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HT45R2K-C 데이터시트(PDF) 28 Page - Holtek Semiconductor Inc

부품명 HT45R2K-C
상세설명  Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT45R2K-C 데이터시트(HTML) 28 Page - Holtek Semiconductor Inc

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Rev. 1.40
�8
�a��� 1�� �01�
Rev. 1.40
�9
�a��� 1�� �01�
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
External Crystal/Ceramic Oscillator – HXT
TheExternalCrystal/CeramicSystemOscillatorisoneofthesystemoscillatorchoices,whichis
selectedviaconfigurationoptions.Formostcrystaloscillatorconfigurations,thesimpleconnection
ofacrystalacrossOSC1andOSC2willcreatethenecessaryphaseshiftandfeedbackfor
oscillation,withoutrequiringexternalcapacitorsandresistors.However,ifaresonatorinsteadof
crystalisconnectedbetweenOSC1andOSC2,toensureoscillation,itmaybenecessarytoaddtwo
smallvaluecapacitors,C1andC2.Usingaceramicresonatorwillusuallyrequiretwosmallvalue
capacitors,C1andC2,tobeconnectedforoscillationtooccur.ThevaluesofC1andC2shouldbe
selectedinconsultationwiththecrystalorresonatormanufacturer’sspecification.
Foroscillatorstabilityandtominimisetheeffectsofnoiseandcrosstalk,itisimportanttoensure
thatthecrystalandanyassociatedresistorsandcapacitorsalongwithinterconnectinglinesareall
locatedasclosetotheMCUaspossible.
To i nt er nal
ci rc ui ts
Ho lt ek MC U
C1
C2
Rf
No te :1 . Rp i s nor ma ll y not r equi r ed.
3. A lt hough not s how n pi ns h av e a pa ra si ti c
c apac it an ce o f a r ound 7pF .
OS C1
OS C2
Ex te rn al C ry st al / Ce ra mi c O sci lla to r
Rp
External RC Oscillator – ERC
Using t�e ERC os�illato� only �equi�es t�at a �esisto�� wit� a value between �4kΩand
1.��� is �onne�ted between OSC1 and VDD� and a �apa�ito� is �onne�ted between
OSC1 and g�ound� p�oviding a low �ost os�illato� �onfigu�ation. It is only t�e exte�nal
�esisto� t�at dete�mines t�e os�illation f�equen�y; t�e exte�nal �apa�ito� �as no influen�e
ove� t�e f�equen�y and is �onne�ted fo� stability pu�poses only. Devi�e t�imming du�ing t�e
manufa�tu�ing p�o�ess and t�e in�lusion of inte�nal f�equen�y �ompensation �i��uits a�e used
to ensure that the influence of the power supply voltage, temperature and process variations
on t�e os�illation f�equen�y a�e minimised. As a �esistan�e/ f�equen�y �efe�en�e point� it
�an be noted t�at wit� an exte�nal 1�0KΩ �esisto� �onne�ted and wit� a �V voltage powe�
supply and tempe�atu�e of �� ℃ deg�ees� t�e os�illato� will �ave a f�equen�y of 4�Hz
wit�in a tole�an�e of �%. He�e only t�e OSC1 pin is used� w�i�� is s�a�ed wit� I/O pin PA6�
leaving pin PA� f�ee fo� use as a no�mal I/O pin.
Fo� os�illato� stability and to minimise t�e effe�ts of noise and ��osstalk� it is impo�tant to
lo�ate t�e �apa�ito� and �esisto�as �lose to t�e �CU as possible.
OS C1
470p F
V DD
R OS C
PA 5
External RC Oscillator – ERC


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