DPM3AS-BL Martel Electronics, DPM3AS-BL Datasheet - Page 3

• Manufacturer Part Number: DPM3AS-BL
• Description: LCD 11MM UNIV MINI METER BK LIT
• Manufacturer: Martel Electronics
• Series: 10r
• Type: Voltmeterr

Specifications of DPM3AS-BL

• Measuring Range: 0 ~ 200mVDC
• Display Style: Black Characters, Green Background
• Display Type: LCD
• Display Face Size: 1.48" L x 0.53" W (37.5 x 13.5mm)
• Display Digits: 3.5
• Display Digits - Height: 0.433" (11.00mm)
• Backlight: Green
• Mounting Type: Panel Mount
• Termination: PC Pins
• Voltage - Supply: 3 ~ 7.5VDC, 6 ~ 15VDC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 227-1049

DPM 3AS-BL
PIN FUNCTIONS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
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:
LREF
BAT
DP1
DP2
DP3
CIRCUIT DIAGRAM
REF LO
REF HI
COM
INLO
GND
V-
INLO
INHI
COM
REF LO
REF HI
GND
V+
TEST
INHI
XDP
BAT
L-
L+
V+
L+
V-
L-
8
3
2
5
7
1
13
12
4
6
Normally Open. Disables the Low Battery warning annunciator. Cut this link and add a low battery detection circuit
Normally Closed. Enables the internal voltage reference circuit. Cut this link when using an external voltage reference.
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.
R10
100k
C6
1u5
R9
3k
Negative power supply to the meter (6.0 to 15.0V meter power supply applications only).
Low Battery annunciator drive pin. See application on the right.
Negative measuring input.
Positive measuring input.
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 A) by, 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
power external logic up to a maximum of 1mA.
Inversion of LCD drive voltage.
This pin is not fitted as standard.
Negative power supply to LED backlighting.
Positive power supply to LED backlighting.
The backlighting is internally configured for 5V operation.
If a higher voltage is used, then add a series current limiting resistor Rs.
See Applications for calculations of Rs.
R3
1.5k
R11
22R
LREF
C7
1u5
LED2
47pF
C5
100nF
220nF
180k
47nF
R4
C4
C1
C2
180k
R1
LED1
27
28
29
31
30
32
34
33
36
35
38
39
40
PO Box 770, Londonderry, NH 03053 1-800-821-0023
www.martelcorp.com
INT
BUF
A/Z
IN HI
IN LO
COM
CREF+
CREF-
REF HI
REF LO
OSC3
OSC2
OSC1
www.lascarelectronics.com
IC1
V+
V- TEST
26
1
POL
m
37
b1
d1
b2
d2
b3
d3
ab
BP
a1
c1
e1
g1
a2
c2
e2
g2
a3
c3
e3
g3
f1
f2
f3
5
4
3
2
8
6
7
12
11
10
9
14
13
25
23
16
24
15
18
17
22
19
20
21
R2
1M
Q1
BCX19
V+
a1
b1
c1
d1
e1
f1
g1
a2
b2
c2
d2
e2
f2
g2
a3
b3
c3
d3
e3
f3
g3
ab
POL
COM
3‰ Digit Backlit LCD Voltmeter Module
R5
100k
LCD1
LOBAT
DP1
DP2
DP3
BAT
199.9
19.99
1.999
470k
1M
R8
1M
SET
THRESHOLD
1M
R7
1M
Check Link BAT is OPEN.
BC 237
4077
R6
1M
DP1
DP2
DP3
10
11
9
XDP
BAT
TEST
11
10
9
V+
V-
8
1
BAT
XDP
TEST
V+