1 Kernel drivers ltc2947-i2c and ltc2947-spi 2 ========================================== 3 4 Supported chips: 5 6 * Analog Devices LTC2947 7 8 Prefix: 'ltc2947' 9 10 Addresses scanned: - 11 12 Datasheet: 13 14 https://www.analog.com/media/en/technical-documentation/data-sheets/LTC2947.pdf 15 16 Author: Nuno Sá <nuno.sa@analog.com> 17 18 Description 19 ___________ 20 21 The LTC2947 is a high precision power and energy monitor that measures current, 22 voltage, power, temperature, charge and energy. The device supports both SPI 23 and I2C depending on the chip configuration. 24 The device also measures accumulated quantities as energy. It has two banks of 25 register's to read/set energy related values. These banks can be configured 26 independently to have setups like: energy1 accumulates always and enrgy2 only 27 accumulates if current is positive (to check battery charging efficiency for 28 example). The device also supports a GPIO pin that can be configured as output 29 to control a fan as a function of measured temperature. Then, the GPIO becomes 30 active as soon as a temperature reading is higher than a defined threshold. The 31 temp2 channel is used to control this thresholds and to read the respective 32 alarms. 33 34 Sysfs entries 35 _____________ 36 37 The following attributes are supported. Limits are read-write, reset_history 38 is write-only and all the other attributes are read-only. 39 40 ======================= ========================================== 41 in0_input VP-VM voltage (mV). 42 in0_min Undervoltage threshold 43 in0_max Overvoltage threshold 44 in0_lowest Lowest measured voltage 45 in0_highest Highest measured voltage 46 in0_reset_history Write 1 to reset in1 history 47 in0_min_alarm Undervoltage alarm 48 in0_max_alarm Overvoltage alarm 49 in0_label Channel label (VP-VM) 50 51 in1_input DVCC voltage (mV) 52 in1_min Undervoltage threshold 53 in1_max Overvoltage threshold 54 in1_lowest Lowest measured voltage 55 in1_highest Highest measured voltage 56 in1_reset_history Write 1 to reset in2 history 57 in1_min_alarm Undervoltage alarm 58 in1_max_alarm Overvoltage alarm 59 in1_label Channel label (DVCC) 60 61 curr1_input IP-IM Sense current (mA) 62 curr1_min Undercurrent threshold 63 curr1_max Overcurrent threshold 64 curr1_lowest Lowest measured current 65 curr1_highest Highest measured current 66 curr1_reset_history Write 1 to reset curr1 history 67 curr1_min_alarm Undercurrent alarm 68 curr1_max_alarm Overcurrent alarm 69 curr1_label Channel label (IP-IM) 70 71 power1_input Power (in uW) 72 power1_min Low power threshold 73 power1_max High power threshold 74 power1_input_lowest Historical minimum power use 75 power1_input_highest Historical maximum power use 76 power1_reset_history Write 1 to reset power1 history 77 power1_min_alarm Low power alarm 78 power1_max_alarm High power alarm 79 power1_label Channel label (Power) 80 81 temp1_input Chip Temperature (in milliC) 82 temp1_min Low temperature threshold 83 temp1_max High temperature threshold 84 temp1_input_lowest Historical minimum temperature use 85 temp1_input_highest Historical maximum temperature use 86 temp1_reset_history Write 1 to reset temp1 history 87 temp1_min_alarm Low temperature alarm 88 temp1_max_alarm High temperature alarm 89 temp1_label Channel label (Ambient) 90 91 temp2_min Low temperature threshold for fan control 92 temp2_max High temperature threshold for fan control 93 temp2_min_alarm Low temperature fan control alarm 94 temp2_max_alarm High temperature fan control alarm 95 temp2_label Channel label (TEMPFAN) 96 97 energy1_input Measured energy over time (in microJoule) 98 99 energy2_input Measured energy over time (in microJoule) 100 ======================= ==========================================
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