46 lines
2 KiB
Plaintext
46 lines
2 KiB
Plaintext
|
* UPISEMI us5182d I2C ALS and Proximity sensor
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
- compatible: must be "upisemi,usd5182"
|
||
|
|
- reg: the I2C address of the device
|
||
|
|
|
||
|
|
Optional properties:
|
||
|
|
- upisemi,glass-coef: glass attenuation factor - compensation factor of
|
||
|
|
resolution 1000 for material transmittance.
|
||
|
|
|
||
|
|
- upisemi,dark-ths: array of 8 elements containing 16-bit thresholds (adc
|
||
|
|
counts) corresponding to every scale.
|
||
|
|
|
||
|
|
- upisemi,upper-dark-gain: 8-bit dark gain compensation factor(4 int and 4
|
||
|
|
fractional bits - Q4.4) applied when light > threshold
|
||
|
|
|
||
|
|
- upisemi,lower-dark-gain: 8-bit dark gain compensation factor(4 int and 4
|
||
|
|
fractional bits - Q4.4) applied when light < threshold
|
||
|
|
|
||
|
|
- upisemi,continuous: This chip has two power modes: one-shot (chip takes one
|
||
|
|
measurement and then shuts itself down) and continuous (
|
||
|
|
chip takes continuous measurements). The one-shot mode is
|
||
|
|
more power-friendly but the continuous mode may be more
|
||
|
|
reliable. If this property is specified the continuous
|
||
|
|
mode will be used instead of the default one-shot one for
|
||
|
|
raw reads.
|
||
|
|
|
||
|
|
If the optional properties are not specified these factors will default to the
|
||
|
|
values in the below example.
|
||
|
|
The glass-coef defaults to no compensation for the covering material.
|
||
|
|
The threshold array defaults to experimental values that work with US5182D
|
||
|
|
sensor on evaluation board - roughly between 12-32 lux.
|
||
|
|
There will be no dark-gain compensation by default when ALS > thresh
|
||
|
|
(0 * dark-gain), and a 1.35 compensation factor when ALS < thresh.
|
||
|
|
|
||
|
|
Example:
|
||
|
|
|
||
|
|
usd5182@39 {
|
||
|
|
compatible = "upisemi,usd5182";
|
||
|
|
reg = <0x39>;
|
||
|
|
upisemi,glass-coef = < 1000 >;
|
||
|
|
upisemi,dark-ths = /bits/ 16 <170 200 512 512 800 2000 4000 8000>;
|
||
|
|
upisemi,upper-dark-gain = /bits/ 8 <0x00>;
|
||
|
|
upisemi,lower-dark-gain = /bits/ 8 <0x16>;
|
||
|
|
};
|