DATEL DMS-40BCD-RS, DMS-40BCD-RL, DMS-40BCD-GS Datasheet
DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • Email: sales@datel.com • Internet: www.datel.com
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Low cost! Complete!
No external components required
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Rugged, epoxy-encapsulated package
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Ideal for computer-based instruments
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Miniature size:
2.17" x 0.92" x 0.56"
55mm x 23mm x 14mm
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Built-in color filter and bezel
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Single +5V supply, TTL compatible
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Low-power model, 35mA (175mW)
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Large (0.52"/13.2mm), matchedintensity, LED display
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Choice of red or green LED's
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Minus sign and decimal points included
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PC-board or panel mountable
Features
Figure 1. DSD-40BCD Series Simplified Schematic
Miniature
4½ Digit, BCD Input
Slave LED Display
DSD-40BCD Series
DATEL's new DSD-40BCD digit al slave display combines a full-size, 4½ digit,
LED display with all the other necessary components (including a built-in, contrastenhancing filter/bezel) to implement a pc-board mountable instrument display . The
epoxy-encapsulated, 24-pin package, measuring only 2.17 x 0.92 x 0.56 inches, is
perfectly sized to occupy the absolute minimum pc-board space. The one-piece LED
display eliminates the need to purchase multiple, matched-intensity LED's — usually
an expensive and limited-availability situation.
The DSD-40BCD's flexible design gives the user full control of all major display
functions including display update rate, number of digits enabled, and decimal point
selection. Its TTL-compatible inputs interface directly with most BCD output, integrating analog-to-digital converters — no additional glue logic is required! When used
with sophisticated microcomputers, the brightness of any digit can be independently
controlled by simply lowering the digit-drive input duty cycle.
The extremely rugged package allows all models to operate over the temperature
range of 0 to +70°C (at 0 to 95% relative humidity). For power-sensitive designs, the
low-power DSD-40BCD-RL model, with all digits turned on, draws only 35mA from its
+5V supply. This ultra-low power consumption means that even battery-powered
applications can now benefit from the superior readability offered by LED displays.
B2
B4
B1
N.C.
N.C.
DIGIT
DRIVE 5
F
E
D
I
K
L
J
H
G
A
C
B
B8
SEVEN-SEGMENT DRIVERS
DISPLAY TEST
ABCDEFG
+5V
POL
+5V SUPPLY
DP 1
DP 2
DP 3
6
5
4
1
3
2
5V RETURN
DISPLAY TEST
DIGIT
DRIVE 1
DIGIT
DRIVE 2
DIGIT
DRIVE 3
DIGIT
DRIVE 4
DIGIT
DRIVE 4
DIGIT
DRIVE 1
N.C.
N.C.
5V RETURN
DP 4
N.C.
9
11
12
10
8
7
N.C.
DIG 5DIG 4DIG 3DIG 2DIG 1
POLARITY
DP
BCD DECODER
DP1
DP2 DP3 DP4
DP 1
DP 4
A
B
C
D
E
F
G
Segment
Identification
®®
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DSD-40BCD
4½ DIGIT, SLAVE LED DISPLAY
Control Inputs Min. Typ. Max. Units
BCD (pins I-L) and TEST (pin 2) Inputs:
Low-Level Input Voltage (VIL) -- -- +0.8 Volts
Low-Level Input Current (IIL) -- -- 0.4 mA
High-Level Input Voltage (V
IH) +2.4 -- -- Volts
High-Level Input Current (IIH) -- -- 0.05 mA
Polarity Input (pin F):
Low-Level Input Voltage (V
IL) -- -- +0.8 Volts
Low-Level Input Current (I
IL) -- -- 0.4 mA
High-Level Input Voltage (VIH) +4.5 -- -- Volts
High-Level Input Current (IIH) -- -- 0.05 mA
Digit Drive Inputs (pins A-E):
Low-Level Input Voltage (VIL) -- -- +0.8 Volts
Low-Level Input Current (IIL) -- -- 0.4 mA
High-Level Input Voltage (VIH) +4.5 -- -- Volts
High-Level Input Current (IIH)----2mA
DP1-DP4 Inputs (pins 4-6, 8):
Low-Level Input Voltage (VIL) -- -- +0.8 Volts
Low-Level Input Current (IIL)----20mA
High-Level Input Voltage (VIH) +4.5 -- -- Volts
High-Level Input Current (IIH) -- -- 0.05 mA
Power Supply Requirements
Supply Voltage +4.75 +5.00 +5.25 Volts
Supply Current:
DSD-40BCD-GS -- +100 +130 mA
DSD-40BCD-RL -- +35 +45 mA
DSD-40BCD-RS -- +85 +110 mA
Display
Display Type and Size 4½ Digit LED, 0.52"/13.2mm high
LED Peak Wavelength (
λλ
λλ
λ
):
DSD-40BCD-GS -- 565 -- nm
DSD-40BCD-RL -- 660 -- nm
DSD-40BCD-RS -- 635 -- nm
Physical/Environmental
Operating Temperature 0 -- +70 °C
Storage Temperature –40 -- +75 °C
Humidity (Non-condensing) 0 -- 95 %
Case Material Polycarbonate
Weight 1 ounce (28 grams)
BCD Inputs and Resultant Displays
Functional Specifications
TA = +25°C and supply voltage = +5V, unless otherwise noted.
