| # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/iio/temperature/adi,ltc2983.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: Analog Devices LTC2983, LTC2986, LTM2985 Multi-sensor Temperature system |
| |
| maintainers: |
| - Nuno Sá <nuno.sa@analog.com> |
| |
| description: | |
| Analog Devices LTC2983, LTC2984, LTC2986, LTM2985 Multi-Sensor Digital |
| Temperature Measurement Systems |
| |
| https://www.analog.com/media/en/technical-documentation/data-sheets/2983fc.pdf |
| https://www.analog.com/media/en/technical-documentation/data-sheets/2984fb.pdf |
| https://www.analog.com/media/en/technical-documentation/data-sheets/29861fa.pdf |
| https://www.analog.com/media/en/technical-documentation/data-sheets/ltm2985.pdf |
| |
| $defs: |
| sensor-node: |
| type: object |
| description: Sensor node common constraints |
| |
| properties: |
| reg: |
| description: |
| Channel number. Connects the sensor to the channel with this number |
| of the device. |
| minimum: 1 |
| maximum: 20 |
| |
| adi,sensor-type: |
| description: Type of sensor connected to the device. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| |
| required: |
| - reg |
| - adi,sensor-type |
| |
| |
| properties: |
| compatible: |
| oneOf: |
| - enum: |
| - adi,ltc2983 |
| - adi,ltc2986 |
| - adi,ltm2985 |
| - items: |
| - const: adi,ltc2984 |
| - const: adi,ltc2983 |
| |
| reg: |
| maxItems: 1 |
| |
| interrupts: |
| maxItems: 1 |
| |
| adi,mux-delay-config-us: |
| description: | |
| Extra delay prior to each conversion, in addition to the internal 1ms |
| delay, for the multiplexer to switch input configurations and |
| excitation values. |
| |
| This property is supposed to be in microseconds, but to maintain |
| compatibility, this value will be multiplied by 100 before usage. |
| maximum: 255 |
| default: 0 |
| |
| adi,filter-notch-freq: |
| description: |
| Notch frequency of the digital filter. |
| 0 - 50/60Hz rejection |
| 1 - 60Hz rejection |
| 2 - 50Hz rejection |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| minimum: 0 |
| maximum: 2 |
| default: 0 |
| |
| '#address-cells': |
| const: 1 |
| |
| '#size-cells': |
| const: 0 |
| |
| patternProperties: |
| "^thermocouple@": |
| $ref: '#/$defs/sensor-node' |
| unevaluatedProperties: false |
| |
| description: Thermocouple sensor. |
| |
| properties: |
| adi,sensor-type: |
| description: | |
| 1 - Type J Thermocouple |
| 2 - Type K Thermocouple |
| 3 - Type E Thermocouple |
| 4 - Type N Thermocouple |
| 5 - Type R Thermocouple |
| 6 - Type S Thermocouple |
| 7 - Type T Thermocouple |
| 8 - Type B Thermocouple |
| 9 - Custom Thermocouple |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| minimum: 1 |
| maximum: 9 |
| |
| adi,single-ended: |
| description: Whether the sensor is single-ended. |
| type: boolean |
| |
| adi,sensor-oc-current-microamp: |
| description: Pulsed current value applied during open-circuit detect. |
| enum: [10, 100, 500, 1000] |
| default: 10 |
| |
| adi,cold-junction-handle: |
| description: |
| Sensor responsible for measuring the thermocouple cold junction |
| temperature. |
| $ref: /schemas/types.yaml#/definitions/phandle |
| |
| adi,custom-thermocouple: |
| description: |
| Used for digitizing custom thermocouples. |
| See Page 59 of the datasheet. |
| $ref: /schemas/types.yaml#/definitions/int64-matrix |
| minItems: 3 |
| maxItems: 64 |
| items: |
| items: |
