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100 lines
3.5 KiB
100 lines
3.5 KiB
Kernel drivers ltc2947-i2c and ltc2947-spi |
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Supported chips: |
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* Analog Devices LTC2947 |
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Prefix: 'ltc2947' |
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Addresses scanned: - |
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Datasheet: |
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https://www.analog.com/media/en/technical-documentation/data-sheets/LTC2947.pdf |
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Author: Nuno Sá <[email protected]> |
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Description |
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The LTC2947 is a high precision power and energy monitor that measures current, |
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voltage, power, temperature, charge and energy. The device supports both SPI |
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and I2C depending on the chip configuration. |
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The device also measures accumulated quantities as energy. It has two banks of |
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register's to read/set energy related values. These banks can be configured |
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independently to have setups like: energy1 accumulates always and enrgy2 only |
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accumulates if current is positive (to check battery charging efficiency for |
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example). The device also supports a GPIO pin that can be configured as output |
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to control a fan as a function of measured temperature. Then, the GPIO becomes |
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active as soon as a temperature reading is higher than a defined threshold. The |
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temp2 channel is used to control this thresholds and to read the respective |
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alarms. |
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Sysfs entries |
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_____________ |
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The following attributes are supported. Limits are read-write, reset_history |
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is write-only and all the other attributes are read-only. |
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======================= ========================================== |
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in0_input VP-VM voltage (mV). |
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in0_min Undervoltage threshold |
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in0_max Overvoltage threshold |
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in0_lowest Lowest measured voltage |
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in0_highest Highest measured voltage |
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in0_reset_history Write 1 to reset in1 history |
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in0_min_alarm Undervoltage alarm |
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in0_max_alarm Overvoltage alarm |
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in0_label Channel label (VP-VM) |
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in1_input DVCC voltage (mV) |
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in1_min Undervoltage threshold |
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in1_max Overvoltage threshold |
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in1_lowest Lowest measured voltage |
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in1_highest Highest measured voltage |
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in1_reset_history Write 1 to reset in2 history |
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in1_min_alarm Undervoltage alarm |
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in1_max_alarm Overvoltage alarm |
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in1_label Channel label (DVCC) |
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curr1_input IP-IM Sense current (mA) |
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curr1_min Undercurrent threshold |
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curr1_max Overcurrent threshold |
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curr1_lowest Lowest measured current |
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curr1_highest Highest measured current |
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curr1_reset_history Write 1 to reset curr1 history |
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curr1_min_alarm Undercurrent alarm |
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curr1_max_alarm Overcurrent alarm |
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curr1_label Channel label (IP-IM) |
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power1_input Power (in uW) |
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power1_min Low power threshold |
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power1_max High power threshold |
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power1_input_lowest Historical minimum power use |
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power1_input_highest Historical maximum power use |
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power1_reset_history Write 1 to reset power1 history |
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power1_min_alarm Low power alarm |
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power1_max_alarm High power alarm |
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power1_label Channel label (Power) |
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temp1_input Chip Temperature (in milliC) |
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temp1_min Low temperature threshold |
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temp1_max High temperature threshold |
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temp1_input_lowest Historical minimum temperature use |
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temp1_input_highest Historical maximum temperature use |
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temp1_reset_history Write 1 to reset temp1 history |
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temp1_min_alarm Low temperature alarm |
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temp1_max_alarm High temperature alarm |
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temp1_label Channel label (Ambient) |
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temp2_min Low temperature threshold for fan control |
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temp2_max High temperature threshold for fan control |
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temp2_min_alarm Low temperature fan control alarm |
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temp2_max_alarm High temperature fan control alarm |
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temp2_label Channel label (TEMPFAN) |
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energy1_input Measured energy over time (in microJoule) |
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energy2_input Measured energy over time (in microJoule) |
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======================= ==========================================
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