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HV632_13 Datasheet, PDF (1/9 Pages) Supertex, Inc – 32-Channel, 256 Gray-Shade High Voltage Driver | |||
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Supertex inc.
HV632
32-Channel,
256 Gray-Shade High Voltage Driver
Features
âºâºHVCMOS® technology
âºâº5.0V CMOS inputs
âºâºOutput voltage up to +80V
âºâºPWM gray shade conversion
âºâº Capable of 256 levels of gray shading
âºâº10MHz shift and count clock frequency
âºâº 20MHz data throughput rate
âºâº8 bit data bus
âºâº32 outputs per device
âºâº BLANK function
âºâºOutput polarity control
Applications
âºâºField Emission Displays (FED)
âºâºPolymer Liquid Crystal Displays (PLCD)
âºâºVacuum Fluorescent Displays (VFD)
General Description
The HV632 is a 32-channel gray-shade column driver IC designed for
driving electrofluorescent displays. Using Supertexâs 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 HVOUT1, the second data latch corresponds to HVOUT2, 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 00000001 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 VDD by an on-chip resistor.
Typical Application Circuit
Low Voltage
Power Supply
High Voltage
Power Supply
DIN(1-8)
HV632
High Voltage
HVOUT1
SC
Micro
Processor
CSI
CC
LC
BL
Low Voltage
Level
Translators
Latches
32
Counter
Comparators
&
Push-Pull
Output
Buffers
POL
CSO
Shift Register
CSI for cascading the next HV632
HVOUT32
Columns
(Cathodes)
Display
Panel
(FED)
Scan
Driver
HV57908
Doc.# DSFP-HV632
A061913
Supertex inc.
www.supertex.com
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