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CA3162E Datasheet(PDF) 5 Page - Renesas Technology Corp

No. de pieza CA3162E
Descripción Electrónicos  A/D Converters for 3-Digit Display
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

CA3162E Datasheet(HTML) 5 Page - Renesas Technology Corp

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CA3162
FN1080 Rev.3.00
Page 5 of 8
Apr 2002
CA3162E Liquid Crystal Display (LCD) Application
Figure 3 shows the CA3162E in a typical LCD application.
LCDs may be used in favor of LED displays in applications
requiring lower power dissipation, such as battery-operated
equipment, or when visibility in high-ambient-light conditions is
desired.
Multiplexing of LCD digits is not practical, since LCDs must be
driven by an AC signal and the average voltage across each
segment is zero. Three CD4056B liquid-crystal decoder/drivers
are therefore used. Each CD4056B contains an input latch so
that the BCD data for each digit may be latched into the
decoder using the inverted digit-select outputs of the CA3162E
as strobes.
The capacitors on the outputs of inverters G3 and G4 filter out
the decode spikes on the MSD and NSD signals. The capaci-
tors and pull-up resistors connected to the MSD, NSD and LSD
outputs are there to shorten the digit drive signal thereby pro-
viding proper timing for the CD4056B latches.
Inverters G1 and G2 are used as an astable multivibrator to
provide the AC drive to the LCD backplane. Inverters G3, G4
and G5 are the digit-select inverters and require pull-up resis-
tors to interface the open-collector outputs of the CA3162E to
CMOS logic. The BCD outputs of the CA3162E may be con-
nected directly to the corresponding CD4056B inputs (using
pull-up resistors). In this arrangement, the CD4056B decodes
the negative sign (-) as an “L” and the positive overload indica-
tor (E) as an “H”.
The circuit as shown in Figure 3 using G7, G8 and G9 will
decode the negative sign (-) as a negative sign (-), and the
positive overload indicator (E) as “H”.
FIGURE 3. TYPICAL LCD APPLICATION
+5V
TO LSD
OF LCD
+5V
TO MSD
OF LCD
+5V
TO NSD
OF LCD
1
6
4
2
3
5 78
16
CD4056B
15k
100k
0.63
F
TO LCD
BACKPLANE
1
6
4
2
3
5 78
16
CD4056B
1
6
4
2
3
5 78
16
CD4056B
0.047
0.27
F
ZERO
50k
“HOLD”
VIN+
GAIN
10k
+5V
12
14
8
9
11
10 13
4
3
5
16
15
1
2
7
MSD
VIN-
NSD
LSD
23
22
21
20
F
0.047
F
G1 - G6: CD4049UB
HEX INVERTER
G7, G8, G9: CD4023B
TRIPLE 3 INPUT NAND GATE
0.047
F
G7
G9
G8
0.047
F
0.047
F
4 x
100k
6 x
10k
G3
G4
G5
+5V
CA3162E


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