2009-07-28 22:52:22 +08:00
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Kernel driver wm831x-hwmon
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==========================
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Supported chips:
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* Wolfson Microelectronics WM831x PMICs
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Prefix: 'wm831x'
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Datasheet:
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http://www.wolfsonmicro.com/products/WM8310
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http://www.wolfsonmicro.com/products/WM8311
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http://www.wolfsonmicro.com/products/WM8312
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Authors: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Description
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-----------
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The WM831x series of PMICs include an AUXADC which can be used to
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monitor a range of system operating parameters, including the voltages
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of the major supplies within the system. Currently the driver provides
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reporting of all the input values but does not provide any alarms.
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Voltage Monitoring
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------------------
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2012-02-18 00:46:21 +08:00
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Voltages are sampled by a 12 bit ADC. Voltages in millivolts are 1.465
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2009-07-28 22:52:22 +08:00
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times the ADC value.
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Temperature Monitoring
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----------------------
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Temperatures are sampled by a 12 bit ADC. Chip and battery temperatures
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are available. The chip temperature is calculated as:
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Degrees celsius = (512.18 - data) / 1.0983
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while the battery temperature calculation will depend on the NTC
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thermistor component.
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