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HI-8151PQTF Datasheet(PDF) 3 Page - Holt Integrated Circuits

Part # HI-8151PQTF
Description  CMOS High Voltage Display Driver
Download  8 Pages
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Manufacturer  HOLTIC [Holt Integrated Circuits]
Direct Link  http://www.holtic.com
Logo HOLTIC - Holt Integrated Circuits

HI-8151PQTF Datasheet(HTML) 3 Page - Holt Integrated Circuits

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HI-8050/51, HI-8150/51
FUNCTIONAL DESCRIPTION
INPUT LOGIC
BPOSC and BPIN
The data is clocked into a serial shift register from the DIN in-
put on the negative edge of
while
is held low. LD is
normally held low and pulsed high only when data from the
shift register is parallel latched to the segment outputs.
must be low when LD is pulsed. The latches are transparent
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-8050/51and CMOS compatible on the HI-8150/51.
The user has the option of creating the backplane frequency
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
shown in Figure 1. The resulting backplane frequency is ap-
proximately:
f =
1
.
(R = 220K , C = 220pF, f
100HZ)
The value of the resistor must be greater than 30K .
Alternatively, BPOSC is left open and an external backplane
signal of the desired frequency is applied to the BPIN input.
CL
CS
CS
BP
BP
»
W
W
VEE & NEGATIVE VOLTAGE CONVERTER
VEE can be connected to a negative power supply. Alterna-
tively, the HI-8050 & HI-8150 have the option of generating
the VEE voltage with a built-in -25 volt negative voltage con-
verter (See Figure 2). When not used, the open CONVOSC
pin is detected and all power consuming circuitry is dis-
abled. The converter will survive a short between two seg-
ments and still maintain a VEE voltage of -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
AUTOMATIC SEGMENTS OFF
TEST INPUTS
A threshold device detects when the 5V supply is below ap-
proximately 1V and forces all the segments and the backplane
to the same level. This feature is used to discharge the VEE
capacitor when the 5V power is switched off, to prolong the life
of the LCD display.
The
and
inputs function the same as the HI-8010 and
HI-8110 product (See Figure 5) if this pin is left open or held
high. If held low, the two pins function the same as the HI-8020
and HI-8120 product (See Figure 6). This input is available
only on the HI-8050 (TTL) and HI-8150 (CMOS) products.
The test functions available are:
0
0
Normal
0
1
All Off
1
0
All On
1
1
Alternating On/Off Segments
The test inputs must be tied to the appropriate logic level for
correct circuit operation. Both test inputs are TTL compatible
on the HI-8050/51 and CMOS compatible on the HI-8150/51.
8020OPT
CL
CS
T2
T1
Display
ode
M
256 RC
Figure 2. OPTIONAL VOLTAGE CONVERTER
CONVOSC
CONVOUT
VEE
Control
OSC
VDD
68K
W
IN5818, IN5819
330µH
10µF
VDD
VSS
VSS
SENSE
R
Figure 1. INTERNAL OSCILLATOR CIRCUIT
BPIN
TO BACKPLANE
TRANSLATOR
AND DRIVER
÷ 256
R
C
VSS
BPOSC
C
R
Q
VDD
HOLT INTEGRATED CIRCUITS
3


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