DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
These Nine-Digit Calculator Numeric Seven-Segment LED Displays are intended for use under pulsed conditions by enabling the common cathode of each digit sequentially and enabling the desired Segment and Decimal Point anodes in phase with the character enabling pulse. The pulse rate is kept high enough so that light from each character appears to the eye to be constant.
The DIS206A Nine-Digit display assembly manufactured by Bowmar uses Chip-on-Board (COB) technology with each character formed by bonding seven individual Segment LED chips and one Decimal Point LED chip directly to a printed circuit board (PCB) and protecting them with a one-piece flat protection lens.
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• 0.12”/3.0 mm Characters • Seven-Segment Digits with Right-Hand Decimals • Continuous Uniform Segments • Wide Viewing Angle • Common-Cathode Configuration for Multiplex Applications • 0.2”/5.08 mm Character Spacing • Integrated Red Plastic Lens |
| Type | Products | Digits | Comments |
| DIS206A |
TI-2550 Version 1, Display 3 TI-2550 Version 2 TI-2500-II |
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| Type | Products | Relationship | Comments |
| DIS134C | TI-2500 Version 3, TI-2550 Version 1 | Predecessor | Uses 9*DISXXX |
| R7H-122-9 | Relative | Bowmar COB Technology | |
| DIS206C | TI-2550 Version 1, Display 2 | Successor | Uses COB Technology with Magnifying Lens |
| Item | Min | Typ | Max | Unit | Comments |
| Display Width |
2.50 63.5 |
inch mm |
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| Display Height |
1.02 26.0 |
inch mm |
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| Display Depth |
0.10 2.6 |
inch mm |
Including Printed Circuit Board | ||
| PCB Thickness |
0.03 0.8 |
inch mm |
FR4 | ||
| Lens Width |
2.01 51.2 |
inch mm |
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| Lens Height |
0.54 13.7 |
inch mm |
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| Lens Depth |
0.07 1.8 |
inch mm |
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| Character Height |
0.120 3.00 |
inch mm |
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| Character Width |
0.085 2.20 |
inch mm |
w/o Decimal Point | ||
| Character Slant Angle |
10 | degrees | |||
| Character Spacing |
0.200 5.08 |
inch mm |
The displays are formed by bonding monolithic GaAsP (Gallium Arsenide Phosphide) LED chips integrating either one character with seven Segment Bars or one Decimal Point, each directly to a double-sided FR4 printed circuit board (PCB) and placing a one-piece red acrylic protecting lens on top of the assembly with four heat stakes.
The DIS206A uses a 2.50" / 63.5 mm by 1.02” / 26.0 mm rectangular printed circuit board (PCB) with 19 solder tabs with a 0.1” / 2.54 mm pitch arranged on the bottom of the display module.
| Pin | Pol. | Function |
| 1 | A | G Segments |
| 2 | 2 | Digit 9 (Minus Sign) |
| 3 | A | F Segments |
| 4 | C | Digit 8 (MSD) |
| 5 | A | E Segments |
| 6 | C | Digit 7 |
| 7 | n.c. | |
| 8 | C | Digit 6 |
| 9 | A | Decimal Points |
| 10 | C | Digit 5 |
| 11 | A | D Segments |
| 12 | C | Digit 4 |
| 13 | n.c. | |
| 14 | C | Digit 3 |
| 15 | A | A Segments |
| 16 | C | Digit 2 |
| 17 | A | C Segments |
| 18 | C | Digit 1 (LSD) |
| 19 | A | B Segments |
| The Anode of the Segments A-G, Segment G (H) for minus sign of the Exponent and Right-Hand Decimals and the Cathode of the Digits 1-9 are connected to the display in the pictured way. |
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Note: The DIS206A Display module has Segment B, Segment C and Decimal Point (Segment DP) LED chips of the leftmost digit not populated.
If you have additions to the above datasheet please email: joerg@datamath.org.
© Joerg Woerner, December 25, 2024. No reprints
without written permission.