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value can be either controlled by the I C interface or by any of the sequencers (see section Sequencers on page 48 ).
ture if temp_int_ext (see page 24) =0, or a I C value stored in led_temp (see page 24) if temp_int_ext =1). This compen-
driving capability of the current sources is set by registers LED1_max (see page 20) , LED2_max ... LED9_max .
AS3665
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n C u r r e n t S o u r c e s
7. LED7, LED8 and LED9 have the option to be powered by VBAT directly (configured by
LED7_on_cp ... LED9_on_cp )
Interface to sequencers
pwm_LED1 (see page 22) , pwm_LED2 ... pwm_LED9 is the input PWM value of the current sources (8 bit value). This
2
Logarithmic/Linear Ramping
All current sources support logarithmic or linear ramping (selected by register bits loglin1 (see page 25) ,
loglin2 ... loglin9 ). As light is perceived logarithmically, it is recommended to keep the current sources in logarithmic
mode (default setting).
RGB Color Correction
The RGB Color correction changes the output PWM value depending on the temperature (either the junction tempera-
2
sates different temperature drifts of LEDs and keep the white point over temperature. The slope of this temperature
compensation is adjustable with the register color_slope1 (see page 25) , color_slope2 ... color_slope9 (set to 0 if the
color correction is not used).
Faders
There are three global faders: fader1 (see page 23) , fader2 and fader3 . Each current source can be configured to be
multiplied by any of the three faders (controlled by fader_src1 (see page 25) , fader_src2 ... fader_src9 ). Therefore a
fader can operate on any number of current sources in parallel (e.g. to generate smooth fade-out effects on several
LEDs). The faders can operate linear or logarithmic (defined by fader_loglin1 (see page 23) , fader_loglin2 and
fader_loglin3 ).
Analog Current Setting
All current sources can be completely enabled/disable by the register LED1_on , LED2_on ... LED9_on . The actual
analog current is set by LED_current1 (see page 17) , LED_current2 ... LED_current9 . The maximum current
6
Current Source Registers
Analog Current setting registers
Table 9. LED_Control1 Register
Addr: 02h
LED_Control1 Register
Bit
Bit Name
Default Access
Description
0
1
2
3
4
LED1_on
LED2_on
LED3_on
LED4_on
LED5_on
0b
0b
0b
0b
0b
R/W
R/W
R/W
R/W
R/W
0
1
0
1
0
1
0
1
0
1
LED1 is off
LED1 is enabled
LED2 is off
LED2 is enabled
LED3 is off
LED3 is enabled
LED4 is off
LED4 is enabled
LED5 is off
LED5 is enabled
6. Always use the minimum setting for LED1_max , LED2_max ... LED9_max suitable for the application to
reduce quiescent current of the internal current source
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