| 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 <nuno.sa@analog.com> |
| |
| 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) |
| ======================= ========================================== |
