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DPM 750S-BL
3? Digit Backlit LCD Voltmeter Module
CIRCUIT DIAGRAM
1
XDP
4
5
10
LCOM
2
LCD 600
BC847
BC847
V+
33
3
XDP
9
6
7
8
PIN FUNCTIONS
BC847
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
V+
GND
BL-
INHI
INLO
DP1
DP2
DP3
V-
COM
Positive power supply to the meter and LED backlighting.
0V power supply to the meter.
Negative power supply connection to the LED backlighting.
Positive measuring input.
Negative measuring input.
Connect to V+ to display DP1 (199.9).
Connect to V+ to display DP2 (19.99).
Connect to V+ to display DP3 (1.999).
Negative power supply to the meter.
Ground for analogue section of A/D converter.
It is actively held at 3.05V (nom.) below V+ and must not be allowed to sink excessive
current (>100 μ A) by, for instance, connecting to a higher voltage.
Note:
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
PO Box 770, Londonderry, NH 03053 1-800-821-0023
LCOM
La
Normally Open. When soldered, connects COM to INLO.
Normally Closed. Short circuits the scaling resistor Ra.
www.lascarelectronics.com Page 3 of 4
www.martelcorp.com page 3 of 4
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