T echnical Notes
1. DSD-40BCD Operation (Please Refer to the Timing and Pinout
Diagrams for the Following Discussion): The DSD-40BCD display has
five digits, labeled digit 1 (left-most digit or MSD) through digit 5 (rightmost digit or LSD), which are turned on by bringing their respective
DIGIT DRIVE inputs to a high logic level. The binary coded decimal
data (BCD) on pins I-L is decoded into the corresponding sevensegment LED outputs necessary to display the numerals
"0" through "9".
Since there are effectively five digits and only one set of BCD data
inputs, the DSD-40BCD's digits have their segments tied ("multiplexed") together. The top segment, referred to as segment A, of digit
5 is connected to the A segment of the other three digits (digit 1 has
no A segment). The remaining B, C, D, E, F and G segments are
connected to each other in the same fashion.
As an example of how the multiplexing scheme works, assume that
the BCD data inputs are 0001 (the BCD code for the decimal number
1) and also assume that the DIGIT DRIVE 3 input is high. Under these
conditions, the B and C segments of digits 1-5 will all be enabled.
However, only the digits whose DIGIT DRIVE inputs are high, in this
case only digit 3, will display the numeral "1". All the other digits will be
off. This example, while technically valid, will produce an extremely
bright "1" for digit 3. This will be explained in greater detail in the
section titled "Controlling the Display Brightness."
2. DSD-40BCD Timing Diagram (See Figure 2): The timing diagram
depicts the required typical input conditions and timing relationships
that allow the user to access all 5 digits. The recommended display
scan rate is 100Hz. All 5 digits are scanned in 10ms, and each
individual digit is "on" for 2ms (20% duty cycle). The 100Hz figure is
not critical; it can go as low as 70Hz without any impact on
display visibility.
The timing diagram shows the digits being scanned from left to right
(DIGIT 1 to DIGIT 5), but this order is not mandatory. An y drive
sequence can be used, as long as BCD data is presented at the
correct corresponding DIGIT DRIVE interval. An important point to
keep in mind is that the DSD-40BCD has no internal data latches!
The DIGIT DRIVE and BCD data inputs must be continuously strobed
to keep the display properly illuminated.
3. Decimal Point Inputs (DP1-DP4, Pins 4-6, 8): The four, active-low,
decimal point segments are multiplexed in a similar, though not
identical, manner as the rest of the digit segments. The four decimal
points are controlled by their respective DIGIT DRIVE inputs. A
selected decimal point may be permanently connected to ground. It
will only be illuminated when its respective DIGIT DRIVE input is high.
For example, if pin 6 (DP1) is hard-wired to pin 3 (5V RETURN), DP1
will only be on during the time interval that DIGIT DRIVE 1 is high.
As the specifications table clearly states, DP1-DP4 each require
20mA of sink current in order to achieve good illumination le vels.
Unused decimal points may be left open. The specified minimum
V
IH applies only if logic-level devices are used to select the
decimal points.
4. POLARITY (Pin F): The function of this activ e-low pin is to turn on
the minus sign if negative readings are desired. The polarity input, like
the decimal points, can also be permanently connected to ground.
However, POLARITY is logic-level compatible and does not require
DSD-40BCD- RS
LED Color: GS = Standard Green
RL = Low-Power Red
RS = Standard Red
Accessories:
DMS-30-CP Panel cutout punch
DMS-BZL1 DSD-40 bezel assembly
DMS-BZL2 DSD-40 bezel assembly with sealing gasket
Ordering Information
A panel-mount retaining clip is supplied with each model.
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
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