AS3689 datasheet(18/72 Pages) AMSOSRAM

18 / 72 page

AS3689

austriami crosyst ems

Datasheet, Confidential

www.austriamicrosystems.com (mlg, ptr)

Revision 1.0.2 / 20070115

16 - 70

The charge pump mode switching can be done manually or automatically with the following possible software

settings:

Automatic up all modes allowed (1:1, 1:1.5, 1:2)

−

Start with 1:1 mode

−

Switch up automatically 1:1 to 1:1.5 to 1:2

Automatic up, but only 1:1 and 1:1.5 allowed

−

Start with 1:1 mode

−

Switch up automatically only from 1:1 to 1:1.5 mode; 1:2 mode is not used

Manual

−

Set modes 1:1, 1:1.5, 1:2 by software

Figure

12 – Charge Pump Pin Connections

Charge Pump

1:1, 1:1.5, 1:2

400mA

Battery

VBAT1

C2_P

1µF

C2_N

C1_P

1µF

C1_N

CPOUT

1µF

2.2µF

VSS_CP

The Charge Pump requires the external components listed in the following table:

Table

8 – Charge Pump External Components

Symbol

Parameter

Min

Typ

Max

Unit

Note

C5, C6, C7

External Flying

Capacitor (2x)

1.0

µ F

Ceramic low-ESR capacitor between

pins C1_P and C1_N, between pins

C2_P and C2_N and between VBAT1

and VSS. Use nominal 1.0µF

capacitors (size 0402)

External Storage

Capacitor

1.5

(@3.3V)

2.2

µ F

Ceramic low-ESR capacitor between

pins CP_OUT and VSS, pins

CP_OUT and VSS. Use nominal

2.2µF capacitors (size 0603)

Note:

1.) The connections of the external capacitors C5, C6, C7 and C8 should be kept as short as possible.

2.) The maximum voltage on the flying capacitors C6 and C7 is VBAT

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