DSD-40BCD Series
Miniature 4�½ Digit, BCD Input, Slave LED Display
Ordering Information
Display
Display Type and Size
Min.
Typ.
Max.
Units
DSD-40BCD - RS-C
LED Color: GS
= Standard Green
RL
= Low-Power Red
RS
= Standard Red
Accessories:
DMS-30-CP
DMS-BZL1-C
DMS-BZL2-C
4�½ Digit LED, 0.52"/13.2mm high
LED Peak Wavelength (λ):
DSD-40BCD-GS
DSD-40BCD-RL
DSD-40BCD-RS
Physical/Environmental
–
–
–
565
630
635
–
–
–
nm
nm
nm
Panel cutout punch
DSD-40 bezel assembly
DSD-40 bezel assembly with sealing gasket
Operating Temperature
Storage Temperature
Humidity (Non-condensing)
Case Material
Weight
BCD Inputs and Resultant Displays
0
–40
0
–
–
–
+70
+75
85
°C
°C
%
A panel-mount retaining clip is supplied with each model.
Polycarbonate
1 ounce (28 grams)
Functional Specifications
TA = +25°C and supply voltage = +5V, unless otherwise noted.
0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111
Control Inputs
BCD
(pins I-L)
and TEST
(pin 2)
Inputs:
Min.
Typ.
Max.
Units
TECHNICAL NOTES
–
–
+2.4
–
–
–
–
–
+0.8
0.4
–
0.05
Volts
mA
Volts
mA
Low-Level Input Voltage (V
IL
)
Low-Level Input Current (I
IL
)
High-Level Input Voltage (V
IH
)
High-Level Input Current (I
IH
)
Polarity Input
(pin F):
Low-Level Input Voltage (V
IL
)
Low-Level Input Current (I
IL
)
High-Level Input Voltage (V
IH
)
High-Level Input Current (I
IH
)
Digit Drive Inputs
(pins A-E):
–
–
+4.5
–
–
–
–
–
+0.8
0.4
–
0.05
Volts
mA
Volts
mA
1. DSD-40BCD Operation
(Please Refer to the Timing and Pinout Dia-
grams for the Following Discussion): The DSD-40BCD display has five
digits, labeled digit 1 (left-most digit or MSD) through digit 5 (right-
most 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 seven-segment
LED outputs necessary to display the numerals "0" through "9".
Since there are effectively five digits and only one set of BCD data in-
puts, 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 sec-
tion titled "Controlling the Display Brightness."
2. DSD-40BCD Timing Diagram
(See Figure 2): The timing diagram de-
picts 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. Any drive
Low-Level Input Voltage (V
IL
)
Low-Level Input Current (I
IL
)
High-Level Input Voltage (V
IH
)
High-Level Input Current (I
IH
)
DP1-DP4 Inputs
(pins 4-6, 8):
–
–
+4.5
–
–
–
–
–
+0.8
0.4
–
2
Volts
mA
Volts
mA
Low-Level Input Voltage (V
IL
)
Low-Level Input Current (I
IL
)
High-Level Input Voltage (V
IH
)
High-Level Input Current (I
IH
)
Power Supply Requirements
Supply Voltage
Supply Current:
DSD-40BCD-GS
DSD-40BCD-RL
DSD-40BCD-RS
–
–
+4.5
–
–
–
–
–
+0.8
20
–
0.05
Volts
mA
Volts
mA
+4.75
+5.00
+5.25
Volts
–
–
–
+100
+35
+85
+130
+45
+110
mA
mA
mA
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MPM_DSD-40BCD.B01
Page 2 of 5
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
