projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 983b97be HK |
1 | Kernel driver adt7410 |
| 2 | ===================== | |
| 3 | ||
| 4 | Supported chips: | |
| 5 | * Analog Devices ADT7410 | |
| 6 | Prefix: 'adt7410' | |
| 7 | Addresses scanned: I2C 0x48 - 0x4B | |
| 8 | Datasheet: Publicly available at the Analog Devices website | |
| 9 | http://www.analog.com/static/imported-files/data_sheets/ADT7410.pdf | |
| 10 | ||
| 11 | Author: Hartmut Knaack <knaack.h@gmx.de> | |
| 12 | ||
| 13 | Description | |
| 14 | ----------- | |
| 15 | ||
| 16 | The ADT7410 is a temperature sensor with rated temperature range of -55°C to | |
| 17 | +150°C. It has a high accuracy of +/-0.5°C and can be operated at a resolution | |
| 18 | of 13 bits (0.0625°C) or 16 bits (0.0078°C). The sensor provides an INT pin to | |
| 19 | indicate that a minimum or maximum temperature set point has been exceeded, as | |
| 20 | well as a critical temperature (CT) pin to indicate that the critical | |
| 21 | temperature set point has been exceeded. Both pins can be set up with a common | |
| 22 | hysteresis of 0°C - 15°C and a fault queue, ranging from 1 to 4 events. Both | |
| 23 | pins can individually set to be active-low or active-high, while the whole | |
| 24 | device can either run in comparator mode or interrupt mode. The ADT7410 | |
| 25 | supports continous temperature sampling, as well as sampling one temperature | |
| 26 | value per second or even justget one sample on demand for power saving. | |
| 27 | Besides, it can completely power down its ADC, if power management is | |
| 28 | required. | |
| 29 | ||
| 30 | Configuration Notes | |
| 31 | ------------------- | |
| 32 | ||
| 33 | Since the device uses one hysteresis value, which is an offset to minimum, | |
| 34 | maximum and critical temperature, it can only be set for temp#_max_hyst. | |
| 35 | However, temp#_min_hyst and temp#_crit_hyst show their corresponding | |
| 36 | hysteresis. | |
| 37 | The device is set to 16 bit resolution and comparator mode. | |
| 38 | ||
| 39 | sysfs-Interface | |
| 40 | --------------- | |
| 41 | ||
| 42 | temp#_input - temperature input | |
| 43 | temp#_min - temperature minimum setpoint | |
| 44 | temp#_max - temperature maximum setpoint | |
| 45 | temp#_crit - critical temperature setpoint | |
| 46 | temp#_min_hyst - hysteresis for temperature minimum (read-only) | |
| 47 | temp#_max_hyst - hysteresis for temperature maximum (read/write) | |
| 48 | temp#_crit_hyst - hysteresis for critical temperature (read-only) | |
| 49 | temp#_min_alarm - temperature minimum alarm flag | |
| 50 | temp#_max_alarm - temperature maximum alarm flag | |
| 51 | temp#_crit_alarm - critical temperature alarm flag |