HDSP-2179 查看數據表（PDF） - HP => Agilent Technologies

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HDSP-2179

Eight Character 5.0 mm (0.2 inch) Glass/Ceramic Intelligent 5 x 7 Alphanumeric Displays for Military Applications

HP => Agilent Technologies 

9

Electrical Description

Pin Function

RESET (RST, pin 5)

Reset initializes the display.

FLASH (FL, pin 27)

ADDRESS INPUTS

(A0-A4, pins 28-32)

FL low indicates an access to the Flash RAM and is unaffected by the

state of address lines A3-A4.

Each location in memory has a distinct address. Address inputs (A0-A2)

select a specific location in the Character RAM, the Flash RAM or a

particular row in the UDC (User-Defined Character) RAM. A3-A4 are

used to select which section of memory is accessed. Table 1 shows the

logic levels needed to access each section of memory.

Table 1. Logic Levels to Access Memory

FL A4 A3

0XX

Section of Memory

Flash RAM

A2 A1 A0

Character Address

1

0

0

UDC Address Register

Don't Care

1

0

1

UDC RAM

Row Address

1

1

0

Control Word Register

Don't Care

1

1

1

Character RAM

Character Address

CLOCK SELECT

(CLS, pin 1)

CLOCK INPUT/OUTPUT

(CLK, pin 2)

WRITE (WR, pin 3)

CHIP ENABLE (CE, pin 4)

READ (RD, pin 6)

DATA Bus (D0-D7,

pins 11-14, 19-22)

GND(SUPPLY) (pin 17)

GND(LOGIC) (pin 18)

VDD(POWER) (pin 16)

This input is used to select either an internal (CLS = 1) or external (CLS = 0)

clock source.

Outputs the master clock (CLS = 1) or inputs a clock (CLS = 0) for slave

displays.

Data is written into the display when the WR input is low and the

CE input is low.

This input must be at a logic low to read or write data to the display and

must go high between each read and write cycle.

Data is read from the display when the RD input is low and the CE

input is low.

The Data bus is used to read from or write to the display.

This is the analog ground for the LED drivers.

This is the digital ground for internal logic.

This is the positive power supply input.

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