| Hartmut Knaack | 983b97b | 2012-08-12 18:15:49 +0200 | [diff] [blame] | 1 | Kernel driver adt7410 |
| 2 | ===================== |
| 3 | |
| 4 | Supported chips: |
| 5 | * Analog Devices ADT7410 |
| 6 | Prefix: 'adt7410' |
| Jean Delvare | ab302bb | 2013-02-28 13:05:13 +0100 | [diff] [blame] | 7 | Addresses scanned: None |
| Hartmut Knaack | 983b97b | 2012-08-12 18:15:49 +0200 | [diff] [blame] | 8 | Datasheet: Publicly available at the Analog Devices website |
| 9 | http://www.analog.com/static/imported-files/data_sheets/ADT7410.pdf |
| Jean Delvare | ab302bb | 2013-02-28 13:05:13 +0100 | [diff] [blame] | 10 | * Analog Devices ADT7420 |
| 11 | Prefix: 'adt7420' |
| 12 | Addresses scanned: None |
| 13 | Datasheet: Publicly available at the Analog Devices website |
| 14 | http://www.analog.com/static/imported-files/data_sheets/ADT7420.pdf |
| Lars-Peter Clausen | 51c2a48 | 2013-03-12 11:38:46 +0100 | [diff] [blame] | 15 | * Analog Devices ADT7310 |
| 16 | Prefix: 'adt7310' |
| 17 | Addresses scanned: None |
| 18 | Datasheet: Publicly available at the Analog Devices website |
| 19 | http://www.analog.com/static/imported-files/data_sheets/ADT7310.pdf |
| 20 | * Analog Devices ADT7320 |
| 21 | Prefix: 'adt7320' |
| 22 | Addresses scanned: None |
| 23 | Datasheet: Publicly available at the Analog Devices website |
| 24 | http://www.analog.com/static/imported-files/data_sheets/ADT7320.pdf |
| Hartmut Knaack | 983b97b | 2012-08-12 18:15:49 +0200 | [diff] [blame] | 25 | |
| 26 | Author: Hartmut Knaack <knaack.h@gmx.de> |
| 27 | |
| 28 | Description |
| 29 | ----------- |
| 30 | |
| Lars-Peter Clausen | 51c2a48 | 2013-03-12 11:38:46 +0100 | [diff] [blame] | 31 | The ADT7310/ADT7410 is a temperature sensor with rated temperature range of |
| 32 | -55°C to +150°C. It has a high accuracy of +/-0.5°C and can be operated at a |
| 33 | resolution of 13 bits (0.0625°C) or 16 bits (0.0078°C). The sensor provides an |
| 34 | INT pin to indicate that a minimum or maximum temperature set point has been |
| 35 | exceeded, as well as a critical temperature (CT) pin to indicate that the |
| 36 | critical temperature set point has been exceeded. Both pins can be set up with a |
| 37 | common hysteresis of 0°C - 15°C and a fault queue, ranging from 1 to 4 events. |
| 38 | Both pins can individually set to be active-low or active-high, while the whole |
| 39 | device can either run in comparator mode or interrupt mode. The ADT7410 supports |
| 40 | continuous temperature sampling, as well as sampling one temperature value per |
| 41 | second or even just get one sample on demand for power saving. Besides, it can |
| 42 | completely power down its ADC, if power management is required. |
| Hartmut Knaack | 983b97b | 2012-08-12 18:15:49 +0200 | [diff] [blame] | 43 | |
| Lars-Peter Clausen | 51c2a48 | 2013-03-12 11:38:46 +0100 | [diff] [blame] | 44 | The ADT7320/ADT7420 is register compatible, the only differences being the |
| 45 | package, a slightly narrower operating temperature range (-40°C to +150°C), and |
| 46 | a better accuracy (0.25°C instead of 0.50°C.) |
| 47 | |
| 48 | The difference between the ADT7310/ADT7320 and ADT7410/ADT7420 is the control |
| 49 | interface, the ADT7310 and ADT7320 use SPI while the ADT7410 and ADT7420 use |
| 50 | I2C. |
| Jean Delvare | ab302bb | 2013-02-28 13:05:13 +0100 | [diff] [blame] | 51 | |
| Hartmut Knaack | 983b97b | 2012-08-12 18:15:49 +0200 | [diff] [blame] | 52 | Configuration Notes |
| 53 | ------------------- |
| 54 | |
| 55 | Since the device uses one hysteresis value, which is an offset to minimum, |
| 56 | maximum and critical temperature, it can only be set for temp#_max_hyst. |
| 57 | However, temp#_min_hyst and temp#_crit_hyst show their corresponding |
| 58 | hysteresis. |
| 59 | The device is set to 16 bit resolution and comparator mode. |
| 60 | |
| 61 | sysfs-Interface |
| 62 | --------------- |
| 63 | |
| 64 | temp#_input - temperature input |
| 65 | temp#_min - temperature minimum setpoint |
| 66 | temp#_max - temperature maximum setpoint |
| 67 | temp#_crit - critical temperature setpoint |
| 68 | temp#_min_hyst - hysteresis for temperature minimum (read-only) |
| 69 | temp#_max_hyst - hysteresis for temperature maximum (read/write) |
| 70 | temp#_crit_hyst - hysteresis for critical temperature (read-only) |
| 71 | temp#_min_alarm - temperature minimum alarm flag |
| 72 | temp#_max_alarm - temperature maximum alarm flag |
| 73 | temp#_crit_alarm - critical temperature alarm flag |