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- Kernel driver ltc2990
- =====================
- Supported chips:
- * Linear Technology LTC2990
- Prefix: 'ltc2990'
- Addresses scanned: -
- Datasheet: http://www.linear.com/product/ltc2990
- Author:
- - Mike Looijmans <[email protected]>
- - Tom Levens <[email protected]>
- 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.
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