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Documentation/hwmon/lm70
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Kernel driver lm70 ================== |
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Supported chips: |
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* National Semiconductor LM70 Datasheet: http://www.national.com/pf/LM/LM70.html |
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* Texas Instruments TMP121/TMP123 Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html |
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* National Semiconductor LM71 Datasheet: http://www.ti.com/product/LM71 * National Semiconductor LM74 Datasheet: http://www.ti.com/product/LM74 |
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Author: Kaiwan N Billimoria <kaiwan@designergraphix.com> Description ----------- This driver implements support for the National Semiconductor LM70 temperature sensor. The LM70 temperature sensor chip supports a single temperature sensor. It communicates with a host processor (or microcontroller) via an SPI/Microwire Bus interface. Communication with the LM70 is simple: when the temperature is to be sensed, the driver accesses the LM70 using SPI communication: 16 SCLK cycles comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's complement digital temperature (sent via the SIO line), is available in the driver for interpretation. This driver makes use of the kernel's in-core SPI support. |
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As a real (in-tree) example of this "SPI protocol driver" interfacing with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c and its associated documentation. |
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The LM74 and TMP121/TMP123 are very similar; main difference is 13-bit temperature data (0.0625 degrees celsius resolution). The LM71 is also very similar; main difference is 14-bit temperature data (0.03125 degrees celsius resolution). |
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Thanks to --------- |
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Jean Delvare <jdelvare@suse.de> for mentoring the hwmon-side driver |
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development. |