AS3820 datasheet(19/52 Pages) DIALOG

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AS3820

16-Channel White LED Controller for LCD Backlight

Rev. 1.1

Datasheet

www.dialog-semiconductor.com

19 of 52

05-Feb-2019

Addr: 0x10

IDAC_FB1_COUNTER

Bit

Bit Name

Default

Access

Bit Description

7:0

IDAC_FB1_COUNTER

00000000

Feedback 1 counter value. Can be

overwritten if

Fb_cnt_man_fb1 = 1

0x00... FB-current 0μA

0xFF... FB-current 255μA

Table 15: IDAC_FB1_COUNTER

Addr: 0x11

IDAC_FB12_COUNTER

Bit

Bit Name

Default

Access

Bit Description

7:0

IDAC_FB2_COUNTER

00000000

Feedback 1 counter value. Can be

overwritten if

Fb_cnt_man_fb2 = 1

0x00... FB-current 0μA

0xFF... FB-current 255μA

Table 16: IDAC_FB2_COUNTER

Addr: 0x12

FBLOOP_CTRL

Bit

Bit Name

Default

Access

Bit Description

7:6

Vtrip

Select gate trip voltage for feedback

00...5*(VDD/6)

01... 4*(VDD/6)

10... 3*(VDD/6)

11... 2*(VDD/6)

Fb_cnt_man_fb2

0...FB2 counter runs automatically in

feedback loop

1...FB2 counter is set manual

Fb_cnt_man_fb1

0...FB1 counter runs automatically in

feedback loop

1...FB1 counter is set manual

3:2

Fbcount_dn_time

FB1 and FB2 counter down counting

clock cycle(1)

00...512μs

01...2048μs

10...4096μs

11...8192μs

1:0

Fbcount_up_time

FB1 and FB2 counter up counting clock

cycle

00...1024μs

01... 256μs

10... 64μs

11... 16μs

Note 1.

Down counting starts after 200ms delay time.

Table 17: FBLOOP_CTRL

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