SP 100
CIRCUIT DIAGRAM
1
11
12
10
3? Digit LED Voltmeter Module
2
6
7
5
0V
3
4
8
9
PIN FUNCTIONS
1.
2.
V+
DE
Positive power supply to the meter.
Display Enable. Connect to V+ for normal operation.
PO Box 770, Londonderry, NH 03053 1-800-821-0023
Do not connect to enter low power mode. The display is then blanked, but the voltmeter section
continues to operate. In low power mode, the current consumption is reduced to 400 μ A (typ).
3. 0V 0V power supply connection to the meter.
4. DP3 Connect to 0V to display DP3 (199.9).
5. DP2 Connect to 0V to display DP2 (19.99).
6. DP1 Connect to 0V to display DP1 (1.999).
7. R I Reference voltage input for the meter's A/D converter.
8. RO Precision reference voltage output. Connect to RI for normal operation.
9. T Connect to V+ to test the display. All segments will be displayed, except for decimal points.
10. COM 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.
11. INH Positive measuring input.
12. INL Negative measuring input.
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).
www.lascarelectronics.com Page 3 of 4
www.martelcorp.com
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