1 Kernel driver ltc2990 2 ===================== 3 4 5 Supported chips: 6 7 * Linear Technology LTC2990 8 9 Prefix: 'ltc2990' 10 11 Addresses scanned: - 12 13 Datasheet: http://www.linear.com/product/ltc2990 14 15 16 17 Author: 18 19 - Mike Looijmans <mike.looijmans@topic.nl> 20 - Tom Levens <tom.levens@cern.ch> 21 22 23 Description 24 ----------- 25 26 LTC2990 is a Quad I2C Voltage, Current and Temperature Monitor. 27 The chip's inputs can measure 4 voltages, or two inputs together (1+2 and 3+4) 28 can be combined to measure a differential voltage, which is typically used to 29 measure current through a series resistor, or a temperature with an external 30 diode. 31 32 33 Usage Notes 34 ----------- 35 36 This driver does not probe for PMBus devices. You will have to instantiate 37 devices explicitly. 38 39 40 Sysfs attributes 41 ---------------- 42 43 ============= ================================================== 44 in0_input Voltage at Vcc pin in millivolt (range 2.5V to 5V) 45 temp1_input Internal chip temperature in millidegrees Celsius 46 ============= ================================================== 47 48 A subset of the following attributes are visible, depending on the measurement 49 mode of the chip. 50 51 ============= ========================================================== 52 in[1-4]_input Voltage at V[1-4] pin in millivolt 53 temp2_input External temperature sensor TR1 in millidegrees Celsius 54 temp3_input External temperature sensor TR2 in millidegrees Celsius 55 curr1_input Current in mA across V1-V2 assuming a 1mOhm sense resistor 56 curr2_input Current in mA across V3-V4 assuming a 1mOhm sense resistor 57 ============= ========================================================== 58 59 The "curr*_input" measurements actually report the voltage drop across the 60 input pins in microvolts. This is equivalent to the current through a 1mOhm 61 sense resistor. Divide the reported value by the actual sense resistor value 62 in mOhm to get the actual value.
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