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- Kernel driver ltc2945
- =====================
- Supported chips:
- * Linear Technology LTC2945
- Prefix: 'ltc2945'
- Addresses scanned: -
- Datasheet:
- http://cds.linear.com/docs/en/datasheet/2945fa.pdf
- Author: Guenter Roeck <linux@roeck-us.net>
- Description
- -----------
- The LTC2945 is a rail-to-rail system monitor that measures current, voltage,
- and power consumption.
- Usage Notes
- -----------
- This driver does not probe for LTC2945 devices, since there is no register
- which can be safely used to identify the chip. You will have to instantiate
- the devices explicitly.
- Example: the following will load the driver for an LTC2945 at address 0x10
- on I2C bus #1:
- $ modprobe ltc2945
- $ echo ltc2945 0x10 > /sys/bus/i2c/devices/i2c-1/new_device
- Sysfs entries
- -------------
- Voltage readings provided by this driver are reported as obtained from the ADC
- registers. If a set of voltage divider resistors is installed, calculate the
- real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the
- value of the divider resistor against the measured voltage and R2 is the value
- of the divider resistor against Ground.
- Current reading provided by this driver is reported as obtained from the ADC
- Current Sense register. The reported value assumes that a 1 mOhm sense resistor
- is installed. If a different sense resistor is installed, calculate the real
- current by dividing the reported value by the sense resistor value in mOhm.
- in1_input VIN voltage (mV). Voltage is measured either at
- SENSE+ or VDD pin depending on chip configuration.
- in1_min Undervoltage threshold
- in1_max Overvoltage threshold
- in1_lowest Lowest measured voltage
- in1_highest Highest measured voltage
- in1_reset_history Write 1 to reset in1 history
- in1_min_alarm Undervoltage alarm
- in1_max_alarm Overvoltage alarm
- in2_input ADIN voltage (mV)
- in2_min Undervoltage threshold
- in2_max Overvoltage threshold
- in2_lowest Lowest measured voltage
- in2_highest Highest measured voltage
- in2_reset_history Write 1 to reset in2 history
- in2_min_alarm Undervoltage alarm
- in2_max_alarm Overvoltage alarm
- curr1_input SENSE current (mA)
- curr1_min Undercurrent threshold
- curr1_max Overcurrent threshold
- curr1_lowest Lowest measured current
- curr1_highest Highest measured current
- curr1_reset_history Write 1 to reset curr1 history
- curr1_min_alarm Undercurrent alarm
- curr1_max_alarm Overcurrent alarm
- power1_input Power (in uW). Power is calculated based on SENSE+/VDD
- voltage or ADIN voltage depending on chip configuration.
- power1_min Low lower threshold
- power1_max High power threshold
- power1_input_lowest Historical minimum power use
- power1_input_highest Historical maximum power use
- power1_reset_history Write 1 to reset power1 history
- power1_min_alarm Low power alarm
- power1_max_alarm High power alarm
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