HPDL-2416 Ver la hoja de datos (PDF) - HP => Agilent Technologies

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HPDL-2416

Four Character Smart Alphanumeric Displays

HP => Agilent Technologies 

Electrical Description

Display Internal Block

Diagram HPDL-1414

Figure 1 shows the internal block

diagram of the HPDL-1414. It

consists of two parts: the display

LEDs and the CMOS IC. The

CMOS IC consists of a four-word

ASCII memory, a 64-word charac-

ter generator, 17 segment drivers,

four digit drivers, and the

scanning circuitry necessary to

multiplex the four monolithic

LED characters. In normal

operation, the divide-by-four

counter sequentially accesses

each of the four RAM locations

and simultaneously enables the

appropriate display digit driver.

The output of the RAM is decoded

by the character generator which,

in turn, enables the appropriate

display segment drivers. Seven-

bit ASCII data is stored in RAM.

Since the display uses a 64-

character decoder, half of the

possible 128 input combinations

are invalid. For each display

location where D5 = D6 in the

ASCII RAM, the display character

is blanked.

Data Entry HPDL-1414

Figure 2 shows a truth table for

the HPDL-1414. Data is loaded

into the display through the

DATA inputs (D6-D0), ADDRESS

inputs (A1-A0), and WRITE (WR).

After a character has been

written to memory, the IC

decodes the ASCII data, drives

the display and refreshes it

without any external hardware or

software.

Figure 1. HPDL-1414 Internal Block Diagram.

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