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HT67F5652 bảng dữ liệu(PDF) 183 Page - Holtek Semiconductor Inc |
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HT67F5652 bảng dữ liệu(HTML) 183 Page - Holtek Semiconductor Inc |
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183 / 224 page ![]() Rev. 1.00 18� De�e��e� 0�� �01� Rev. 1.00 183 De�e��e� 0�� �01� HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU HT67F5652 24-Bit Delta Sigma A/D + LCD Flash MCU Low Voltage Detector – LVD EachdevicehasaLowVoltageDetectorfunction,alsoknownasLVD.Thisenabledthedeviceto monitorthepowersupplyvoltage,VDD,andprovideawarningsignalshoulditfallbelowacertain level.Thisfunctionmaybeespeciallyusefulinbatteryapplicationswherethesupplyvoltagewill graduallyreduceasthebatteryages,asitallowsanearlywarningbatterylowsignaltobegenerated. TheLowVoltageDetectoralsohasthecapabilityofgeneratinganinterruptsignal. LVD Register TheLowVoltageDetectorfunctioniscontrolledusingasingleregisterwiththenameLVDC.Three bitsinthisregister,VLVD2~VLVD0,areusedtoselectoneofeightfixedvoltagesbelowwhich alowvoltageconditionwillbedetermined.AlowvoltageconditionisindicatedwhentheLVDO bitisset.IftheLVDObitislow,thisindicatesthattheVDDvoltageisabovethepresetlowvoltage value.TheLVDENbitisusedtocontroltheoverallon/offfunctionofthelowvoltagedetector. Settingthebithighwillenablethelowvoltagedetector.Clearingthebittozerowillswitchoffthe internallowvoltagedetectorcircuits.Asthelowvoltagedetectorwillconsumeacertainamountof power,itmaybedesirabletoswitchoffthecircuitwhennotinuse,animportantconsiderationin powersensitivebatterypoweredapplications. • LVDC Register Bit 7 6 5 4 3 2 1 0 Na�e — — LVDO LVDEN — VLVD� VLVD1 VLVD0 R/W — — R R/W — R/W R/W R/W POR — — 0 0 — 0 0 0 Bit7~6 Unimplemented,readas"0" Bit5 LVDO:LVDOutputFlag 0:NoLowVoltageDetect 1:LowVoltageDetect Bit4 LVDEN:LowVoltageDetectorControl 0:Disable 1:Enable Bit3 Unimplemented,readas"0" Bit2~0 VLVD2~VLVD0:SelectLVDVoltage 000:2.0V 001:2.2V 010:2.4V 011:2.7V 100:3.0V 101:3.3V 110:3.6V 111:4.0V |
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