HV632 Datasheet, PDF (1/8 Pages) Supertex, Inc – 32-Channel 256 Gray-Shade High Voltage Driver

HV632
HV632
Initial Release
32-Channel 256 Gray-Shade High Voltage Driver
Features
❏ HVCMOS^® technology
❏ 5V CMOS inputs
❏ Up to 80V output voltage
❏ PWM gray shade conversion
❏ Capable of 256 levels of gray shading
❏ 10MHz shift and count clock frequency
❏ 20MHz data throughput rate
❏ 8 bit data bus
❏ 32 outputs per device
❏ BLANK function
❏ Output polarity control
Applications
❏ Field Emission Displays (FED)
❏ Polymer Liquid Crystal Displays (PLCD)
❏ Vacuum Fluorescent Displays (VFD)
Typical Application
General Description
The HV632 is a 32-channel gray-shade column driver IC de-
signed for driving electrofluorescent displays. Using Supertex’s
unique HVCMOS^® technology, it is capable of 256 levels of gray
shading by PWM conversion.
Input data, in groups of eight, is latched into a set of data latches
on both edges of the shift clock. The data shifted in the first data
latch corresponds to HV_OUT1, the second data latch corresponds
to HV_OUT2, and so on. These data are compared to the contents
of the master binary counter which counts on both edges of the
count clock. Each time the master counter begins to decrement
from 1111 1111, the data in the data latches are compared with
the contents of the counter; if they match, the corresponding
outputs will go high. The master counter counts down to 0000
0001 and then starts to count up again. The outputs that are at
high will stay at high until the contents of the counter match the
data in the data latches again. Therefore, the higher the binary
data in the data latches, the longer the outputs will stay at high.
Thus, different high voltage pulse widths are produced. When
the counter reaches its 1111 1111 count while counting up,
the device is ready for the next operation cycle. A data value of
0000 0000 produces no pulse; the output stays low.
The BLANK input signal will reset the master counter to all ones
(1111 1111) and set all high voltage outputs to low, or will set all
high voltage outputs to high state, when the POL is low. The POL
input signal, forced low, will invert the polarity of the output pulse.
If left unconnected, POL input will be pulled high to V_DD by an on-
chip resistor.
Micro
Processor
Low Voltage
Power Supply
High Voltage
Power Supply
DIN(1-8)
Supertex HV632
SC _{Low Voltage}
High Voltage
HVout1
CSI
CC
32
Level
Translators
LC
Latches
Counter
&
Pus h-Pul l
BL ^Comparators
POL
Output
Buffers
CSO
HVout32
Colunms
(Cathodes)
Display
Panel
(FED)
Scan
Driver
HV57908
Shift Register
CSI for cascading the next HV632
07/08/03
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
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