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ina2xx

ina2xx 2.3 KB
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  1. Kernel driver ina2xx
    2. 

  2. ====================
    3. 

  3. 

  4. Supported chips:
    5. 

  5.   * Texas Instruments INA219
    6. 

  6.     Prefix: 'ina219'
    7. 

  7.     Addresses: I2C 0x40 - 0x4f
    8. 

  8.     Datasheet: Publicly available at the Texas Instruments website
    9. 

  9.                http://www.ti.com/
    10. 

  10. 

  11.   * Texas Instruments INA220
    12. 

  12.     Prefix: 'ina220'
    13. 

  13.     Addresses: I2C 0x40 - 0x4f
    14. 

  14.     Datasheet: Publicly available at the Texas Instruments website
    15. 

  15.                http://www.ti.com/
    16. 

  16. 

  17.   * Texas Instruments INA226
    18. 

  18.     Prefix: 'ina226'
    19. 

  19.     Addresses: I2C 0x40 - 0x4f
    20. 

  20.     Datasheet: Publicly available at the Texas Instruments website
    21. 

  21.                http://www.ti.com/
    22. 

  22. 

  23.   * Texas Instruments INA230
    24. 

  24.     Prefix: 'ina230'
    25. 

  25.     Addresses: I2C 0x40 - 0x4f
    26. 

  26.     Datasheet: Publicly available at the Texas Instruments website
    27. 

  27.                http://www.ti.com/
    28. 

  28. 

  29.   * Texas Instruments INA231
    30. 

  30.     Prefix: 'ina231'
    31. 

  31.     Addresses: I2C 0x40 - 0x4f
    32. 

  32.     Datasheet: Publicly available at the Texas Instruments website
    33. 

  33.                http://www.ti.com/
    34. 

  34. 

  35. Author: Lothar Felten <lothar.felten@gmail.com>
    36. 

  36. 

  37. Description
    38. 

  38. -----------
    39. 

  39. 

  40. The INA219 is a high-side current shunt and power monitor with an I2C
    41. 

  41. interface. The INA219 monitors both shunt drop and supply voltage, with
    42. 

  42. programmable conversion times and filtering.
    43. 

  43. 

  44. The INA220 is a high or low side current shunt and power monitor with an I2C
    45. 

  45. interface. The INA220 monitors both shunt drop and supply voltage.
    46. 

  46. 

  47. The INA226 is a current shunt and power monitor with an I2C interface.
    48. 

  48. The INA226 monitors both a shunt voltage drop and bus supply voltage.
    49. 

  49. 

  50. INA230 and INA231 are high or low side current shunt and power monitors
    51. 

  51. with an I2C interface. The chips monitor both a shunt voltage drop and
    52. 

  52. bus supply voltage.
    53. 

  53. 

  54. The shunt value in micro-ohms can be set via platform data or device tree at
    55. 

  55. compile-time or via the shunt_resistor attribute in sysfs at run-time. Please
    56. 

  56. refer to the Documentation/devicetree/bindings/i2c/ina2xx.txt for bindings
    57. 

  57. if the device tree is used.
    58. 

  58. 

  59. Additionally ina226 supports update_interval attribute as described in
    60. 

  60. Documentation/hwmon/sysfs-interface. Internally the interval is the sum of
    61. 

  61. bus and shunt voltage conversion times multiplied by the averaging rate. We
    62. 

  62. don't touch the conversion times and only modify the number of averages. The
    63. 

  63. lower limit of the update_interval is 2 ms, the upper limit is 2253 ms.
    64. 

  64. The actual programmed interval may vary from the desired value.
    65.