lm75.rst 4.2 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164
  1. Kernel driver lm75
  2. ==================
  3. Supported chips:
  4. * National Semiconductor LM75
  5. Prefix: 'lm75'
  6. Addresses scanned: I2C 0x48 - 0x4f
  7. Datasheet: Publicly available at the National Semiconductor website
  8. http://www.national.com/
  9. * National Semiconductor LM75A
  10. Prefix: 'lm75a'
  11. Addresses scanned: I2C 0x48 - 0x4f
  12. Datasheet: Publicly available at the National Semiconductor website
  13. http://www.national.com/
  14. * Dallas Semiconductor (now Maxim) DS75, DS1775, DS7505
  15. Prefixes: 'ds75', 'ds1775', 'ds7505'
  16. Addresses scanned: none
  17. Datasheet: Publicly available at the Maxim website
  18. https://www.maximintegrated.com/
  19. * Maxim MAX6625, MAX6626, MAX31725, MAX31726
  20. Prefixes: 'max6625', 'max6626', 'max31725', 'max31726'
  21. Addresses scanned: none
  22. Datasheet: Publicly available at the Maxim website
  23. http://www.maxim-ic.com/
  24. * Microchip (TelCom) TCN75
  25. Prefix: 'tcn75'
  26. Addresses scanned: none
  27. Datasheet: Publicly available at the Microchip website
  28. http://www.microchip.com/
  29. * Microchip MCP9800, MCP9801, MCP9802, MCP9803
  30. Prefix: 'mcp980x'
  31. Addresses scanned: none
  32. Datasheet: Publicly available at the Microchip website
  33. http://www.microchip.com/
  34. * Analog Devices ADT75
  35. Prefix: 'adt75'
  36. Addresses scanned: none
  37. Datasheet: Publicly available at the Analog Devices website
  38. https://www.analog.com/adt75
  39. * ST Microelectronics STDS75
  40. Prefix: 'stds75'
  41. Addresses scanned: none
  42. Datasheet: Publicly available at the ST website
  43. http://www.st.com/internet/analog/product/121769.jsp
  44. * ST Microelectronics STLM75
  45. Prefix: 'stlm75'
  46. Addresses scanned: none
  47. Datasheet: Publicly available at the ST website
  48. https://www.st.com/resource/en/datasheet/stlm75.pdf
  49. * Texas Instruments TMP100, TMP101, TMP105, TMP112, TMP75, TMP75B, TMP75C, TMP175, TMP275
  50. Prefixes: 'tmp100', 'tmp101', 'tmp105', 'tmp112', 'tmp175', 'tmp75', 'tmp75b', 'tmp75c', 'tmp275'
  51. Addresses scanned: none
  52. Datasheet: Publicly available at the Texas Instruments website
  53. https://www.ti.com/product/tmp100
  54. https://www.ti.com/product/tmp101
  55. https://www.ti.com/product/tmp105
  56. https://www.ti.com/product/tmp112
  57. https://www.ti.com/product/tmp75
  58. https://www.ti.com/product/tmp75b
  59. https://www.ti.com/product/tmp75c
  60. https://www.ti.com/product/tmp175
  61. https://www.ti.com/product/tmp275
  62. * NXP LM75B, PCT2075
  63. Prefix: 'lm75b', 'pct2075'
  64. Addresses scanned: none
  65. Datasheet: Publicly available at the NXP website
  66. https://www.nxp.com/documents/data_sheet/LM75B.pdf
  67. https://www.nxp.com/docs/en/data-sheet/PCT2075.pdf
  68. Author: Frodo Looijaard <frodol@dds.nl>
  69. Description
  70. -----------
  71. The LM75 implements one temperature sensor. Limits can be set through the
  72. Overtemperature Shutdown register and Hysteresis register. Each value can be
  73. set and read to half-degree accuracy.
  74. An alarm is issued (usually to a connected LM78) when the temperature
  75. gets higher then the Overtemperature Shutdown value; it stays on until
  76. the temperature falls below the Hysteresis value.
  77. All temperatures are in degrees Celsius, and are guaranteed within a
  78. range of -55 to +125 degrees.
  79. The driver caches the values for a period varying between 1 second for the
  80. slowest chips and 125 ms for the fastest chips; reading it more often
  81. will do no harm, but will return 'old' values.
  82. The original LM75 was typically used in combination with LM78-like chips
  83. on PC motherboards, to measure the temperature of the processor(s). Clones
  84. are now used in various embedded designs.
  85. The LM75 is essentially an industry standard; there may be other
  86. LM75 clones not listed here, with or without various enhancements,
  87. that are supported. The clones are not detected by the driver, unless
  88. they reproduce the exact register tricks of the original LM75, and must
  89. therefore be instantiated explicitly. Higher resolution up to 16-bit
  90. is supported by this driver, other specific enhancements are not.
  91. The LM77 is not supported, contrary to what we pretended for a long time.
  92. Both chips are simply not compatible, value encoding differs.