전자부품 데이터시트 검색엔진 |
|
HT45R2K-C 데이터시트(PDF) 28 Page - Holtek Semiconductor Inc |
|
HT45R2K-C 데이터시트(HTML) 28 Page - Holtek Semiconductor Inc |
28 / 105 page 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.��Ω� 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 |
유사한 부품 번호 - HT45R2K-C_15 |
|
유사한 설명 - HT45R2K-C_15 |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |