1 Kernel driver ltc2945 2 ===================== 3 4 Supported chips: 5 6 * Linear Technology LTC2945 7 8 Prefix: 'ltc2945' 9 10 Addresses scanned: - 11 12 Datasheet: 13 14 https://www.analog.com/media/en/technical-documentation/data-sheets/2945fb.pdf 15 16 Author: Guenter Roeck <linux@roeck-us.net> 17 18 19 Description 20 ----------- 21 22 The LTC2945 is a rail-to-rail system monitor that measures current, voltage, 23 and power consumption. 24 25 26 Usage Notes 27 ----------- 28 29 This driver does not probe for LTC2945 devices, since there is no register 30 which can be safely used to identify the chip. You will have to instantiate 31 the devices explicitly. 32 33 Example: the following will load the driver for an LTC2945 at address 0x10 34 on I2C bus #1:: 35 36 $ modprobe ltc2945 37 $ echo ltc2945 0x10 > /sys/bus/i2c/devices/i2c-1/new_device 38 39 40 Sysfs entries 41 ------------- 42 43 Voltage readings provided by this driver are reported as obtained from the ADC 44 registers. If a set of voltage divider resistors is installed, calculate the 45 real voltage by multiplying the reported value with (R1+R2)/R2, where R1 is the 46 value of the divider resistor against the measured voltage and R2 is the value 47 of the divider resistor against Ground. 48 49 Current reading provided by this driver is reported as obtained from the ADC 50 Current Sense register. The reported value assumes that a 1 mOhm sense resistor 51 is installed. If a different sense resistor is installed, calculate the real 52 current by dividing the reported value by the sense resistor value in mOhm. 53 54 ======================= ======================================================== 55 in1_input VIN voltage (mV). Voltage is measured either at 56 SENSE+ or VDD pin depending on chip configuration. 57 in1_min Undervoltage threshold 58 in1_max Overvoltage threshold 59 in1_lowest Lowest measured voltage 60 in1_highest Highest measured voltage 61 in1_reset_history Write 1 to reset in1 history 62 in1_min_alarm Undervoltage alarm 63 in1_max_alarm Overvoltage alarm 64 65 in2_input ADIN voltage (mV) 66 in2_min Undervoltage threshold 67 in2_max Overvoltage threshold 68 in2_lowest Lowest measured voltage 69 in2_highest Highest measured voltage 70 in2_reset_history Write 1 to reset in2 history 71 in2_min_alarm Undervoltage alarm 72 in2_max_alarm Overvoltage alarm 73 74 curr1_input SENSE current (mA) 75 curr1_min Undercurrent threshold 76 curr1_max Overcurrent threshold 77 curr1_lowest Lowest measured current 78 curr1_highest Highest measured current 79 curr1_reset_history Write 1 to reset curr1 history 80 curr1_min_alarm Undercurrent alarm 81 curr1_max_alarm Overcurrent alarm 82 83 power1_input Power (in uW). Power is calculated based on SENSE+/VDD 84 voltage or ADIN voltage depending on chip configuration. 85 power1_min Low lower threshold 86 power1_max High power threshold 87 power1_input_lowest Historical minimum power use 88 power1_input_highest Historical maximum power use 89 power1_reset_history Write 1 to reset power1 history 90 power1_min_alarm Low power alarm 91 power1_max_alarm High power alarm 92 ======================= ========================================================
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.