AS3689 datasheet(20/72 Pages) AMSOSRAM

20 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

18 - 70

Figure

13 – Automatic Mode Switching

Charge Pump

1:1, 1:1.5, 1:2

400mA

Battery

VBAT1

C2_P

1.0µF

C2_N

C1_P

1.0µF

C1_N

CPOUT

2.2µF

CURR30

CURR31

CURR32

CURR33

...

RGB1

RGB3

CURR1

CURR2

CURR41

CURR43

200mV

(curr3x_switch)

200mV

(currlv_switch)

450mV

(currhv_switch)

curr30_on_cp

curr31_on_cp

curr32_on_cp

curr33_on_cp

rgb1_on_cp

rgb3_on_cp

curr1_on_cp

curr2_on_cp

curr41_on_cp

curr43_on_cp

Debounce

cp_start_debounce

Mode Switching

1:1 -> 1:1.5

1:1.5 -> 1:2

cp_mode<1:0>

CURR6

curr6_on_cp

CURR52

curr52_on_cp

curr51_on_cp

CURR51

7.3.2 Soft Start

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.

7.3.3 Charge Pump Registers

Reg. Control

Addr: 00h

This register enables/disables the LDOs, Charge Pumps, Charge Pump LEDs, current

sinks, the Step Up DC/DC Converter.

Bit

Bit Name

Default

Access

Description

cp _on

R/W

0 = Set Charge Pump into 1:1 mode (off state) unless

cp_auto_on is set

1 = Enable manual or automatic mode switching – see

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