| Kernel driver adt7410 | |
| ===================== | |
| Supported chips: | |
| * Analog Devices ADT7410 | |
| Prefix: 'adt7410' | |
| Addresses scanned: None | |
| Datasheet: Publicly available at the Analog Devices website | |
| http://www.analog.com/static/imported-files/data_sheets/ADT7410.pdf | |
| * Analog Devices ADT7420 | |
| Prefix: 'adt7420' | |
| Addresses scanned: None | |
| Datasheet: Publicly available at the Analog Devices website | |
| http://www.analog.com/static/imported-files/data_sheets/ADT7420.pdf | |
| Author: Hartmut Knaack <knaack.h@gmx.de> | |
| Description | |
| ----------- | |
| The ADT7410 is a temperature sensor with rated temperature range of -55°C to | |
| +150°C. It has a high accuracy of +/-0.5°C and can be operated at a resolution | |
| of 13 bits (0.0625°C) or 16 bits (0.0078°C). The sensor provides an INT pin to | |
| indicate that a minimum or maximum temperature set point has been exceeded, as | |
| well as a critical temperature (CT) pin to indicate that the critical | |
| temperature set point has been exceeded. Both pins can be set up with a common | |
| hysteresis of 0°C - 15°C and a fault queue, ranging from 1 to 4 events. Both | |
| pins can individually set to be active-low or active-high, while the whole | |
| device can either run in comparator mode or interrupt mode. The ADT7410 | |
| supports continous temperature sampling, as well as sampling one temperature | |
| value per second or even justget one sample on demand for power saving. | |
| Besides, it can completely power down its ADC, if power management is | |
| required. | |
| The ADT7420 is register compatible, the only differences being the package, | |
| a slightly narrower operating temperature range (-40°C to +150°C), and a | |
| better accuracy (0.25°C instead of 0.50°C.) | |
| Configuration Notes | |
| ------------------- | |
| Since the device uses one hysteresis value, which is an offset to minimum, | |
| maximum and critical temperature, it can only be set for temp#_max_hyst. | |
| However, temp#_min_hyst and temp#_crit_hyst show their corresponding | |
| hysteresis. | |
| The device is set to 16 bit resolution and comparator mode. | |
| sysfs-Interface | |
| --------------- | |
| temp#_input - temperature input | |
| temp#_min - temperature minimum setpoint | |
| temp#_max - temperature maximum setpoint | |
| temp#_crit - critical temperature setpoint | |
| temp#_min_hyst - hysteresis for temperature minimum (read-only) | |
| temp#_max_hyst - hysteresis for temperature maximum (read/write) | |
| temp#_crit_hyst - hysteresis for critical temperature (read-only) | |
| temp#_min_alarm - temperature minimum alarm flag | |
| temp#_max_alarm - temperature maximum alarm flag | |
| temp#_crit_alarm - critical temperature alarm flag |