* Texas Instruments - LM3697 Highly Efficient White LED Driver
The LM3697
11-bit LED driver provides high-
performance backlight dimming for
1,
2, or
3 series
LED strings while delivering up to
90% efficiency.
This device is suitable for display and keypad lighting
Required properties:
- compatible:
"ti,lm3697"
- reg : I2C slave address
- #address-cells :
1
- #size-cells :
0
Optional properties:
- enable-gpios : GPIO pin to enable/disable the device
- vled-supply : LED supply
Required child properties:
- reg :
0 - LED is Controlled by bank A
1 - LED is Controlled by bank B
- led-sources : Indicates which HVLED string is associated to which
control bank. This is a zero based property so
HVLED1 =
0, HVLED2 =
1, HVLED3 =
2.
Additional information is contained
in Documentation/devicetree/bindings/leds/common.txt
Optional child properties:
- ti,brightness-resolution - see Documentation/devicetree/bindings/mfd/ti-lmu.txt
- ramp-up-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
- ramp-down-us: see Documentation/devicetree/bindings/mfd/ti-lmu.txt
- label : see Documentation/devicetree/bindings/leds/common.txt
- linux,default-trigger :
see Documentation/devicetree/bindings/leds/common.txt
Example:
HVLED string
1 and
3 are controlled by control bank A and HVLED
2 string is
controlled by control bank B.
led-controller@
36 {
compatible = "ti,lm3697";
#address-cells = <
1>;
#size-cells = <
0>;
reg = <
0x36>;
enable-gpios = <&gpio1
28 GPIO_ACTIVE_HIGH>;
vled-supply = <&vbatt>;
led@
0 {
reg = <
0>;
led-sources = <
0 2>;
ti,brightness-resolution = <
2047>;
ramp-up-us = <
5000>;
ramp-down-us = <
1000>;
label = "white:first_backlight_cluster";
linux,default-trigger = "backlight";
};
led@
1 {
reg = <
1>;
led-sources = <
1>;
ti,brightness-resolution = <
255>;
ramp-up-us = <
500>;
ramp-down-us = <
1000>;
label = "white:second_backlight_cluster";
linux,default-trigger = "backlight";
};
}
For more product information please see the link below:
https://www.ti.com/lit/ds/symlink/lm3697.pdf
