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

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Fabricante

HDLO-2416

Four Character 5.0 mm (0.2 inch) Smart 5 x 7 Alphanumeric Displays

HP => Agilent Technologies 

7

Electrical Description

Pin Function

Description

Chip Enable

(CE1 and CE2,

pins 1 and 2)

CE1 and CE2 must be a logic 0 to write to the

display.

Clear

(CLR, pin 3)

When CLR is a logic 0 the ASCII RAM is reset

to 20hex (space) and the Control Register/

Attribute RAM is reset to 00hex.

Cursor Enable

(CUE pin 4)

CUE determines whether the IC displays the

ASCII or the Cursor memory. (1 = Cursor,

0 = ASCII).

Cursor Select

(CU, pin 5)

CU determines whether data is stored in the

ASCII RAM or the Attribute RAM/Control

Register. (1 = ASCII, 0 = Attribute

RAM/Control Register).

Write

(WR, pin 6)

WR must be a logic 0 to store data in the

display.

Address

Inputs

(A1 and A0,

pins 8 and 7)

A0-A1 selects a specific location in the display

memory. Address 00 accesses the far right

display location. Address 11 accesses the far

left location.

Data Inputs

(D0-D6,

pins 11-17)

VDD

(pin 9)

D0-D6 are used to specify the input data for the

display.

VDD is the positive power supply input.

GND

(pin 10)

GND is the display ground.

Blanking

Input

(BL, pin 18)

BL is used to flash the display, blank the

display or to dim the display.

Display Internal Block

Diagram

Figure 1 shows the HDLX-2416

display internal block diagram.

The CMOS IC consists of a 4 x 7

Character RAM, a 2 x 4 Attribute

RAM, a 5 bit Control Register, a

128 character ASCII decoder and

the refresh circuitry necessary to

synchronize the decoding and

driving of four 5 x 7 dot matrix

displays.

Four 7 bit ASCII words are stored

in the Character RAM. The IC

reads the ASCII data and decodes

it via the 128 character ASCII

decoder. The ASCII decoder

includes the 64 character set of

the HPDL-2416, 32 lower case

ASCII symbols, and 32 foreign

language symbols.

A 5 bit word is stored in the

Control Register. Three fields

within the Control Register

provide an 8 level brightness

control, master blank, and ex-

tended functions disable.

For each display digit location,

two bits are stored in the Attribute

RAM. One bit is used to enable a

cursor character at each digit

location. A second bit is used to

individually disable the blanking

features at each digit location.

The display is blanked and

dimmed through an internal

blanking input on the row drivers.

Logic within the IC allows the user

to dim the display either through

the BL input or through the

brightness control in the control

register. Similarly the display can

be blanked through the BL input,

the Master Blank in the Control

Register, or the Digit Blank

Disable in the Attribute RAM.

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