projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| fffd80cc AS |
1 | Kernel driver lm95245 |
| 2 | ================== | |
| 3 | ||
| 4 | Supported chips: | |
| 5 | * National Semiconductor LM95245 | |
| 6 | Addresses scanned: I2C 0x18, 0x19, 0x29, 0x4c, 0x4d | |
| 7 | Datasheet: Publicly available at the National Semiconductor website | |
| 8 | http://www.national.com/mpf/LM/LM95245.html | |
| 9 | ||
| 10 | ||
| 11 | Author: Alexander Stein <alexander.stein@systec-electronic.com> | |
| 12 | ||
| 13 | Description | |
| 14 | ----------- | |
| 15 | ||
| 16 | The LM95245 is an 11-bit digital temperature sensor with a 2-wire System | |
| 17 | Management Bus (SMBus) interface and TruTherm technology that can monitor | |
| 18 | the temperature of a remote diode as well as its own temperature. | |
| 19 | The LM95245 can be used to very accurately monitor the temperature of | |
| 20 | external devices such as microprocessors. | |
| 21 | ||
| 22 | All temperature values are given in millidegrees Celsius. Local temperature | |
| 23 | is given within a range of -127 to +127.875 degrees. Remote temperatures are | |
| 24 | given within a range of -127 to +255 degrees. Resolution depends on | |
| 25 | temperature input and range. | |
| 26 | ||
| 27 | Each sensor has its own critical limit, but the hysteresis is common to all | |
| 28 | two channels. | |
| 29 | ||
| 30 | The lm95245 driver can change its update interval to a fixed set of values. | |
| 31 | It will round up to the next selectable interval. See the datasheet for exact | |
| 32 | values. Reading sensor values more often will do no harm, but will return | |
| 33 | 'old' values. |