Lines Matching +full:on +full:- +full:resistance
1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 ---
3 $id: http://devicetree.org/schemas/hwmon/ntc-thermistor.yaml#
4 $schema: http://devicetree.org/meta-schemas/core.yaml#
9 - Naveen Krishna Chatradhi <ch.naveen@samsung.com>
10 - Linus Walleij <linus.walleij@linaro.org>
14 vary in resistance in an often non-linear way in relation to temperature.
15 The negative temperature coefficient means that the resistance decreases
16 as the temperature rises. Since the relationship between resistance and
17 temperature is non-linear, software drivers most often need to use a look
18 up table and interpolation to get from resistance to temperature.
21 pull-up resistor or/and a pull-down resistor and a fixed voltage like this:
23 + e.g. 5V = pull-up voltage (puv)
25 +-+
27 | | Pull-up resistor
29 +-+
30 |-------------------------o
31 +-+ | ^
37 +-+ |
38 |-------------------------o
39 +-+ ^
41 | | Pull-down resistor | Measured voltage (mv)
43 +-+ |
50 the cases when either pull-up or pull-down resistance is zero.
52 If the pull-up resistance is 0 one end of the thermistor is connected to the
53 positive voltage and we get the thermistor on top of a pull-down resistor
54 and we take the measure between the thermistor and the pull-down resistor.
56 Conversely if the pull-down resistance is zero, one end of the thermistor is
57 connected to ground and we get the thermistor under the pull-up resistor
58 and we take the measure between the pull-up resistor and the thermistor.
60 We can use both pull-up and pull-down resistors at the same time, and then
70 - const: epcos,b57330v2103
71 - const: epcos,b57891s0103
72 - const: murata,ncp15wb473
73 - const: murata,ncp18wb473
74 - const: murata,ncp21wb473
75 - const: murata,ncp03wb473
76 - const: murata,ncp15wl333
77 - const: murata,ncp03wf104
78 - const: murata,ncp15xh103
79 - const: samsung,1404-001221
81 - const: ntc,ncp15wb473
83 - const: ntc,ncp18wb473
85 - const: ntc,ncp21wb473
87 - const: ntc,ncp03wb473
89 - const: ntc,ncp15wl333
92 "#thermal-sensor-cells":
96 pullup-uv:
98 description: Pull-up voltage in micro volts. Must always be specified.
100 pullup-ohm:
102 description: Pull-up resistance in ohms. Must always be specified, even
105 pulldown-ohm:
107 description: Pull-down resistance in ohms. Must always be specified, even
110 connected-positive:
113 a pull-up and/or a pull-down resistor. See the description above for
115 to be connected-ground, which usually means a pull-down resistance of
119 io-channels:
125 - compatible
126 - pullup-uv
127 - pullup-ohm
128 - pulldown-ohm
129 - io-channels
134 - |
137 io-channels = <&gpadc 0x06>;
138 pullup-uv = <1800000>;
139 pullup-ohm = <220000>;
140 pulldown-ohm = <0>;
141 #thermal-sensor-cells = <0>;