| Kernel driver ltc2990 | |
| ===================== | |
| Supported chips: | |
| * Linear Technology LTC2990 | |
| Prefix: 'ltc2990' | |
| Addresses scanned: - | |
| Datasheet: http://www.linear.com/product/ltc2990 | |
| 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 Celcius | |
| 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 Celcius | |
| temp3_input External temperature sensor TR2 in millidegrees Celcius | |
| 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. |