| - description: Voltage point in nV, signed. |
| - description: Temperature point in uK. |
| |
| allOf: |
| - if: |
| properties: |
| adi,sensor-type: |
| const: 9 |
| then: |
| required: |
| - adi,custom-thermocouple |
| |
| "^diode@": |
| $ref: '#/$defs/sensor-node' |
| unevaluatedProperties: false |
| |
| description: Diode sensor. |
| |
| properties: |
| adi,sensor-type: |
| description: Sensor type for diodes. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| const: 28 |
| |
| adi,single-ended: |
| description: Whether the sensor is single-ended. |
| type: boolean |
| |
| adi,three-conversion-cycles: |
| description: |
| Whether to use three conversion cycles to remove parasitic |
| resistance between the device and the diode. |
| type: boolean |
| |
| adi,average-on: |
| description: |
| Whether to use a running average of the diode temperature |
| reading to reduce the noise when the diode is used as a cold |
| junction temperature element on an isothermal block where |
| temperatures change slowly. |
| type: boolean |
| |
| adi,excitation-current-microamp: |
| description: |
| Magnitude of the 1l excitation current applied to the diode. |
| 4l excitation current will be 4 times this value, and 8l |
| excitation current will be 8 times value. |
| enum: [10, 20, 40, 80] |
| default: 10 |
| |
| adi,ideal-factor-value: |
| description: |
| Diode ideality factor. |
| Set this property to 1000000 times the real value. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| default: 0 |
| |
| "^rtd@": |
| $ref: '#/$defs/sensor-node' |
| unevaluatedProperties: false |
| description: RTD sensor. |
| |
| properties: |
| reg: |
| minimum: 2 |
| maximum: 20 |
| |
| adi,sensor-type: |
| description: | |
| 10 - RTD PT-10 |
| 11 - RTD PT-50 |
| 12 - RTD PT-100 |
| 13 - RTD PT-200 |
| 14 - RTD PT-500 |
| 15 - RTD PT-1000 |
| 16 - RTD PT-1000 (0.00375) |
| 17 - RTD NI-120 |
| 18 - RTD Custom |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| minimum: 10 |
| maximum: 18 |
| |
| adi,rsense-handle: |
| description: Associated sense resistor sensor. |
| $ref: /schemas/types.yaml#/definitions/phandle |
| |
| adi,number-of-wires: |
| description: |
| Number of wires used by the RTD. |
| 5 means 4 wires with Kelvin sense resistor. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| enum: [2, 3, 4, 5] |
| default: 2 |
| |
| adi,rsense-share: |
| description: |
| Whether to enable sense resistor sharing, where one sense |
| resistor is used by multiple sensors. |
| type: boolean |
| |
| adi,excitation-current-microamp: |
| description: Excitation current applied to the RTD. |
| enum: [5, 10, 25, 50, 100, 250, 500, 1000] |
| default: 5 |
| |
| adi,rtd-curve: |
| description: | |
| RTD curve and the corresponding Callendar-VanDusen constants. |
| 0 - European |
| 1 - American |
| 2 - Japanese |
| 3 - ITS-90 |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| minimum: 0 |
| maximum: 3 |
| default: 0 |
| |
| adi,custom-rtd: |
| description: |
| Used for digitizing custom RTDs. |
| See Page 62 of the datasheet. |
| $ref: /schemas/types.yaml#/definitions/uint64-matrix |
| minItems: 3 |
| maxItems: 64 |
| items: |
| items: |
| - description: Resistance point in uOhms. |
| - description: Temperature point in uK. |
| |
| required: |
| - adi,rsense-handle |
| |
| allOf: |
| - if: |
| properties: |
| adi,number-of-wires: |
| const: 4 |
| then: |
| properties: |
| adi,current-rotate: |
