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Alexander Steinfffd80c2011-06-28 15:11:23 +00001Kernel driver lm95245
2==================
3
4Supported 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
11Author: Alexander Stein <alexander.stein@systec-electronic.com>
12
13Description
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15
16The LM95245 is an 11-bit digital temperature sensor with a 2-wire System
17Management Bus (SMBus) interface and TruTherm technology that can monitor
18the temperature of a remote diode as well as its own temperature.
19The LM95245 can be used to very accurately monitor the temperature of
20external devices such as microprocessors.
21
22All temperature values are given in millidegrees Celsius. Local temperature
23is given within a range of -127 to +127.875 degrees. Remote temperatures are
24given within a range of -127 to +255 degrees. Resolution depends on
25temperature input and range.
26
Guenter Roecka41a8922014-02-22 08:17:34 -080027Each sensor has its own critical limit. Additionally, there is a relative
28hysteresis value common to both critical limits. To make life easier to
29user-space applications, two absolute values are exported, one for each
30channel, but these values are of course linked. Only the local hysteresis
31can be set from user-space, and the same delta applies to the remote
32hysteresis.
Alexander Steinfffd80c2011-06-28 15:11:23 +000033
34The lm95245 driver can change its update interval to a fixed set of values.
35It will round up to the next selectable interval. See the datasheet for exact
36values. Reading sensor values more often will do no harm, but will return
37'old' values.