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參數(shù)資料
| 型號： | HI-8151SERIES |
| 廠商： | Holt Integrated Circuits |
| 英文描述： | CMOS High Voltage LCD Display Driver (30-38 Segments) |
| 中文描述： | CMOS高電壓液晶顯示驅(qū)動程序（30-38段） |
| 文件頁數(shù)： | 3/8頁 |
| 文件大小： | 247K |
| 代理商： | HI-8151SERIES |
HI-8050/51, HI-8150/51
FUNCTIONAL DESCRIPTION
INPUTLOGIC
BPOSCandBPIN
ThedataisclockedintoaserialshiftregisterfromtheDINin-
put on the negative edge of
normally held low and pulsed high only when data from the
shift register is parallel latched to the segment outputs.
mustbelowwhenLDispulsed. Thelatchesaretransparent
while LD is high. A logic "1" in the shift register causes the
corresponding segment output to be out of phase with the
BP output. All four logic inputs are TTL compatible on the
HI-8050/51andCMOScompatibleontheHI-8150/51.
while
is held low. LD is
Theuserhastheoptionofcreatingthebackplanefrequency
internally or providing a signal from an external source. For
an internal oscillator, BPIN and BPOSC are connected to-
gether and the appropriate R & C combination is applied as
showninFigure1. Theresultingbackplanefrequencyisap-
proximately:
f =
1
.
(R=220K , C=220pF, f
256 RC
100HZ)
Thevalueoftheresistormustbegreaterthan30K .
Alternatively,BPOSCisleftopenandanexternalbackplane
signalofthedesiredfrequencyisappliedtotheBPINinput.
CL
CS
CS
BP
≈
VEE& NEGATIVEVOLTAGECONVERTER
VEEcanbeconnectedtoanegativepowersupply. Alterna-
tively, the HI-8050 & HI-8150 have the option of generating
theVEEvoltagewithabuilt-in -25voltnegativevoltagecon-
verter(SeeFigure2). Whennotused,theopenCONVOSC
pin is detected and all power consuming circuitry is dis-
abled. The converter will survive a short between two seg-
mentsandstillmaintainaVEEvoltageof-20V.
DOUT
The DOUT30, DOUT32, and DOUT38 pins are available for
cascading devices to drive more segments (See Figure 3) and
for verifying the integrity of the shift register data. The outputs
can drive 2 TTL loads. They change on the positive edge of
.
CL
AUTOMATICSEGMENTSOFF
TESTINPUTS
A threshold device detects when the 5V supply is below ap-
proximately1V andforcesallthe segmentsand the backplane
to the same level. This feature is used to discharge the VEE
capacitorwhen the 5V power is switched off, to prolong the life
oftheLCDdisplay.
The
HI-8110 product (See Figure 5) if this pin is left open or held
high. Ifheldlow,thetwopinsfunctionthesameastheHI-8020
and HI-8120 product (See Figure 6). This input is available
onlyontheHI-8050(TTL)andHI-8150(CMOS)products.
and
inputs function the same as the HI-8010 and
Thetestfunctionsavailableare:
0
0
1
1
0
1
0
1
Normal
AllOff
AllOn
AlternatingOn/OffSegments
The test inputs must be tied to the appropriate logic level for
correct circuit operation. Both test inputs are TTL compatible
ontheHI-8050/51andCMOScompatibleontheHI-8150/51.
8020OPT
CL
CS
T2
T1
Display
ode
M
Figure 2. OPTIONAL VOLTAGE CONVERTER
CONVOSC
CONVOUT
330μH
V
SS
VEE
Control
OSC
V
DD
68K
IN5818, IN5819
10μF
V
DD
V
SS
SENSE
R
Figure 1. INTERNAL OSCILLATOR CIRCUIT
BPIN
TO BACKPLANE
TRANSLATOR
AND DRIVER
÷ 256
R
C
V
SS
BPOSC
C
R
Q
V
DD
HOLT INTEGRATED CIRCUITS
3
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