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-Kernel driver ntc_thermistor
-=================
-
-Supported thermistors:
-* Murata NTC Thermistors NCP15WB473, NCP18WB473, NCP21WB473, NCP03WB473, NCP15WL333
- Prefixes: 'ncp15wb473', 'ncp18wb473', 'ncp21wb473', 'ncp03wb473', 'ncp15wl333'
- Datasheet: Publicly available at Murata
-
-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 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.
-
-The four circuit models provided are:
-
- $: resister, [TH]: the thermistor
-
- 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
-
- [pullup_uV]
- |
- $ (pullup_ohm)
- |
- +----+-----------------------[read_uV]
- | |
- [TH] $ (pulldown_ohm)
- | |
- -------- (ground)
-
- 4. connect = NTC_CONNECTED_GROUND, pulldown_ohm = 0 (not-connected)
-
- [pullup_uV]
- |
- $ (pullup_ohm)
- |
- +----------------------------[read_uV]
- |
- [TH]
- |
- --- (ground)
-
-When one of the four circuit models is used, read_uV, pullup_uV, pullup_ohm,
-pulldown_ohm, and connect should be provided. When none of the four models
-are suitable or the user can get the resistance directly, the user should
-provide read_ohm and _not_ provide the others.
-
-Sysfs Interface
----------------
-name the mandatory global attribute, the thermistor name.
-
-temp1_type always 4 (thermistor)
- RO
-
-temp1_input measure the temperature and provide the measured value.
- (reading this file initiates the reading procedure.)
- RO
-
-Note that each NTC thermistor has only _one_ thermistor; thus, only temp1 exists.