1 Kernel driver lm80
2 ==================
3
4 Supported chips:
5
6 * National Semiconductor LM80
7
8 Prefix: 'lm80'
9
10 Addresses scanned: I2C 0x28 - 0x2f
11
12 Datasheet: Publicly available at the Natio
13
14 http://www.national.com/
15
16 * National Semiconductor LM96080
17
18 Prefix: 'lm96080'
19
20 Addresses scanned: I2C 0x28 - 0x2f
21
22 Datasheet: Publicly available at the Natio
23
24 http://www.national.com/
25
26
27 Authors:
28 - Frodo Looijaard <frodol@dds.nl>,
29 - Philip Edelbrock <phil@netroedge.com>
30
31 Description
32 -----------
33
34 This driver implements support for the Nationa
35 It is described as a 'Serial Interface ACPI-Co
36 System Hardware Monitor'. The LM96080 is a mor
37 it is pin and register compatible, with a few
38 yet supported by the driver.
39
40 The LM80 implements one temperature sensor, tw
41 seven voltage sensors, alarms, and some miscel
42
43 Temperatures are measured in degrees Celsius.
44 which operate independently. When the HOT Temp
45 this will cause an alarm that will be reassert
46 drops below the HOT Hysteresis. The Overtemper
47 should work in the same way (but this must be
48 is unclear about this). Measurements are guara
49 +125 degrees. The current temperature measurem
50 0.0625 degrees; the limits have a resolution o
51
52 Fan rotation speeds are reported in RPM (rotat
53 triggered if the rotation speed has dropped be
54 readings can be divided by a programmable divi
55 the readings more range or accuracy. Not all R
56 represented, so some rounding is done. With a
57 representable value is around 2600 RPM.
58
59 Voltage sensors (also known as IN sensors) rep
60 An alarm is triggered if the voltage has cross
61 or maximum limit. Note that minimum in this ca
62 zero'; this is important for negative voltage
63 inputs can measure voltages between 0 and 2.55
64 of 0.01 volt.
65
66 If an alarm triggers, it will remain triggered
67 is read at least once. This means that the cau
68 already have disappeared! Note that in the cur
69 hardware registers are read whenever any data
70 than 2.0 seconds since the last update). This
71 miss once-only alarms.
72
73 The LM80 only updates its values each 1.5 seco
74 will do no harm, but will return 'old' values.
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