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diff --git a/Documentation/hwmon/ltc2990.rst b/Documentation/hwmon/ltc2990.rst new file mode 100644 index 0000000000..e0a369e679 --- /dev/null +++ b/Documentation/hwmon/ltc2990.rst @@ -0,0 +1,62 @@ +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 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. |