver will retry a given number of times |
| R.Marek@sh.cvut.cz | 7f15b66 | 2005-05-26 12:42:19 +0000 | [diff] [blame] | 38 | (5 by default) and then give up, returning the old value (or 0 if |
| 39 | there is no old value). It seems to work well enough so that you should |
| 40 | not notice anything. Thanks to James Bolt for helping test this feature. |