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Commit | Line | Data |
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df922703 ML |
1 | Kernel driver ltc2990 |
2 | ===================== | |
3 | ||
4 | Supported chips: | |
5 | * Linear Technology LTC2990 | |
6 | Prefix: 'ltc2990' | |
7 | Addresses scanned: - | |
8 | Datasheet: http://www.linear.com/product/ltc2990 | |
9 | ||
10 | Author: Mike Looijmans <mike.looijmans@topic.nl> | |
11 | ||
12 | ||
13 | Description | |
14 | ----------- | |
15 | ||
16 | LTC2990 is a Quad I2C Voltage, Current and Temperature Monitor. | |
17 | The chip's inputs can measure 4 voltages, or two inputs together (1+2 and 3+4) | |
18 | can be combined to measure a differential voltage, which is typically used to | |
19 | measure current through a series resistor, or a temperature. | |
20 | ||
21 | This driver currently uses the 2x differential mode only. In order to support | |
22 | other modes, the driver will need to be expanded. | |
23 | ||
24 | ||
25 | Usage Notes | |
26 | ----------- | |
27 | ||
28 | This driver does not probe for PMBus devices. You will have to instantiate | |
29 | devices explicitly. | |
30 | ||
31 | ||
32 | Sysfs attributes | |
33 | ---------------- | |
34 | ||
35 | The "curr*_input" measurements actually report the voltage drop across the | |
36 | input pins in microvolts. This is equivalent to the current through a 1mOhm | |
37 | sense resistor. Divide the reported value by the actual sense resistor value | |
38 | in mOhm to get the actual value. | |
39 | ||
40 | in0_input Voltage at Vcc pin in millivolt (range 2.5V to 5V) | |
41 | temp1_input Internal chip temperature in millidegrees Celcius | |
42 | curr1_input Current in mA across v1-v2 assuming a 1mOhm sense resistor. | |
43 | curr2_input Current in mA across v3-v4 assuming a 1mOhm sense resistor. |