linux/Documentation/hwmon/lm70
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   1Kernel driver lm70
   2==================
   3
   4Supported chips:
   5  * National Semiconductor LM70
   6    Datasheet: http://www.national.com/pf/LM/LM70.html
   7  * Texas Instruments TMP121/TMP123
   8    Information: http://focus.ti.com/docs/prod/folders/print/tmp121.html
   9  * National Semiconductor LM71
  10    Datasheet: http://www.ti.com/product/LM71
  11  * National Semiconductor LM74
  12    Datasheet: http://www.ti.com/product/LM74
  13
  14Author:
  15        Kaiwan N Billimoria <kaiwan@designergraphix.com>
  16
  17Description
  18-----------
  19
  20This driver implements support for the National Semiconductor LM70
  21temperature sensor.
  22
  23The LM70 temperature sensor chip supports a single temperature sensor.
  24It communicates with a host processor (or microcontroller) via an
  25SPI/Microwire Bus interface.
  26
  27Communication with the LM70 is simple: when the temperature is to be sensed,
  28the driver accesses the LM70 using SPI communication: 16 SCLK cycles
  29comprise the MOSI/MISO loop. At the end of the transfer, the 11-bit 2's
  30complement digital temperature (sent via the SIO line), is available in the
  31driver for interpretation. This driver makes use of the kernel's in-core
  32SPI support.
  33
  34As a real (in-tree) example of this "SPI protocol driver" interfacing
  35with a "SPI master controller driver", see drivers/spi/spi_lm70llp.c
  36and its associated documentation.
  37
  38The LM74 and TMP121/TMP123 are very similar; main difference is 13-bit
  39temperature data (0.0625 degrees celsius resolution).
  40
  41The LM71 is also very similar; main difference is 14-bit temperature
  42data (0.03125 degrees celsius resolution).
  43
  44Thanks to
  45---------
  46Jean Delvare <khali@linux-fr.org> for mentoring the hwmon-side driver
  47development.
  48
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