HT45F75 datasheet(99/190 Pages) HOLTEK

99 / 190 page

Rev. 1.10

De�e��e� 1�� 01�

Rev. 1.10

De�e��e� 1�� 01�

HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

Internal Power Supply

ThisdevicecontainstheLDOandVCMfortheregulatedpowersupply.Theaccompanying

blockdiagramillustratesthebasicfunctionaloperation.TheinternalLDOcanprovidethefixed

voltageforPGA,ADCortheexternalcomponents;aswelltheVCMcanbeusedasthereference

voltageforADCmodule.TherearefourLDOvoltagelevels,2.4V,2.6V,2.9Vor3.3V,decidedby

LDOVS1~LDOVS0bitsinthePWRCregister,aswelltheVCMhastwooutputvoltagelevels,

1.05Vor1.25V,selectedbytheVCMSbitinthePGAC1register.TheLDOandVCMfunctions

canbecontrolledbytheENLDOandENVCMbitsrespectivelyandcanbepoweredofftoreduce

thepowerconsumption.Inaddition,theLDObypassfunctioncanbeenabledordisabledbythe

LDOBPSbitintheregister.

Bypass

ENLDO

LDO

VCM

�.�

3.3

1.05

1.�5

LDOVS[1:0]

Fo� PGA� ADC powe�

PGA

Analog �o��on �ode voltage

1.05V o� 1.�5V

VCMS

ENVCM

VDD

VOUT/AVDD

Fo� senso� powe�

VCM

LDOBPS

Internal Power Supply Block Diagram

Registers

Output Voltage

ADOFF

ENLDO

ENVCM

VOUT/AVDD

VCM

Disa�le

Ena�le

Disa�le

Ena�le

Disa�le

Ena�le

“x” �eans don’t �a�e

Power Control Table

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