AS3665 datasheet(30/78 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 h a r g e P u m p

Charge Pump

The charge pump used the two flying capacitors CFLY1 and CFLY2 to operate in 1:1, 1:1.5 and 1:2 mode boosting the

input supply VBAT to VOUT (shown in Figure 19). An implemented soft start mechanism reduces the inrush current.

Battery current is smoothed when switching the charge pump on and also at each switching condition. This precaution

reduces electromagnetic radiation significantly.

Figure 19. Charge Pump

Table 36. Driver_Setup9 Register

Addr: A8h

Driver_Setup9 Register

Bit

Bit Name

Default Access

Description

4:0

color_slope9

00h

R/W

LED9 RGB Color Correction (see page 16) slope

00h

RGB Color Correction disabled

01h

+0.15%/ºC

...

0Fh

+2.263%/ºC

11h

-2.263%/ºC

...

1Fh

-0.15%/ºC

loglin9

R/W

LED9 Logarithmic/Linear Ramping (see page 16)

linear ramping/dimming

logarithmic ramping/dimming

7:6

fader_src9

00b

R/W

LED9 Faders (see page 16)

fader disabled

use fader1 (see page 23)

use fader2

use fader3

) *+ ,

'(-

. *

+ /

0/ &

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