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