63 lines
1.8 KiB
ReStructuredText
63 lines
1.8 KiB
ReStructuredText
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Kernel driver ltc2990
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=====================
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Supported chips:
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* Linear Technology LTC2990
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Prefix: 'ltc2990'
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Addresses scanned: -
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Datasheet: http://www.linear.com/product/ltc2990
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Author:
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- Mike Looijmans <mike.looijmans@topic.nl>
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- Tom Levens <tom.levens@cern.ch>
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Description
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-----------
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LTC2990 is a Quad I2C Voltage, Current and Temperature Monitor.
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The chip's inputs can measure 4 voltages, or two inputs together (1+2 and 3+4)
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can be combined to measure a differential voltage, which is typically used to
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measure current through a series resistor, or a temperature with an external
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diode.
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Usage Notes
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-----------
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This driver does not probe for PMBus devices. You will have to instantiate
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devices explicitly.
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Sysfs attributes
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----------------
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============= ==================================================
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in0_input Voltage at Vcc pin in millivolt (range 2.5V to 5V)
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temp1_input Internal chip temperature in millidegrees Celsius
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============= ==================================================
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A subset of the following attributes are visible, depending on the measurement
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mode of the chip.
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============= ==========================================================
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in[1-4]_input Voltage at V[1-4] pin in millivolt
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temp2_input External temperature sensor TR1 in millidegrees Celsius
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temp3_input External temperature sensor TR2 in millidegrees Celsius
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curr1_input Current in mA across V1-V2 assuming a 1mOhm sense resistor
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curr2_input Current in mA across V3-V4 assuming a 1mOhm sense resistor
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============= ==========================================================
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The "curr*_input" measurements actually report the voltage drop across the
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input pins in microvolts. This is equivalent to the current through a 1mOhm
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sense resistor. Divide the reported value by the actual sense resistor value
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in mOhm to get the actual value.
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