42 lines
1.5 KiB
Plaintext
42 lines
1.5 KiB
Plaintext
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Capella Microsystems CM3605
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Ambient Light and Short Distance Proximity Sensor
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The CM3605 is an entirely analog part which however require quite a bit of
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software logic to interface a host operating system.
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This ALS and proximity sensor was one of the very first deployed in mobile
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handsets, notably it is used in the very first Nexus One Android phone from
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2010.
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Required properties:
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- compatible: must be: "capella,cm3605"
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- aset-gpios: GPIO line controlling the ASET line (drive low
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to activate the ALS, should be flagged GPIO_ACTIVE_LOW)
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- interrupts: the IRQ line (such as a GPIO) that is connected to
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the POUT (proximity sensor out) line. The edge detection must
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be set to IRQ_TYPE_EDGE_BOTH so as to detect movements toward
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and away from the proximity sensor.
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- io-channels: the ADC channel used for converting the voltage from
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AOUT to a digital representation.
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- io-channel-names: must be "aout"
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Optional properties:
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- vdd-supply: regulator supplying VDD power to the component.
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- capella,aset-resistance-ohms: the sensitivity calibration resistance,
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in Ohms. Valid values are: 50000, 100000, 300000 and 600000,
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as these are the resistance values that we are supplied with
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calibration curves for. If not supplied, 100 kOhm will be assumed
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but it is strongly recommended to supply this.
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Example:
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cm3605 {
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compatible = "capella,cm3605";
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vdd-supply = <&foo_reg>;
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aset-gpios = <&foo_gpio 1 GPIO_ACTIVE_LOW>;
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capella,aset-resistance-ohms = <100000>;
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interrupts = <1 IRQ_TYPE_EDGE_BOTH>;
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io-channels = <&adc 0x01>;
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io-channel-names = "aout";
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};
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