1 Kernel driver lm77
2 ==================
3
4 Supported chips:
5
6 * National Semiconductor LM77
7
8 Prefix: 'lm77'
9
10 Addresses scanned: I2C 0x48 - 0x4b
11
12 Datasheet: Publicly available at the Natio
13
14 http://www.national.com/
15
16
17 Author: Andras BALI <drewie@freemail.hu>
18
19 Description
20 -----------
21
22 The LM77 implements one temperature sensor. Th
23 sensor incorporates a band-gap type temperatur
24 10-bit ADC, and a digital comparator with user
25 and lower limit values.
26
27 The LM77 implements 3 limits: low (temp1_min),
28 critical (temp1_crit.) It also implements an h
29 applies to all 3 limits. The relative differen
30 register on the chip, which means that the rel
31 the limit and its hysteresis is always the sam
32
33 This implementation detail implies the followi
34
35 * When setting a limit, its hysteresis will au
36 difference staying unchanged. For example, i
37 was 80 degrees C, and the hysteresis was 75
38 the critical limit to 90 degrees C, then the
39 automatically change to 85 degrees C.
40 * All 3 hysteresis can't be set independently.
41 temp1_crit_hyst writable, while temp1_min_hy
42 read-only. Setting temp1_crit_hyst writes th
43 temp1_crit_hyst and temp1_crit into the chip
44 hysteresis applies automatically to the low
45 * The limits should be set before the hysteres
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