DMS-40BCD-GS View Datasheet(PDF) - DATEL Data Acquisition products

Part Name

Description

Manufacturer

DMS-40BCD-GS

Miniature 4½ Digit, BCD Input Slave LED Display

DATEL Data Acquisition products

DMS-40BCD-GS Datasheet PDF : 4 Pages

1 2 3 4

DSD-40BCD

4½ D I G I T, S L AV E L E D D I S P L AY

Functional Specifications

TA = +25°C and supply voltage = +5V, unless otherwise noted.

Control Inputs

BCD (pins I-L) and TEST (pin 2) Inputs:

Low-Level Input Voltage (VIL)

Low-Level Input Current (IIL)

High-Level Input Voltage (VIH)

High-Level Input Current (IIH)

Polarity Input (pin F):

Low-Level Input Voltage (VIL)

Low-Level Input Current (IIL)

High-Level Input Voltage (VIH)

High-Level Input Current (IIH)

Digit Drive Inputs (pins A-E):

Low-Level Input Voltage (VIL)

Low-Level Input Current (IIL)

High-Level Input Voltage (VIH)

High-Level Input Current (IIH)

DP1-DP4 Inputs (pins 4-6, 8):

Low-Level Input Voltage (VIL)

Low-Level Input Current (IIL)

High-Level Input Voltage (VIH)

High-Level Input Current (IIH)

Power Supply Requirements

Supply Voltage

Supply Current:

DSD-40BCD-GS

DSD-40BCD-RL

DSD-40BCD-RS

Display

Display Type and Size

Min.

+2.4

+4.5

Typ.

Max. Units

+0.8 Volts

0.4

Volts

0.05

+0.8 Volts

0.4

Volts

0.05

+0.8 Volts

0.4

Volts

+0.8 Volts

Volts

0.05

+4.75 +5.00 +5.25 Volts

+100 +130

+35

+45

+85

+110

4½ Digit LED, 0.52"/13.2mm high

LED Peak Wavelength (λ):

DSD-40BCD-GS

DSD-40BCD-RL

DSD-40BCD-RS

565

660

635

Physical/Environmental

Operating Temperature

+70

°C

Storage Temperature

–40

+75

°C

Humidity (Non-condensing)

Case Material

Polycarbonate

Weight

1 ounce (28 grams)

BCD Inputs and Resultant Displays

0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111

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Ordering Information

DSD-40BCD - R S

Accessories:

DMS-30-CP

DMS-BZL1

DMS-BZL2

LED Color: GS = Standard Green

RL = Low-Power Red

RS = Standard Red

Panel cutout punch

DSD-40 bezel assembly

DSD-40 bezel assembly with sealing gasket

A panel-mount retaining clip is supplied with each model.

Technical 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 (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

inputs, the DSD-40BCD's digits have their segments tied ("multi-

plexed") 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. Any 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 levels.

Unused decimal points may be left open. The specified minimum

VIH applies only if logic-level devices are used to select the

decimal points.

4. POLARITY (Pin F): The function of this active-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

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