| 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> |
| |
| |
| 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. |
| |
| This driver currently uses the 2x differential mode only. In order to support |
| other modes, the driver will need to be expanded. |
| |
| |
| Usage Notes |
| ----------- |
| |
| This driver does not probe for PMBus devices. You will have to instantiate |
| devices explicitly. |
| |
| |
| Sysfs attributes |
| ---------------- |
| |
| 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. |
| |
| in0_input Voltage at Vcc pin in millivolt (range 2.5V to 5V) |
| temp1_input Internal chip temperature 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. |
