| Kernel driver ltc2990 |
| ===================== |
| |
| |
| Supported chips: |
| |
| * Linear Technology LTC2990 |
| |
| Prefix: 'ltc2990' |
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| Addresses scanned: - |
| |
| Datasheet: http://www.linear.com/product/ltc2990 |
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| |
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| Author: |
| |
| - Mike Looijmans <mike.looijmans@topic.nl> |
| - Tom Levens <tom.levens@cern.ch> |
| |
| |
| Description |
| ----------- |
| |
| LTC2990 is a Quad I2C Voltage, Current and Temperature Monitor. |
| The chip's inputs can measure 4 voltages, or two inputs together (1+2 and 3+4) |
| can be combined to measure a differential voltage, which is typically used to |
| measure current through a series resistor, or a temperature with an external |
| diode. |
| |
| |
| Usage Notes |
| ----------- |
| |
| This driver does not probe for PMBus devices. You will have to instantiate |
| devices explicitly. |
| |
| |
| Sysfs attributes |
| ---------------- |
| |
| ============= ================================================== |
| in0_input Voltage at Vcc pin in millivolt (range 2.5V to 5V) |
| temp1_input Internal chip temperature in millidegrees Celsius |
| ============= ================================================== |
| |
| A subset of the following attributes are visible, depending on the measurement |
| mode of the chip. |
| |
| ============= ========================================================== |
| in[1-4]_input Voltage at V[1-4] pin in millivolt |
| temp2_input External temperature sensor TR1 in millidegrees Celsius |
| temp3_input External temperature sensor TR2 in millidegrees Celsius |
| curr1_input Current in mA across V1-V2 assuming a 1mOhm sense resistor |
| curr2_input Current in mA across V3-V4 assuming a 1mOhm sense resistor |
| ============= ========================================================== |
| |
| The "curr*_input" measurements actually report the voltage drop across the |
| input pins in microvolts. This is equivalent to the current through a 1mOhm |
| sense resistor. Divide the reported value by the actual sense resistor value |
| in mOhm to get the actual value. |
