HT9B95 datasheet(10/32 Pages) HOLTEK

10 / 32 page

Rev. 1.10

November 25, 2015

HT9B95A/B/G

Functional Description

Power-On Reset

Whenthepowerisapplied,thedeviceisinitialized

byaninternalpower-onresetcircuit.Thestatusofthe

internalcircuitsafterinitializationisasfollows:

• AllcommonoutputsaresettoVSS.

• AllsegmentoutputsaresettoVSS.

• LCDDriverOutputWaveform:B-typeinversion.

• Internaloscillatorisselected.

• The1/3biasdrivemodeisselected.

• LCDbiasgeneratorisinanoffstate.

• LCDDisplayandinternaloscillatorareinoff

states.

• Powersavemodeissettonormalcurrent.

• FrameFrequencyissetto80Hz.

• Blinkingfunctionisswitchedoff

DatatransfersontheI2C-busshouldbeavoidedfor

1msfollowingpower-ontoallowcompletionofthe

resetaction.

System Oscillator

ThetimingfortheinternallogicandtheLCDdrive

signalsaregeneratedbytheinternaloscillator.The

SystemClockfrequency(fSYS)determinestheLCD

framefrequency.Duringinitialsystempoweronthe

SystemOscillatorwillbeinthestopstate.

Segment Driver Outputs

TheLCDdrivesectionincludesupto43segment

outputsSEG0~SEG42whichshouldbeconnected

directlytotheLCDpanel.Thesegmentoutputsignals

aregeneratedinaccordancewiththemultiplexed

commonsignalsandwiththedataresidentinthedisplay

latch.Theunusedsegmentoutputsshouldbeleft

open-circuit.

Column Driver Outputs

TheLCDdrivesectionincludesupto8column

outputsCOM0~COM7whichshouldbeconnected

directlytotheLCDpanel.Thecolumnoutputsignals

aregeneratedinaccordancewiththeselectedLCD

drivemode.Theunusedcolumnoutputsshouldbe

leftopen-circuitiflessthan8columnoutputsare

required.

Address Pointer

TheaddressingmechanismforthedisplayRAMis

implementedusingtheaddresspointer.Thisallows

theloadingofanindividualdisplaydatabyte,ora

seriesofdisplaydatabytes,intoanylocationofthe

displayRAM.Thesequencecommenceswiththeini-

tializationoftheaddresspointerbytheDisplayData

Inputcommand.

Display Memory – RAM Structure

ThedisplayRAMisstatic39x8bitsRAMwhich

storestheLCDdata.Logic“1”intheRAMbit-map

indicatesthe“on”stateofthecorrespondingLCD

segment;similarly,logic0indicatesthe‘off’state.

ThecontentsoftheRAMdataaredirectlymapped

totheLCDdata.ThefirstRAMcolumncorresponds

tothesegmentsoperatedwithrespecttoCOM0.

InmultiplexedLCDapplicationsthesegmentdata

from2ndto7thcolumnofthedisplayRAMaretime-

multiplexedwithCOM1toCOM7respectively.The

followingdiagramisadatatransferformatforI2C

interface.

MSB

LSB

SDA Data

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

LCD Display Output Data Transfer Format for I2C Bus

HT9B95 Datasheet(PDF) 10 Page - Holtek Semiconductor Inc

HT9B95 Datasheet(HTML) 10 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Datasheet Download

Link URL