參數(shù)資料
型號(hào)： ICM7231BFIJL
廠商： INTERSIL CORP
元件分類： 顯示驅(qū)動(dòng)器
英文描述： Numeric/Alphanumeric Triplexed LCD Display Drivers
中文描述： LIQUID CRYSTAL DISPLAY DRIVER, CDIP40
封裝： CERDIP-40
文件頁(yè)數(shù)： 8/16頁(yè)
文件大?。?/td> 103K
代理商： ICM7231BFIJL
9-26
ICM7231 Family Description
The ICM7231 drives displays with 8 seven-segment digits with
two independent annunciators per digit, accepting six data
bits and three digit address bits from parallel inputs controlled
by a chip select input. The data bits are subdivided into four
binary code bits and two annunciator control bits.
The ICM7232 drives 10 seven-segment digits with two inde-
pendent annunciators per digit. To write into the display, six
bits of data and four bits of digit address are clocked serially
into a shift register, then decoded and written to the display.
Input levels are TTL compatible, and the DATA ACCEPTED
output on the serial input devices will drive one LSTTL load.
The intermediate voltage levels necessary to drive the dis-
play properly are generated by an on-chip resistor string,
and the output of a totally self-contained on-chip oscillator is
used to generate all display timing. All devices in this family
have been fabricated using Intersil’ MAXCMOS
process
and all inputs are protected against static discharge.
Triplexed (
1
/
3
Multiplexed) Liquid Crystal Displays
Figure 4 shows the connection diagram for a typical
7-segment display with two annunciators such as would be
used with an ICM7231 or ICM7232 numeric display driver.
Figure 5 shows the voltage waveforms of the common lines
and one segment line, chosen for this example to be the “a,
g, d” segment line. This line intersects with BP1 to form the
“a” segment, BP2 to form the “g” segment and BP3 to form
the “d” segment. Figure 5 also shows the waveform of the “a,
g, d” segment line for four different ON/OFF combinations of
the “a”, “g” and “d” segments. Each intersection (segment or
annunciator) acts as a capacitance from segment line to
common line, shown schematically in Figure 6. Figure 7
shows the voltage across the “g” segment for the same four
combinations of ON/OFF segments used in Figure 5.
FIGURE 3. ICM7232 INPUT TIMING DIAGRAM, LEAVING BOTH ANNUNCIATORS OFF
Timing Diagrams
DATA
CLOCK
INPUT
DATA
INPUT
WRITE
INPUT
RESETS SHIFT REGISTER
AND INPUT CONTROL
LOGIC WHEN DATA
ACCEPTED HIGH
DECODES AND STORES
DATA, RESETS SHIFT
REGISTER AND LOGIC
WHEN DATA ACCEPTED
IS LOW
DO NOT CARE
t
CI
t
CI
t
DS
t
DH
t
WLL
t
WP
DATA
ACCEPTED
OUTPUT
1
2
3
7
8
BD0
t
CWS
t
WP
t
ODH
t
ODI
BD1
BD2
VA2
DA3
AN1
ENTER
FIRST
AN2
BD0
BD1
BD2
BD3
A0
A1
A2
A3
ENTER
LAST
ICM7232 WRITE ORDER
a
b
c
d
f
g
e
BP1
BP2
BP3
an
2
an
1
BACKPLANE CONNECTIONS
a
b
c
d
f
g
e
SEGMENT LINES
an
2
an
1
SEGMENT LINE CONNECTIONS
FIGURE 4. CONNECTION DIAGRAMS FOR TYPICAL
7-SEGMENT DISPLAYS
ICM7231, ICM7232
MAXCMOS
is a registered trademark of Intersil Corporation.
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ICM7231BFIPL 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Harris Corporation 功能描述:
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ICM7231CFIPL 制造商:Maxim Integrated Products 功能描述:- Rail/Tube
ICM7232 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Numeric/Alphanumeric Triplexed LCD Display Drivers
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