Kernel driver ltc2990

Supported chips:

Author:

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 tomeasure current through a series resistor, or a temperature with an externaldiode.

Usage Notes

This driver does not probe for PMBus devices. You will have to instantiatedevices explicitly.

Sysfs attributes

in0_inputVoltage at Vcc pin in millivolt (range 2.5V to 5V)
temp1_inputInternal chip temperature in millidegrees Celsius

A subset of the following attributes are visible, depending on the measurementmode of the chip.

in[1-4]_inputVoltage at V[1-4] pin in millivolt
temp2_inputExternal temperature sensor TR1 in millidegrees Celsius
temp3_inputExternal temperature sensor TR2 in millidegrees Celsius
curr1_inputCurrent in mA across V1-V2 assuming a 1mOhm sense resistor
curr2_inputCurrent in mA across V3-V4 assuming a 1mOhm sense resistor

The “curr*_input” measurements actually report the voltage drop across theinput pins in microvolts. This is equivalent to the current through a 1mOhmsense resistor. Divide the reported value by the actual sense resistor valuein mOhm to get the actual value.