Documentation/hwmon/ntc_thermistor.rst

Source file repositories/reference/linux-study-clean/Documentation/hwmon/ntc_thermistor.rst

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Linux kernel
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Documentation/hwmon/ntc_thermistor.rst
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.rst
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Support Tooling And Documentation
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Documentation
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Support Tooling And Documentation: documentation
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Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

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Kernel driver ntc_thermistor
============================

Supported thermistors from Murata:

* Murata NTC Thermistors NCP15WB473, NCP18WB473, NCP21WB473, NCP03WB473,
  NCP15WL333, NCP03WF104, NCP15XH103

  Prefixes: 'ncp15wb473', 'ncp18wb473', 'ncp21wb473', 'ncp03wb473',
  'ncp15wl333', 'ncp03wf104', 'ncp15xh103'

  Datasheet: Publicly available at Murata

Supported thermistors from EPCOS:

* EPCOS NTC Thermistors B57330V2103

  Prefixes: b57330v2103

  Datasheet: Publicly available at EPCOS

Other NTC thermistors can be supported simply by adding compensation
tables; e.g., NCP15WL333 support is added by the table ncpXXwl333.

Authors:

	MyungJoo Ham <myungjoo.ham@samsung.com>

Description
-----------

The NTC (Negative Temperature Coefficient) thermistor is a simple thermistor
that requires users to provide the resistance and lookup the corresponding
compensation table to get the temperature input.

The NTC driver provides lookup tables with a linear approximation function
and four circuit models with an option not to use any of the four models.

Using the following convention::

   $	resistor
   [TH]	the thermistor

The four circuit models provided are:

1. connect = NTC_CONNECTED_POSITIVE, pullup_ohm > 0::

     [pullup_uV]
	 |    |
	[TH]  $ (pullup_ohm)
	 |    |
	 +----+-----------------------[read_uV]
	 |
	 $ (pulldown_ohm)
	 |
	-+- (ground)

2. connect = NTC_CONNECTED_POSITIVE, pullup_ohm = 0 (not-connected)::

     [pullup_uV]
	 |
	[TH]
	 |
	 +----------------------------[read_uV]
	 |
	 $ (pulldown_ohm)
	 |
	-+- (ground)

3. connect = NTC_CONNECTED_GROUND, pulldown_ohm > 0::

Annotation

Implementation Notes