HT45F65 datasheet(205/231 Pages) HOLTEK

205 / 231 page

Rev. 1.60

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Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

LCD Driver

Forlargevolumeapplications,whichincorporateanLCDintheirdesign,theuseofacustom

displayratherthanamoreexpensivecharacterbaseddisplayreducescostssignificantly.However,

thecorrespondingCOMandSEGsignalsrequired,whichvaryinbothamplitudeandtime,todrive

suchacustomdisplayrequiremanyspecialconsiderationsforproperLCDoperationtooccur.The

devicecontainsanLCDDriverfunction,whichwiththeirinternalLCDsignalgeneratingcircuitry

andvariousoptions,willautomaticallygeneratethesetimeandamplitudevaryingsignalstoprovide

ameansofdirectdrivingandeasyinterfacingtoarangeofcustomLCDs.

ThisdeviceincludesawiderangeofoptionstoenableLCDdisplaysofvarioustypestobedriven.

Thetableshowstherangeofoptionsavailableacrossthedevicerange.

Part No.

Duty

Bias

Bias Type

Wave Type

HT��F6�

1/�

1/3

A o� B

HT��F66

HT��F67

1/�

1/3

A o� B

1/6

C type and 1/3 Bias,

VAS=“1＂

VAB = 3/2 xVLCD = VA

VB = VLCD

VC = 1/2 x VLCD

Charge

Pump

VMAX

VLCD

0.1µF

VAB

C type and 1/3 Bias,

VAS =“0＂

VA = VLCD

VAB = 2/3 x VLCD = VB

VC = 1/3 x VLCD

Charge

Pump

0.1µF

VMAX

VLCD

VAB

C Type Bias Voltage Levels

Note:IfVAS="1",VLCD=VDDandVMAX=VAB

IfVAS="0",VLCD=VMAX=VDD

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