74 lines
3.1 KiB
Text
74 lines
3.1 KiB
Text
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Kernel driver adt7410
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=====================
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Supported chips:
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* Analog Devices ADT7410
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Prefix: 'adt7410'
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Addresses scanned: None
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Datasheet: Publicly available at the Analog Devices website
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http://www.analog.com/static/imported-files/data_sheets/ADT7410.pdf
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* Analog Devices ADT7420
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Prefix: 'adt7420'
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Addresses scanned: None
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Datasheet: Publicly available at the Analog Devices website
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http://www.analog.com/static/imported-files/data_sheets/ADT7420.pdf
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* Analog Devices ADT7310
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Prefix: 'adt7310'
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Addresses scanned: None
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Datasheet: Publicly available at the Analog Devices website
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http://www.analog.com/static/imported-files/data_sheets/ADT7310.pdf
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* Analog Devices ADT7320
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Prefix: 'adt7320'
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Addresses scanned: None
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Datasheet: Publicly available at the Analog Devices website
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http://www.analog.com/static/imported-files/data_sheets/ADT7320.pdf
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Author: Hartmut Knaack <knaack.h@gmx.de>
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Description
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-----------
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The ADT7310/ADT7410 is a temperature sensor with rated temperature range of
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-55°C to +150°C. It has a high accuracy of +/-0.5°C and can be operated at a
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resolution of 13 bits (0.0625°C) or 16 bits (0.0078°C). The sensor provides an
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INT pin to indicate that a minimum or maximum temperature set point has been
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exceeded, as well as a critical temperature (CT) pin to indicate that the
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critical temperature set point has been exceeded. Both pins can be set up with a
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common hysteresis of 0°C - 15°C and a fault queue, ranging from 1 to 4 events.
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Both pins can individually set to be active-low or active-high, while the whole
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device can either run in comparator mode or interrupt mode. The ADT7410 supports
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continuous temperature sampling, as well as sampling one temperature value per
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second or even just get one sample on demand for power saving. Besides, it can
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completely power down its ADC, if power management is required.
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The ADT7320/ADT7420 is register compatible, the only differences being the
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package, a slightly narrower operating temperature range (-40°C to +150°C), and
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a better accuracy (0.25°C instead of 0.50°C.)
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The difference between the ADT7310/ADT7320 and ADT7410/ADT7420 is the control
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interface, the ADT7310 and ADT7320 use SPI while the ADT7410 and ADT7420 use
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I2C.
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Configuration Notes
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-------------------
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Since the device uses one hysteresis value, which is an offset to minimum,
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maximum and critical temperature, it can only be set for temp#_max_hyst.
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However, temp#_min_hyst and temp#_crit_hyst show their corresponding
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hysteresis.
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The device is set to 16 bit resolution and comparator mode.
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sysfs-Interface
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---------------
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temp#_input - temperature input
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temp#_min - temperature minimum setpoint
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temp#_max - temperature maximum setpoint
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temp#_crit - critical temperature setpoint
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temp#_min_hyst - hysteresis for temperature minimum (read-only)
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temp#_max_hyst - hysteresis for temperature maximum (read/write)
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temp#_crit_hyst - hysteresis for critical temperature (read-only)
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temp#_min_alarm - temperature minimum alarm flag
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temp#_max_alarm - temperature maximum alarm flag
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temp#_crit_alarm - critical temperature alarm flag
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