1 Kernel driver lm95245 1 Kernel driver lm95245
2 ===================== 2 =====================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * TI LM95235 6 * TI LM95235
7 7
8 Addresses scanned: I2C 0x18, 0x29, 0x4c 8 Addresses scanned: I2C 0x18, 0x29, 0x4c
9 9
10 Datasheet: Publicly available at the TI we 10 Datasheet: Publicly available at the TI website
11 11
12 https://www.ti.com/lit/ds/symli 12 https://www.ti.com/lit/ds/symlink/lm95235.pdf
13 13
14 * TI / National Semiconductor LM95245 14 * TI / National Semiconductor LM95245
15 15
16 Addresses scanned: I2C 0x18, 0x19, 0x29, 0 16 Addresses scanned: I2C 0x18, 0x19, 0x29, 0x4c, 0x4d
17 17
18 Datasheet: Publicly available at the TI we 18 Datasheet: Publicly available at the TI website
19 19
20 https://www.ti.com/lit/ds/symli 20 https://www.ti.com/lit/ds/symlink/lm95245.pdf
21 21
22 Author: Alexander Stein <alexander.stein@systec 22 Author: Alexander Stein <alexander.stein@systec-electronic.com>
23 23
24 Description 24 Description
25 ----------- 25 -----------
26 26
27 LM95235 and LM95245 are 11-bit digital tempera 27 LM95235 and LM95245 are 11-bit digital temperature sensors with a 2-wire System
28 Management Bus (SMBus) interface and TruTherm 28 Management Bus (SMBus) interface and TruTherm technology that can monitor
29 the temperature of a remote diode as well as i 29 the temperature of a remote diode as well as its own temperature.
30 The chips can be used to very accurately monit 30 The chips can be used to very accurately monitor the temperature of
31 external devices such as microprocessors. 31 external devices such as microprocessors.
32 32
33 All temperature values are given in millidegre 33 All temperature values are given in millidegrees Celsius. Local temperature
34 is given within a range of -127 to +127.875 de 34 is given within a range of -127 to +127.875 degrees. Remote temperatures are
35 given within a range of -127 to +255 degrees. 35 given within a range of -127 to +255 degrees. Resolution depends on
36 temperature input and range. 36 temperature input and range.
37 37
38 Each sensor has its own critical limit. Additi 38 Each sensor has its own critical limit. Additionally, there is a relative
39 hysteresis value common to both critical limit 39 hysteresis value common to both critical limits. To make life easier to
40 user-space applications, two absolute values a 40 user-space applications, two absolute values are exported, one for each
41 channel, but these values are of course linked 41 channel, but these values are of course linked. Only the local hysteresis
42 can be set from user-space, and the same delta 42 can be set from user-space, and the same delta applies to the remote
43 hysteresis. 43 hysteresis.
44 44
45 The lm95245 driver can change its update inter 45 The lm95245 driver can change its update interval to a fixed set of values.
46 It will round up to the next selectable interv 46 It will round up to the next selectable interval. See the datasheet for exact
47 values. Reading sensor values more often will 47 values. Reading sensor values more often will do no harm, but will return
48 'old' values. 48 'old' values.
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