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OEM335A Datasheet Preview

OEM335A Datasheet

3.5 digit LED voltmeter module

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OEM335A pdf
digital panel modules
user guide
OEM335A 3.5 digit LED voltmeter module
features
Bright, red LED display
Single 5V DC operation.
10.16mm digit height
Decimal point selectable
Self mountable.
Single ended or differential input.
DESCRIPTION
The OEM335A is a complete digital voltmeter module in a
very compact package incorporating a dual-slope
analogue to digital converter, a 100mV reference with
200mV full scale input sensitivity.
The large sized LED makes the module easily readable
from distance away. Auto-zeroing is provided by the
circuit itself, so no zero adjustment is required. The
module also has input polarity and over-range indication.
ELECTRICAL CHARACTERISTICS TA=25OC¡
CHARACTERISTIC
MIN TYP MAX
UNIT
Power supply Voltage
4.75 5 5.25
V
Power Supply Current
180 mA
Sampling Rate
2.5 Reading/sec.
Accuracy
0.1 ±1
% ± digits
Input Impedance
100
M
Input leakage Current
1 10
PA
Temperature Coefficient
100
PPM/oC
DIMENSIONS
mm
PIN FUNCTIONS
PIN SYMBOL
DESCRIPTION
1 V+ +5V Power supply.
2 GND Ground (0V for power supply).
3 IN HI Signal input terminals. If potential on INHI is
4 IN LO lower than INLO, display will show negative.
5 DP1 Decimal point select. The decimal point will be
6 DP2 shown if connected to DP.com and will be off if kept
7 DP3 floating.
8 DP.com Decimal point return
PANEL CUT OUT
OPERATING SPECIFICATION
Operating voltage
5V DC + 5%
Operating temperature
0 to 50OC
Storage temperature
-10 to 70OC
Relative humidity
80%
MODULE VIEW FROM REAR
Downloaded from Elcodis.com electronic components distributor
ORDERING INFORMATION
OEM335A 3.5 Digit, 200mV LCD voltmeter module
LM201
Connector and cable
OEM335AV4 Revision 4 - 21/10/03



anders
anders

OEM335A Datasheet Preview

OEM335A Datasheet

3.5 digit LED voltmeter module

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OEM335A pdf
USER INSTRUCTIONS
The OEM335A is designed for +5V single rail supply.
Incorrect supply will damage the module.
Apply the input signal between pin 3 (INHI) and pin 4
(INLO). The input range is 0 - 199.9mV.
Over range is indicated by illuminating a "1" in the most
significant digit and blanking the other digits.
It is recommended to use this module with floating inputs
i.e. the low input signal (INLO) must be isolated from the
power supply ground (GND). Where (INLO) must be
referenced to the power supply, connect via a 10K
resistor and a 0.1µF capacitor as shown opposite.
To activate a decimal point, connect the appropriate
decimal point pin to DPcom.
CONNECTION DIAGRAM
BASIC CONFIGURATION
APPLICATION CIRCUITS
DC VOLTAGE MEASUREMENT
To measure voltages greater than 200mV
an attenuator is required.
VIN=VD
x
R1+R2
R2
VD max. is 199.99mV
EXAMPLES
VIN Display
VD
2V 1.999V 199.9mV
10V 1500rpm 150mV
R1
1M
1M
R2
110K
15K
The input impedance becomes R1+R2. Choose accurate stable
resistors. Typically, R1=1MΩ. 9Mis a practical upper limit.
MULTI-RANGE DC VOLTAGE MEASUREMENT
For multi-range, use, a 2 pole,
4 way rotary switch. 1 pole for
range select and the other to
connect the appropriate
decimal point to V+
DC CURRENT MEASUREMENT
Shunt resistance
RS =
Vs
IIN
It is important to note the power
dissipation in the shunt and choose
resistor rating accordingly
PS =
Vs 2
IIN
=
IIN2 RS
EXAMPLES
Current
RS
PS
200mA 10.04W
2A 0.10.4W
DC MULTI-RANGE CURRENT MEASUREMENT
For multi-range, use, a 2 pole,
5 way rotary switch. 1 pole for
range select and the other to
connect the appropriate
decimal point to V+
AC VOLTAGE MEASUREMENT
The meter can only measure DC. Use the above circuit to convert AC to
DC. For voltages above 200mV AC, a potential divider is required before
the converter circuit as shown in the "Voltage measurement" section
above
OEM335AV4 Revision 4 - 21/10/03
anders electronics plc Bayham Place, London NW1 OEU UK
Tel: +44 (0)20 7380 8167 Fax: +44 (0)20 7874 1908 www.anders.co.uk
Downloaded from Elcodis.com electronic components distributor


Part Number OEM335A
Description 3.5 digit LED voltmeter module
Maker anders
Total Page 2 Pages
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