| description: |
| Whether to enable excitation current rotation to automatically |
| remove parasitic thermocouple effects. |
| type: boolean |
| |
| dependencies: |
| adi,current-rotate: [ "adi,rsense-share" ] |
| |
| - if: |
| properties: |
| adi,sensor-type: |
| const: 18 |
| then: |
| required: |
| - adi,custom-rtd |
| |
| "^thermistor@": |
| $ref: '#/$defs/sensor-node' |
| unevaluatedProperties: false |
| description: Thermistor sensor. |
| |
| properties: |
| adi,sensor-type: |
| description: |
| 19 - Thermistor 44004/44033 2.252kohm at 25°C |
| 20 - Thermistor 44005/44030 3kohm at 25°C |
| 21 - Thermistor 44007/44034 5kohm at 25°C |
| 22 - Thermistor 44006/44031 10kohm at 25°C |
| 23 - Thermistor 44008/44032 30kohm at 25°C |
| 24 - Thermistor YSI 400 2.252kohm at 25°C |
| 25 - Thermistor Spectrum 1003k 1kohm |
| 26 - Thermistor Custom Steinhart-Hart |
| 27 - Custom Thermistor |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| minimum: 19 |
| maximum: 27 |
| |
| adi,rsense-handle: |
| description: Associated sense resistor sensor. |
| $ref: /schemas/types.yaml#/definitions/phandle |
| |
| adi,single-ended: |
| description: Whether the sensor is single-ended. |
| type: boolean |
| |
| adi,rsense-share: |
| description: |
| Whether to enable sense resistor sharing, where one sense |
| resistor is used by multiple sensors. |
| type: boolean |
| |
| adi,current-rotate: |
| description: |
| Whether to enable excitation current rotation to automatically |
| remove parasitic thermocouple effects. |
| type: boolean |
| |
| adi,excitation-current-nanoamp: |
| description: |
| Excitation current applied to the thermistor. |
| 0 sets the sensor in auto-range mode. |
| enum: [0, 250, 500, 1000, 5000, 10000, 25000, 50000, 100000, 250000, |
| 500000, 1000000] |
| default: 0 |
| |
| adi,custom-thermistor: |
| description: |
| Used for digitizing custom thermistors. |
| See Page 65 of the datasheet. |
| $ref: /schemas/types.yaml#/definitions/uint64-matrix |
| minItems: 3 |
| maxItems: 64 |
| items: |
| items: |
| - description: Resistance point in uOhms. |
| - description: Temperature point in uK. |
| |
| adi,custom-steinhart: |
| description: |
| Steinhart-Hart coefficients in raw format, used for digitizing |
| custom thermistors. |
| See Page 68 of the datasheet. |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| minItems: 6 |
| maxItems: 6 |
| |
| required: |
| - adi,rsense-handle |
| |
| dependencies: |
| adi,current-rotate: [ "adi,rsense-share" ] |
| |
| allOf: |
| - if: |
| properties: |
| adi,sensor-type: |
| const: 26 |
| then: |
| properties: |
| adi,excitation-current-nanoamp: |
| enum: [250, 500, 1000, 5000, 10000, 25000, 50000, 100000, |
| 250000, 500000, 1000000] |
| default: 1000 |
| required: |
| - adi,custom-steinhart |
| - if: |
| properties: |
| adi,sensor-type: |
| const: 27 |
| then: |
| properties: |
| adi,excitation-current-nanoamp: |
| enum: [250, 500, 1000, 5000, 10000, 25000, 50000, 100000, |
| 250000, 500000, 1000000] |
| default: 1000 |
| required: |
| - adi,custom-thermistor |
| |
| "^adc@": |
| $ref: '#/$defs/sensor-node' |
| unevaluatedProperties: false |
| description: Direct ADC sensor. |
| |
| properties: |
| adi,sensor-type: |
| description: Sensor type for direct ADC sensors. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| const: 30 |
| |
| adi,single-ended: |
| description: Whether the sensor is single-ended. |
