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62 lines
1.8 KiB
62 lines
1.8 KiB
Kernel driver lm70 |
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Supported chips: |
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* National Semiconductor LM70 |
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Datasheet: http://www.national.com/pf/LM/LM70.html |
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* Texas Instruments TMP121/TMP123 |
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Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html |
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* Texas Instruments TMP122/TMP124 |
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Information: https://www.ti.com/product/tmp122 |
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* National Semiconductor LM71 |
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Datasheet: https://www.ti.com/product/LM71 |
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* National Semiconductor LM74 |
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Datasheet: https://www.ti.com/product/LM74 |
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Author: |
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Kaiwan N Billimoria <[email protected]> |
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Description |
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----------- |
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This driver implements support for the National Semiconductor LM70 |
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temperature sensor. |
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The LM70 temperature sensor chip supports a single temperature sensor. |
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It communicates with a host processor (or microcontroller) via an |
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SPI/Microwire Bus interface. |
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Communication with the LM70 is simple: when the temperature is to be sensed, |
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the driver accesses the LM70 using SPI communication: 16 SCLK cycles |
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comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's |
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complement digital temperature (sent via the SIO line), is available in the |
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driver for interpretation. This driver makes use of the kernel's in-core |
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SPI support. |
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As a real (in-tree) example of this "SPI protocol driver" interfacing |
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with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c |
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and its associated documentation. |
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The LM74 and TMP121/TMP122/TMP123/TMP124 are very similar; main difference is |
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13-bit temperature data (0.0625 degrees celsius resolution). |
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The TMP122/TMP124 also feature configurable temperature thresholds. |
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The LM71 is also very similar; main difference is 14-bit temperature |
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data (0.03125 degrees celsius resolution). |
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Thanks to |
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--------- |
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Jean Delvare <[email protected]> for mentoring the hwmon-side driver |
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development.
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