AS3515_08 datasheet(34/67 Pages) AMSCO

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AS3515 V15

austriamicrosystems

Data Sheet, Confidential

www.austriamicrosystems.com

Revision 3.1

- 66

Table 33 CVDD trimming

CVDDp<1:0>

CVDD

Vnom (see )

Vnom – 50mV

Vnom - 100mV

Vnom - 150mV

This gives 0.85V to 1.8V as total range of the CVDD voltage.

Table 34 CVDD programming range

P_CVDD

CVDDp=11

CVDDp=10

CVDDp=01

CVDD=00

VSS

OFF

150k to VSS

0.85V

0.90V

0.95V

1.00V

Open

1.15V

1.10V

1.15V

1.20V

150k to DVDD

1.35V

1.40V

1.45V

1.50V

DVDD

1.65V

1.70V

1.75V

1.80V

Three different functional paths generate CVDD:

Direct length regulation from VB1V

Mode1=true IF ((VNOM+Vmargin1) < VB1V < (VTH1)) && (NoUSB)

Vmargin1=50mV/150mV (100mV Hysteresis)

VTH1=1.7V/1.8V (100mV Hysteresis)

•

VBAT LDO is used when VB1V>(VNOM+50mV) because length reg. is a 1ohm device.

•

VBAT LDO is used when VB1V<(1.8V) since Mode1 is efficient just with single battery cell.

•

VBAT LDO is not used when there is high supply present from USB even when VB1V is in range.

•

(there is no dependency on CHARGER_IN needed because with a charger a 4V LiIo battery is used anyway)

Direct length regulation from CPVDD

Mode2=true IF ((Not Mode1) && (CPVDD < (VNOM+Vmargin2)))

Vmargin2=200mV/300mV (100mV Hysteresis)

•

CPVDD LDO is used when VBAT LDO Mode1 is not entered and

•

CPVDD is not high enough to do 2:1 charge-pump regulation.

Charge-Pump CPVDD division by 2 active plus length regulation

Mode3=true IF ((Not Mode1) && (Not Mode2))

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