| type: boolean |
| |
| "^temp@": |
| $ref: '#/$defs/sensor-node' |
| unevaluatedProperties: false |
| description: Active analog temperature sensor. |
| |
| properties: |
| adi,sensor-type: |
| description: Sensor type for active analog temperature sensors. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| const: 31 |
| |
| adi,single-ended: |
| description: Whether the sensor is single-ended. |
| type: boolean |
| |
| adi,custom-temp: |
| description: |
| Used for digitizing active analog temperature sensors. |
| See Page 67 of the LTM2985 datasheet. |
| $ref: /schemas/types.yaml#/definitions/uint64-matrix |
| minItems: 3 |
| maxItems: 64 |
| items: |
| items: |
| - description: Voltage point in nV, signed. |
| - description: Temperature point in uK. |
| |
| required: |
| - adi,custom-temp |
| |
| "^rsense@": |
| $ref: '#/$defs/sensor-node' |
| unevaluatedProperties: false |
| description: Sense resistor sensor. |
| |
| properties: |
| reg: |
| minimum: 2 |
| maximum: 20 |
| |
| adi,sensor-type: |
| description: Sensor type sense resistor sensors. |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| const: 29 |
| |
| adi,rsense-val-milli-ohms: |
| description: Value of the sense resistor. |
| |
| required: |
| - adi,rsense-val-milli-ohms |
| |
| required: |
| - compatible |
| - reg |
| - interrupts |
| |
| additionalProperties: false |
| |
| allOf: |
| - if: |
| properties: |
| compatible: |
| contains: |
| enum: |
| - adi,ltc2983 |
| - adi,ltc2984 |
| then: |
| patternProperties: |
| "^temp@": false |
| |
| examples: |
| - | |
| #include <dt-bindings/interrupt-controller/irq.h> |
| spi { |
| #address-cells = <1>; |
| #size-cells = <0>; |
| |
| temperature-sensor@0 { |
| compatible = "adi,ltc2983"; |
| reg = <0>; |
| |
| #address-cells = <1>; |
| #size-cells = <0>; |
| |
| interrupts = <20 IRQ_TYPE_EDGE_RISING>; |
| interrupt-parent = <&gpio>; |
| |
| thermocouple@18 { |
| reg = <18>; |
| adi,sensor-type = <8>; //Type B |
| adi,sensor-oc-current-microamp = <10>; |
| adi,cold-junction-handle = <&diode5>; |
| }; |
| |
| diode5: diode@5 { |
| reg = <5>; |
| adi,sensor-type = <28>; |
| }; |
| |
| rsense2: rsense@2 { |
| reg = <2>; |
| adi,sensor-type = <29>; |
| adi,rsense-val-milli-ohms = <1200000>; //1.2Kohms |
| }; |
| |
| rtd@14 { |
| reg = <14>; |
| adi,sensor-type = <15>; //PT1000 |
| /*2-wire, internal gnd, no current rotation*/ |
| adi,number-of-wires = <2>; |
| adi,rsense-share; |
| adi,excitation-current-microamp = <500>; |
| adi,rsense-handle = <&rsense2>; |
| }; |
| |
| adc@10 { |
| reg = <10>; |
| adi,sensor-type = <30>; |
| adi,single-ended; |
| }; |
| |
| thermistor@12 { |
| reg = <12>; |
| adi,sensor-type = <26>; //Steinhart |
| adi,rsense-handle = <&rsense2>; |
| adi,custom-steinhart = <0x00f371ec 0x12345678 |
| 0x2c0f8733 0x10018c66 0xa0feaccd |
| 0x90021d99>; //6 entries |
| }; |
| |
| thermocouple@20 { |
| reg = <20>; |
| adi,sensor-type = <9>; //custom thermocouple |
| adi,single-ended; |
| adi,custom-thermocouple = |
| /bits/ 64 <(-50220000) 0>, |
| /bits/ 64 <(-30200000) 99100000>, |
| /bits/ 64 <(-5300000) 135400000>, |
| /bits/ 64 <0 273150000>, |
| /bits/ 64 <40200000 361200000>, |
| /bits/ 64 <55300000 522100000>, |
| /bits/ 64 <88300000 720300000>, |
| /bits/ 64 <132200000 811200000>, |
| /bits/ 64 <188700000 922500000>, |
| /bits/ 64 <460400000 1000000000>; //10 pairs |
| }; |
| }; |
| }; |
| ... |
