1 Kernel driver lm95234 1 Kernel driver lm95234
2 ===================== 2 =====================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * National Semiconductor / Texas Instruments 6 * National Semiconductor / Texas Instruments LM95233
7 7
8 Addresses scanned: I2C 0x18, 0x2a, 0x2b 8 Addresses scanned: I2C 0x18, 0x2a, 0x2b
9 9
10 Datasheet: Publicly available at the Texas 10 Datasheet: Publicly available at the Texas Instruments website
11 11
12 https://www.ti.com/product/lm95 12 https://www.ti.com/product/lm95233
13 13
14 * National Semiconductor / Texas Instruments 14 * National Semiconductor / Texas Instruments LM95234
15 15
16 Addresses scanned: I2C 0x18, 0x4d, 0x4e 16 Addresses scanned: I2C 0x18, 0x4d, 0x4e
17 17
18 Datasheet: Publicly available at the Texas 18 Datasheet: Publicly available at the Texas Instruments website
19 19
20 https://www.ti.com/product/lm95 20 https://www.ti.com/product/lm95234
21 21
22 Author: Guenter Roeck <linux@roeck-us.net> 22 Author: Guenter Roeck <linux@roeck-us.net>
23 23
24 Description 24 Description
25 ----------- 25 -----------
26 26
27 LM95233 and LM95234 are 11-bit digital tempera 27 LM95233 and LM95234 are 11-bit digital temperature sensors with a 2-wire
28 System Management Bus (SMBus) interface and Tr 28 System Management Bus (SMBus) interface and TrueTherm technology
29 that can very accurately monitor the temperatu 29 that can very accurately monitor the temperature of two (LM95233)
30 or four (LM95234) remote diodes as well as its 30 or four (LM95234) remote diodes as well as its own temperature.
31 The remote diodes can be external devices such 31 The remote diodes can be external devices such as microprocessors,
32 graphics processors or diode-connected 2N3904s 32 graphics processors or diode-connected 2N3904s. The chip's TruTherm
33 beta compensation technology allows sensing of 33 beta compensation technology allows sensing of 90 nm or 65 nm process
34 thermal diodes accurately. 34 thermal diodes accurately.
35 35
36 All temperature values are given in millidegre 36 All temperature values are given in millidegrees Celsius. Temperature
37 is provided within a range of -127 to +255 deg 37 is provided within a range of -127 to +255 degrees (+127.875 degrees for
38 the internal sensor). Resolution depends on te 38 the internal sensor). Resolution depends on temperature input and range.
39 39
40 Each sensor has its own maximum limit, but the 40 Each sensor has its own maximum limit, but the hysteresis is common to all
41 channels. The hysteresis is configurable with 41 channels. The hysteresis is configurable with the tem1_max_hyst attribute and
42 affects the hysteresis on all channels. The fi 42 affects the hysteresis on all channels. The first two external sensors also
43 have a critical limit. 43 have a critical limit.
44 44
45 The lm95234 driver can change its update inter 45 The lm95234 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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