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Commit | Line | Data |
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df922703 ML |
1 | Kernel driver ltc2990 |
2 | ===================== | |
3 | ||
b04f2f7d | 4 | |
df922703 | 5 | Supported chips: |
b04f2f7d | 6 | |
df922703 | 7 | * Linear Technology LTC2990 |
b04f2f7d | 8 | |
df922703 | 9 | Prefix: 'ltc2990' |
b04f2f7d | 10 | |
df922703 | 11 | Addresses scanned: - |
b04f2f7d | 12 | |
df922703 ML |
13 | Datasheet: http://www.linear.com/product/ltc2990 |
14 | ||
b04f2f7d MCC |
15 | |
16 | ||
17 | Author: | |
18 | ||
19 | - Mike Looijmans <mike.looijmans@topic.nl> | |
20 | - Tom Levens <tom.levens@cern.ch> | |
df922703 ML |
21 | |
22 | ||
23 | Description | |
24 | ----------- | |
25 | ||
26 | LTC2990 is a Quad I2C Voltage, Current and Temperature Monitor. | |
27 | The chip's inputs can measure 4 voltages, or two inputs together (1+2 and 3+4) | |
28 | can be combined to measure a differential voltage, which is typically used to | |
5d9ca430 TL |
29 | measure current through a series resistor, or a temperature with an external |
30 | diode. | |
df922703 ML |
31 | |
32 | ||
33 | Usage Notes | |
34 | ----------- | |
35 | ||
36 | This driver does not probe for PMBus devices. You will have to instantiate | |
37 | devices explicitly. | |
38 | ||
39 | ||
40 | Sysfs attributes | |
41 | ---------------- | |
42 | ||
b04f2f7d | 43 | ============= ================================================== |
5d9ca430 | 44 | in0_input Voltage at Vcc pin in millivolt (range 2.5V to 5V) |
b04f2f7d MCC |
45 | temp1_input Internal chip temperature in millidegrees Celsius |
46 | ============= ================================================== | |
5d9ca430 TL |
47 | |
48 | A subset of the following attributes are visible, depending on the measurement | |
49 | mode of the chip. | |
50 | ||
b04f2f7d | 51 | ============= ========================================================== |
5d9ca430 | 52 | in[1-4]_input Voltage at V[1-4] pin in millivolt |
b04f2f7d MCC |
53 | temp2_input External temperature sensor TR1 in millidegrees Celsius |
54 | temp3_input External temperature sensor TR2 in millidegrees Celsius | |
5d9ca430 TL |
55 | curr1_input Current in mA across V1-V2 assuming a 1mOhm sense resistor |
56 | curr2_input Current in mA across V3-V4 assuming a 1mOhm sense resistor | |
b04f2f7d | 57 | ============= ========================================================== |
5d9ca430 | 58 | |
df922703 ML |
59 | The "curr*_input" measurements actually report the voltage drop across the |
60 | input pins in microvolts. This is equivalent to the current through a 1mOhm | |
61 | sense resistor. Divide the reported value by the actual sense resistor value | |
62 | in mOhm to get the actual value. |