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数据搜索系统，热门电子元器件搜索 |
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HT69F360 数据表(PDF) 198 Page - Holtek Semiconductor Inc |
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HT69F360 数据表(HTML) 198 Page - Holtek Semiconductor Inc |
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198 / 235 page  Rev. 1.30 19� �ove��e� 1�� �01� Rev. 1.30 199 �ove��e� 1�� �01� HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM LCD Voltage Source and Biasing ThetimeandamplitudevaryingsignalsgeneratedbytheLCDDriverfunctionrequirethegeneration ofseveralvoltagelevelsfortheiroperation.ThedevicecanhaveeitherRtypeorCtypebiasing selectedviaasoftwarecontrolbitRCTintheLCDC1register.SelectingtheCtypebiasingwill enableaninternalchargepumpcircuitry. R Type Biasing ForRtypebiasinganexternalLCDvoltagesourcemustbesuppliedonpinVLCDtogeneratethe internalbiasingvoltages.Thiscouldbethemicrocontrollerpowersupplyorsomeothervoltage source.FortheRtype1/2biasselection,threevoltagelevelsVSS,VAandVBareutilised.The voltageVAisequaltotheexternallysuppliedvoltagesourceappliedtopinVLCD.ThevoltageVBis generatedinternallybythemicrocontrollerandwillhaveavalueequaltoVLCD/2.FortheRtype1/3 biasselection,fourvoltagelevelsVSS,VA,VBandVCareutilised.ThevoltageVAisequaltoVLCD. ThevoltageVBisequaltoVLCD×2/3whilethevoltageVCisequaltoVLCD×1/3. For1/2or1/3bias,differentvaluesofinternalbiasresistorscanbeselectedusingtheRSEL0and RSEL1bitsintheLCDC0register.ThisalongwiththevoltageonpinVLCDwilldeterminethebias current.TheconnectiontotheVMAXpindependsuponthevoltagethatisappliedtotheVLCDpin. IftheVDDvoltageisgreaterthanthevoltageappliedtotheVLCDpinthentheVMAXpinshould beconnectedtoVDD,otherwisetheVMAXpinshouldbeconnectedtopinVLCD.Notethatno externalcapacitorsorresistorsarerequiredtobeconnectedifRtypebiasingisused. R t y pe 1 /3 B ia s R R VL CD V A V B LC D Po we r Su pp ly V C R (= VL CD ´ 2/ 3) (= VL CD ´ 1/ 3) (= VL CD) LC D On /O ff VM AX R Type Bias Voltage Levels Condition VMAX Connection VDD > VLCD Connect VMAX to VDD Othe�wise Connect VMAX to VLCD R Type Bias Current VMAX Connection |
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