HT45F5Q datasheet(34/114 Pages) HOLTEK

34 / 114 page

Rev. 1.10

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HT45F5Q

Charger Flash MCU

HT45F5Q

Charger Flash MCU

Internal RC Oscillator – HIRC

TheinternalRCoscillatorisafullyintegratedsystemoscillatorrequiringnoexternalcomponents.

The internal RC oscillator has a fixed frequency of 8MHz. Device trimming during the

manufacturingprocessandtheinclusionofinternalfrequencycompensationcircuitsareusedto

ensurethattheinfluenceofthepowersupplyvoltage,temperatureandprocessvariationsonthe

oscillationfrequencyareminimised.Asaresult,atapowersupplyof5Vandattemperatureof25˚C

degrees,thefixedoscillationfrequencyoftheHIRCwillhaveatolerancewithin2%.

Internal 32kHz Oscillator – LIRC

Theinternal32kHzSystemOscillatoristhelowfrequencyoscillator.Itisafullyintegrated

RCoscillatorwithatypicalfrequencyof32kHzat5V,requiringnoexternalcomponentsforits

implementation.Devicetrimmingduringthemanufacturingprocessandtheinclusionofinternal

frequencycompensationcircuitsareusedtoensurethattheinfluenceofthepowersupplyvoltage,

temperatureandprocessvariationsontheoscillationfrequencyareminimised.

Supplementary Oscillator

Thelowspeedoscillator,inadditiontoprovidingasystemclocksourceisalsousedtoprovide

aclocksourcetotwootherdevicefunctions.ThesearetheWatchdogTimerandtheTimeBase

Interrupts.

HT45F5Q Datasheet(PDF) 34 Page - Holtek Semiconductor Inc