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V 600
CIRCUIT DIAGRAM
3? Digit LCD Voltmeter Module
R2
a1
IC1
29
IC2B
4
IC2A
8
IC2D
IC2C
4070
VDD
INHI
INLO
COM
RFH
RFL
ROH
15
13
12
8
9
10
VDD
6
R1
300k
1M
C3
100nF
R6
100k
C1
68nF
C2
220nF
C4
100nF
R3 100k
C5
100pF
27
28
29
31
30
32
34
33
36
35
40
39
38
INT
BUF
A/Z
IN HI
IN LO
COM
CREF+
CREF-
REF HI
REF LO
OSC1
OSC2
OSC3
1
V+
b1
c1
d1
e1
f1
g1
a2
b2
c2
d2
e2
f2
g2
a3
b3
c3
d3
e3
f3
g3
bc4
POL
V- TEST BP
26 37
5
4
3
2
8
6
7
12
11
10
9
14
13
25
23
16
24
15
18
17
22
19
20
21
17
16
15
14
13
18
19
21
20
11
10
9
22
23
25
24
7
6
5
26
27
3
28
2
1
30
a1
b1
c1
d1
e1
f1
g1
a2
b2
c2
d2
e2
f2
g2
a3
b3
c3
d3
e3
f3
g3
b4
c4
POL
COM
COM
LCD1
LOBAT
1.999 4
DP1
19.99 3
DP2
199.9 11
DP3 12
IC2
VDD
10
14
7
5
6
2
1
12
13
9
8
BAT
BP
R9
1M
R8
1M
2
1
3
4
5
R7
1M
LO BAT
BP
DP1
DP2
DP3
ROL
VSS
7
11
R5
3k
R4
1.5k
14
TEST
See application diagram on next page.
PIN FUNCTIONS
1. BP Backplane connection from voltmeter IC.
2. LO BAT LCD connection to "Low Battery" annunciator.
3. DP1 Connect to V+ to display Decimal Point 1 (1.999).
4. DP2 Connect to VDD to display Decimal Point 2 (19.99).
5. DP3 Connect to VDD to display Decimal Point 3 (199.9).
6. ROH Positive output from internal reference.
7. ROL Negative output from internal reference.
8. COM The ground for the analogue section of the A/D converter, held actively at 2.8V (nom) below VDD.
COM must not be allowed to sink excessive current (> 100 μ A) by connecting it directly to a higher voltage.
9. RFH Positive input for reference voltage.
10. RFL Negative input for reference voltage.
11. VSS Negative power supply connection.
12. INLO Negative measuring input with reference to IN HI. Analogue inputs must be no closer than 1V
13. INHI Positive measuring input with reference to IN LO. to either the positive or negative supply.
14. TEST Connecting this pin to VDD to turn on display segments "-1888".
It should not be operated for more than a few seconds as the DC voltage applied to the LCD may "burn" the display.
This pin is nominally at 5V below VDD and is the ground for the digital section of the meter, it can be used as a negative
supply to power external logic up to a maximum of 1mA.
15. VDD Positive power supply connection.
Solder Links:
BP Normally Open.
BAT Normally Open.
www.martelmeters.com
page 3 of 4
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