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HT45R2K-C Fiches technique(PDF) 64 Page - Holtek Semiconductor Inc

No de pièce HT45R2K-C
Description  Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
Download  105 Pages
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Fabricant  HOLTEK [Holtek Semiconductor Inc]
Site Internet  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R2K-C Fiches technique(HTML) 64 Page - Holtek Semiconductor Inc

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Rev. 1.40
64
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Rev. 1.40
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HT45R2K-C/-B/-A
Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
HT45R2K-C/-B/-A
Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
Additionally,thedevicealsoincludesabandgapvoltagegeneratorforthe1.5Vlowtemperature
sensitivereferencevoltage.Thisreferencevoltageisusedasthezeroadjustmentandforasingle
endtypereferencevoltage.
VO BG P
C FI L
BG PQ ST
(S FR b it s)
0: O ff (s hor t)
1: O n
R egul at or
B and Ga p
E nhanc e
R EF I
R FI L
RFILisabout100KΩandtherecommendCFILis10μF.
Note:TheVOBGPsignalisonlyforinternalused.Itmustnotbeconnectedtoexternalcomponentsexcept
fortherecommendCFILcapacitor.
ThereisasingleregisterassociatedwiththismodulenamedCHPRC.TheCHPRCistheCharge
Pump/RegulatorControlregister,whichcontrolsthechargepumpon/off,regulatoron/offfunctions
aswellasaclockdividervaluetogeneratethechargepumpclock.TheCHPCKD4~CHPCKD0
bitsareusetosettheclockdividertogeneratethedesiredclockfrequencyforproperchargepump
operation.Theactualfrequencyisdeterminedbythefollowingformula.
ActualChargePumpClock=(fSYS/16)/(CHPCKD+1).
CHPRC Register
Bit
7
6
5
4
3
2
1
0
Name
CHPCKD4 CHPCKD3 CHPCKD� CHPCKD1 CHPCKD0 BGPQST CHPEN
REGEN
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit7~3
CHPCKD4
~CHPCKD0:TheChargepumpclockdivider
These5bitsselecttheclockdividerrationof1~32.
ChargePumpclock=(fSYS/16)/(CHPCKD+1)
Bit2
BGPQST:Bandgapquickstart-upfunction
0:Rshort,quicklystart
1:Rconnected,normalRCfiltermode
EverytimewhenREGENchangesfrom0to1(regulatorturnson),thisbitshouldbe
setto0andthensetto1tomakesuretheBandgapstabilisesquickly(Theminimum
timeisabout2msnow).
Bit1
CHPEN:ChargePumpon/offcontrol
0:disable
1:enable
Note:thisbitwillbeignorediftheREGENisdisabled.
Bit0
REGEN:Regulator/Charge-Pumpmoduleon/offcontrol
0:disable
1:enable


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