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HT45F3W 데이터시트(PDF) 140 Page - Holtek Semiconductor Inc

부품명 HT45F3W
상세설명  HT45F3W
PDF  167 Pages
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45F3W 데이터시트(HTML) 140 Page - Holtek Semiconductor Inc

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Rev. 1.50
140
De�e��e� 01� �01�
Rev. 1.50
141
De�e��e� 01� �01�
HT45F3W
R-Type Blood Pressure Meter Flash MCU
HT45F3W
R-Type Blood Pressure Meter Flash MCU
Charge Pump and Voltage Regulator
Theredeviceincludesachargepumpandonevoltageregulatorforgenerationofaconstant3.3Vvoltage.
Operation
Thechargepumpcanbeenabledordisableddependingontheapplication.Thechargepumpacts
asavoltagedoublerwithVDDasitsinput.Theoutputvoltageofchargepumpwillthereforebe
VDD×2.Thisvoltageisprovidedtotheregulatorinputwhichwillinturngenerateastable3.3V
voltage,whichcanbeusedbytheA/Dconverterorasanexternalsensorexcitationvoltageorother
applications.Itisnecessarythatthechargepumpprovidesaminimumoutputvoltageofgreaterthan
3.6Vtoprovidetheregulatorwithitsminimumoperatingvoltageforproper3.3Vvoltagegeneration.
Theblockdiagramofthesetwofunctionsisshownbelow:
Cha�ge Pu�p
(Voltage Dou�le�)
Regulato�
(3.3V)
ADC
OPA
WDT
PGA
SCF
VOCHP
VOREG
CHPC1
CHPC�
VDDCH
VDDCH x �
Divide�
fS
CHPCKD
REGCEN
CHPEN
VDDCH
VSSCH
3.3V
Thechargepumpapplicationcircuitisshownbelow:
HT45F3W
CHPC1
PC�/CHPC�
VOCHP
VOREG/AVDD
VSS/AVSS/VSSCH
C1
C�
C3
Charge pump Circuit
Note:1.C1uses10μFMLCCcapacitor.
2.C2andC3use1μF~10μFElectrolyticcapacitor
3.WhenenteringtheHALTmode,thehardwarewillturnofftheChargepumpautomaticallyto
preventthechargepumpoutputbeinginanunknownstate.DuringthistimetheLCDcannotbe
used.



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