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DPM 3AS-BL
CIRCUIT DIAGRAM
3‰ Digit Backlit LCD Voltmeter Module
V+
8
R10
100k
LREF
1
a1
IC1
INHI
INLO
COM
REF HI
REF LO
GND
3
2
4
6
5
7
R9
3k
C6
1u5
R3
1.5k
C7
1u5
C1
47nF
C2
220nF
C4
100nF
C5 R4
47pF 180k
27
28
R1 29
180k
31
30
32
34
33
36
35
38
39
40
INT
BUF
A/Z
IN HI
IN LO
COM
CREF+
CREF-
REF HI
REF LO
OSC3
OSC2
OSC1
V+
b1
c1
d1
e1
f1
g1
a2
b2
c2
d2
e2
f2
g2
a3
b3
c3
d3
e3
f3
g3
ab
POL
BP
V- TEST
5
4
3
2
8
6
7
12
11
10
9
14
13
25
23
16
24
15
18
17
22
19
20
21
a1
b1
c1
d1
e1
f1
g1
a2
b2
c2
d2
e2
f2
g2
a3
b3
c3
d3
e3
f3
g3
ab
POL
COM
LCD1
DP1
DP2
DP3
LOBAT
199.9
19.99
1.999
R8
1M
R7
1M
DP1
DP2
DP3
R6
1M
V-
L+
1
13
R11
22R
26
37
R2
1M
V+
R5
100k
BAT
11
BAT
Q1
L-
12
LED2
LED1
BCX19
10
9
XDP
TEST
PIN FUNCTIONS
1.
2.
3.
4.
5.
6.
7.
8.
9.
V-
INLO
INHI
COM
REF LO
REF HI
GND
V+
TEST
Negative power supply to the meter (6.0 to 15.0V meter power supply applications only).
Negative measuring input.
Positive measuring input.
A)by,
Ground for the analogue section of the A/D converter. It is actively held at 3.05V (nom.) below V+ and must not be
allowed to sink excessive current (>100 m for instance, connecting to a higher voltage.
Negative input for reference voltage.
Positive input for reference voltage.
0V power supply to the meter (3.0 to 7.5V meter power supply applications only).
Positive power supply to the meter.
Connect to V+ to test the LCD. Do not connect to V+ for more than a few seconds as this may damage the LCD.
TEST is held actively at 5V (nom.) below V+ and is the ground for the digital section of the meter. It can be used to
10.
11.
XDP
BAT
power external logic up to a maximum of 1mA.
Inversion of LCD drive voltage.
Low Battery annunciator drive pin. See application on the right.
1M
1M
4077
10
XDP
8
V+
V+
This pin is not fitted as standard.
11
BAT
12.
L-
Negative power supply to LED backlighting.
13.
L+
Positive power supply to LED backlighting.
9
TEST
The backlighting is internally configured for 5V operation.
BC 237
If a higher voltage is used, then add a series current limiting resistor Rs.
See Applications for calculations of Rs.
470k
SET
THRESHOLD
V-
1
Note:
Check Link BAT is OPEN.
A negative supply is generated internally and mirrors the positive supply. For example: if V+ is +5V, then the internally generated V-
is -5V. When measuring with the input referenced to the same supply rail as that of the panel meter, then the limitations on the input
range are (V- + 1.5V) to (V+ - 1.5V).
Solder Links:
www.martelcorp.com
LREF
BAT
DP1
DP2
DP3
Normally Closed. Enables the internal voltage reference circuit. Cut this link when using an external voltage reference.
Normally Open. Disables the Low Battery warning annunciator. Cut this link and add a low battery detection circuit
to enable the Low Battery warning annunciator via Pin 11 (BAT).
Normally Open. Close this solder link to enable decimal point DP1.
Normally Open. Close this solder link to enable decimal point DP2.
Normally Open. Close this solder link to enable decimal point DP3.
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.lascarelectronics.com
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