0001 Kernel driver ltc2945
0002 =====================
0003
0004 Supported chips:
0005
0006 * Linear Technology LTC2945
0007
0008 Prefix: 'ltc2945'
0009
0010 Addresses scanned: -
0011
0012 Datasheet:
0013
0014 https://www.analog.com/media/en/technical-documentation/data-sheets/2945fb.pdf
0015
0016 Author: Guenter Roeck <linux@roeck-us.net>
0017
0018
0019 Description
0020 -----------
0021
0022 The LTC2945 is a rail-to-rail system monitor that measures current, voltage,
0023 and power consumption.
0024
0025
0026 Usage Notes
0027 -----------
0028
0029 This driver does not probe for LTC2945 devices, since there is no register
0030 which can be safely used to identify the chip. You will have to instantiate
0031 the devices explicitly.
0032
0033 Example: the following will load the driver for an LTC2945 at address 0x10
0034 on I2C bus #1::
0035
0036 $ modprobe ltc2945
0037 $ echo ltc2945 0x10 > /sys/bus/i2c/devices/i2c-1/new_device
0038
0039
0040 Sysfs entries
0041 -------------
0042
0043 Voltage readings provided by this driver are reported as obtained from the ADC
0044 registers. If a set of voltage divider resistors is installed, calculate the
0045 real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the
0046 value of the divider resistor against the measured voltage and R2 is the value
0047 of the divider resistor against Ground.
0048
0049 Current reading provided by this driver is reported as obtained from the ADC
0050 Current Sense register. The reported value assumes that a 1 mOhm sense resistor
0051 is installed. If a different sense resistor is installed, calculate the real
0052 current by dividing the reported value by the sense resistor value in mOhm.
0053
0054 ======================= ========================================================
0055 in1_input VIN voltage (mV). Voltage is measured either at
0056 SENSE+ or VDD pin depending on chip configuration.
0057 in1_min Undervoltage threshold
0058 in1_max Overvoltage threshold
0059 in1_lowest Lowest measured voltage
0060 in1_highest Highest measured voltage
0061 in1_reset_history Write 1 to reset in1 history
0062 in1_min_alarm Undervoltage alarm
0063 in1_max_alarm Overvoltage alarm
0064
0065 in2_input ADIN voltage (mV)
0066 in2_min Undervoltage threshold
0067 in2_max Overvoltage threshold
0068 in2_lowest Lowest measured voltage
0069 in2_highest Highest measured voltage
0070 in2_reset_history Write 1 to reset in2 history
0071 in2_min_alarm Undervoltage alarm
0072 in2_max_alarm Overvoltage alarm
0073
0074 curr1_input SENSE current (mA)
0075 curr1_min Undercurrent threshold
0076 curr1_max Overcurrent threshold
0077 curr1_lowest Lowest measured current
0078 curr1_highest Highest measured current
0079 curr1_reset_history Write 1 to reset curr1 history
0080 curr1_min_alarm Undercurrent alarm
0081 curr1_max_alarm Overcurrent alarm
0082
0083 power1_input Power (in uW). Power is calculated based on SENSE+/VDD
0084 voltage or ADIN voltage depending on chip configuration.
0085 power1_min Low lower threshold
0086 power1_max High power threshold
0087 power1_input_lowest Historical minimum power use
0088 power1_input_highest Historical maximum power use
0089 power1_reset_history Write 1 to reset power1 history
0090 power1_min_alarm Low power alarm
0091 power1_max_alarm High power alarm
0092 ======================= ========================================================
