1 Kernel driver da9055
2 ====================
3
4 Supported chips:
5 * Dialog Semiconductors DA9055 PMIC
6
7 Prefix: 'da9055'
8
9 Datasheet: Datasheet is not publicly avail
10
11 Authors: David Dajun Chen <dchen@diasemi.com>
12
13 Description
14 -----------
15
16 The DA9055 provides an Analogue to Digital Con
17 resolution and track and hold circuitry combin
18 multiplexer. The analogue input multiplexer wi
19 different inputs. The track and hold circuit e
20 the input of the ADC during the conversion.
21
22 The ADC is used to measure the following input
23
24 - Channel 0: VDDOUT - measurement of the syste
25 - Channel 1: ADC_IN1 - high impedance input (0
26 - Channel 2: ADC_IN2 - high impedance input (0
27 - Channel 3: ADC_IN3 - high impedance input (0
28 - Channel 4: Internal Tjunc. - sense (internal
29
30 By using sysfs attributes we can measure the s
31 chip junction temperature and auxiliary channe
32
33 Voltage Monitoring
34 ------------------
35
36 Voltages are sampled in a AUTO mode it can be
37 are stored in a 10 bit ADC.
38
39 The system voltage is calculated as:
40
41 Milli volt = ((ADC value * 1000) / 85)
42
43 The voltages on ADC channels 1, 2 and 3 are ca
44
45 Milli volt = (ADC value * 1000) / 102
46
47 Temperature Monitoring
48 ----------------------
49
50 Temperatures are sampled by a 10 bit ADC. Jun
51 are monitored by the ADC channels.
52
53 The junction temperature is calculated:
54
55 Degrees celsius = -0.4084 * (ADC_RES -
56
57 The junction temperature attribute is supporte
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