AS3665 datasheet(17/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - D e ta 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

value can be either controlled by the I

2C interface or by any of the sequencers (see section Sequencers on page 48).

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-

ture if temp_int_ext (see page 24)=0, or a I

2C value stored in led_temp (see page 24) if temp_int_ext=1). This compen-

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

driving capability of the current sources is set by registers

LED1_max (see page 20), LED2_max...LED9_max

Current Source Registers

Analog Current setting registers

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

Table 9. LED_Control1 Register

Addr: 02h

LED_Control1 Register

Bit

Bit Name

Default Access

Description

LED1_on

R/W

LED1 is off

LED1 is enabled

LED2_on

R/W

LED2 is off

LED2 is enabled

LED3_on

R/W

LED3 is off

LED3 is enabled

LED4_on

R/W

LED4 is off

LED4 is enabled

LED5_on

R/W

LED5 is off

LED5 is enabled

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