Commit | Line | Data |
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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. |