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CA3162
CA3162E Common-Cathode, LED Display Application
Figure 4 shows the CA3162E connected to a CD4511B
decode/driver to operate a common-cathode LED display.
Unlike the CA3161E, the CD4511B remains blank for all
BCD codes greater than nine. After 999mV the display
blanks rather than displaying EEE, as with the CA3161E.
When displaying negative voltage, the first digit remains
blank, instead of (-), and during a negative or positive over-
range the display blanks.
V+
The additional logic shown within the dotted area of Figure 4
restores the negative sign (-), allowing the display of
negative numbers as low as -99mV. Negative overrange is
indicated by a negative sign (-) in the MSD position. The rest
of the display is blanked. During a positive overrange, only
segment b of the MSD is displayed. One inverter from the
CD4049B is used to operate the decimal points. By connect-
ing the inverter input to either the MSD or NSD line either
DP1 or DP2 will be displayed.
DP1
100k ?
22k ?
1 / 6 CD4049UB
DP2
1 / 3
CD4049UB
1 /
CD4012B
3
CD4049UB
1 / 6 CD4049UB
V+
100k ?
100k ?
1 B
2 C
3 LT
CD4511B
V+ 16
f 15
g 14
1.8k ?
1.8k ?
1.2k ?
HP5082-7433
OR EQUIVALENT
V+
100k ?
100k ?
4 BL a 13
5 LE/STROBE b 12
6 D c 11
7 A d 10
8 GND e 9
1.8k ?
1.8k ?
1.8k ?
1.2k ?
12
11 10
f
a
9
g
8
b
7
c 3
V+
DP1
DP2
100
k ?
100
k ?
100
k ?
1 B
2 A
CA3162E
D 16
C 15
c 1
1
2
e
d
3
c 2
4
c
5
d P
6
3 NSD
V+ 14
V+
4 MSD
5 LSD
6 HOLD
7 GND
8 ZERO
GAIN 13
INT 12
HIGH 11
LOW 10
ZERO 9
V+
0.27 μ F
INPUT
10k ?
GAIN
6 BUFFERS
(1 CD4050B)
50k ?
FIGURE 4. TYPICAL COMMON-CATHODE LED APPLICATION
6
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