HOLT HI-8040QT, HI-8040QM-01, HI-8040Q Datasheet

September1999

HI-8040

GENERALDESCRIPTION

TheHI-8040isaCMOSintegratedcircuitdesignedforhigh
voltageLCDdisplaydriveapplications.Itcandrive85
segmentsatvoltagesbetween+5and-30volts.Anoptional
negativeconvertercangeneratethenegativedisplaydrive
voltage.Testinputsfacilitateopensandshortstesting.The
backplanefrequencyischeckedand,aslongaspoweris
available,thesegmentsareshut"Off"ifthefrequency
becomestoolow.

TheHI-8040ispartofafamilyofdisplaydriverswhich
controlsegmentinformationinthesameway.Datais
seriallyclockedintothedeviceandthedataforallsegment
out putsarelatchedinparallelwhentheLoadinput
transitionsfromhightolow.WiththeDataOutfromtheshift
registeravailable,devicesmaybecascadedtoobtainmore
segmentoutputs.Theshiftregisteris85bitslong.

Thedieismetalmaskprogrammabletoprovideforvarious
packageand/orcascadetapoptions.ConsultyourHolt
Salesrepresentativetoexplorethepossibilities.

APPLICATIONS

!

DichroicLiquidCrystalDisplays

!

StandardLiquidCrystalDisplays

PINCONFIGURATION (TopView)

S60
S61
S62
S63
S64
S65
S66
S67
S68
S69
S70
S71
S72
S73
S74
S75
S76
S77
S78
S79

81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99

100

100PINQUADCERPACK

50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31

S29
S28
S27
S26
S25
S24
S23
S22
S21
S20
S19
S18
S17
S16
S15
S14
S13
S12
S11
S10

FEATURES

!

4MHzserialinputdatarate

!

85segmentoutputs

!

Cascadable

!

5Voltinputstranslatedto35Volts

!

estpinsallowhardwareall"ON",all"OFF"or

T

alternating

!

Monitorsbackplaneoscillationandforcesall
segmentsto"OFF"conditionifbelow10Hz

!

Negativevoltageconverteravailableon-chip

!

CMOSlowpower

!

Militaryprocessingavailable

Seepage3-19formagnifiedview

FUNCTIONALBLOCKDIAGRAM

DIN

BPOSC

BPIN

Þ
Þ

CL

Þ

CS

LD

Þ

Oscillator

Þ
Þ

Divider

Voltage

Translator

HighVoltage

Buffer

Þ BP

DATAIN

85Stage

ShiftRegister

CLK

LE

85BitLatch

Voltage

Translators

HighVoltage

Drivers

85SEGMENTS

DOUT

85

HOLTINTEGRATEDCIRCUITS

3-15(DS8040Rev.NEW)9/99

FUNCTIONALDESCRIPTION

HI-8040

INPUTLOGIC

mustbeheldlowtoenterdataintotheshiftregister.

CS
Thedataisclockedonthenegativeedgeof.LDisnor-

CL
mallyheldlowandonlypulsedhighwhennewdataisready
fordisplay.WhenLDishighthelatchistransparent.Allfour
logicinputsareTTLcompatible.Alogic"1"atDINthatis
eventuallylatchedtothesegmentdriverswillcausetheseg­menttobeattheoppositevoltageleveloftheBPpin(outof
phase).

BPOSCandBPIN

Theusercaneithermakeanoscillatortocreatethe
backplanefrequencyordriveasignalintoBPINleaving
BPOSCopen.Tomakeanoscillator,pinsBPOSCand
BPINmustbeconnectedtogeth erandtheappropriateR
andCcombinationapplied(SeeFigure1).Iftheoscillatoris
used,thebackplanefrequencyisapproximately

f=.(forR=180KC=220pF,f100Hz).

BPBP

1

256RC

W&»

VEE&NEGATIVEVOLTAGECONVERTER

VEEmaybeexternallydriventoamaximum-30V.Alterna­tively,thereisavoltageconverterthatwillprovide-21.4volts
(SeeFigure2).Iftheconverterpinsareleftopencircuit,an
on-chipsenseresistorwillcauseshutdownofallcurrent
consumptionassociatedwiththeconverter.Theconverter
willsurviveashortedsegmentconditionandcontinueto
maintainVEEat-20volts.

DOUT

TheDOUTpinisavailablefromsegment85forcascading
devicestodrivemoresegmentsandforverifyingthedata
integrity.Thisoutputcandrive2TTLloads.Itchangesonthe
positiveedgeof.

CL

AUTOMATICSEGMENTSOFF

Theinternalbackplanesignalistestedcontinuouslytobeat
least10Hz.Ifthedetectorsensesf<10Hz,thenthesegments
areforcedtothesamevoltageasthebackplane(allsegments
in"OFF"state).However,thedetectorisonlyfunctionalwhile
VDDisabovetheminimumoperatingvoltagespecification.

TESTINPUTS

Thetestfunctionsavailableare:

T2T1Display

00Normal
01AllOff
10AllOn
11AlternatingOn/OffSegments

Th etestinputsmustbetiedtotheappropriatelogiclevelfor
correctcircuitoperation.

V DD

R330K W

IN5818,IN5819

330µh

V SS

10µF

V SS

HOLTINTEGRATEDCIRCUITS

3-16

R

OSC

SENSE

Control

V DD