Datasheet

ManualsBrandsBROADCOM ManualsDisplaysDot matrix dislplay Red 4.57 mm No. of digits: 8

HDSP-253x Series

Eight Character 5 mm Smart Alphanumeric Display

Data Sheet

ESD WARNING: Normal CMOS handling precautions should be observed to avoid static discharge.

Device Selection Guide

AlGaAs Red HER Orange Yellow Green

HDSP-2534 HDSP-2532 HDSP-2530 HDSP-2531 HDSP-2533

Description

The HDSP-253x is ideal for applications where displaying

eight or more characters of dot matrix information in an

aesthetically pleasing manner is required. These devices

are eight-digit, 5 x 7 dot matrix, alphanumeric displays.

The 5.0 mm (0.2 inch) high characters are packaged in a

0.300 inch (7.62 mm) 30 pin DIP. The on-board CMOS IC

has the ability to decode 128 ASCII characters, which are

permanently stored in ROM. In addition, 16 programmable

symbols may be stored in on-board RAM. Seven brightness

levels provide versatility in adjusting the display intensity

and power consumption. The HDSP-253x is designed for

standard microprocessor interface techniques. The display

and special features are accessed through a bidirectional

eight-bit data bus.

Features

• XY stackable

• 128 character ASCII decoder

• Programmable functions

• 16 user denable characters

• Multi-level dimming and blanking

• TTL compatible CMOS IC

• Wave solderable

Applications

• Avionics

• Computer peripherals

• Industrial instrumentation

• Medical equipment

• Portable data entry devices

• Telecommunications

• Test equipment

Summary of content (15 pages)

PAGE 1
HDSP-253x Series Eight Character 5 mm Smart Alphanumeric Display Data Sheet Description Features The HDSP-253x is ideal for applications where displaying eight or more characters of dot matrix information in an aesthetically pleasing manner is required. These devices are eight-digit, 5 x 7 dot matrix, alphanumeric displays. The 5.0 mm (0.2 inch) high characters are packaged in a 0.300 inch (7.62 mm) 30 pin DIP.
PAGE 2
Package Dimensions 42.93 (1.690) MAX. PIN FUNCTION ASSIGNMENT TABLE PIN # FUNCTION PIN # FUNCTION 2.68 SYM. (0.105) 5.36 TYP. (0.211) 4.57 TYP. (0.180) 0 1 2 3 4 5 6 7 2.29 SYM. (0.090) PIN #1 IDENTIFIER 11.43 MAX. (0.450) 2.54 TYP. (0.100) DATE CODE (YEAR, WEEK) LUMINOUS INTENSITY CATEGORY COLOR BIN (3) PART NUMBER RST FL A0 A1 A2 A3 NO PIN NO PIN NO PIN A4 CLS CLK WR CE VDD 5.31 (0.209) 5.08 SYM. (0.
PAGE 3
ASCII Character Set D7 D6 BIT S D5 0 0 D4 D3 D2 D1 D0 ROW COLUMN 0000 0 0001 1 0010 2 0011 3 0100 4 0101 5 0110 6 0111 7 1000 8 1001 9 1010 A 1011 B 1100 C 1101 D 1110 E 1111 F 0 0 0 0 0 0 0 0 1 1 1 2 0 0 0 1 0 1 1 3 0 4 0 1 0 0 5 0 1 1 1 6 0 1 0 1 7 1 X 1 X X 8–F 16 U S E R D E F I N E D C H A R A C T E R S Optical Characteristics at 25°C[1] VDD = 5.
PAGE 4
Recommended Operating Conditions Parameter Symbol Minimum Nominal Maximum Units Supply Voltage VDD 4.5 5.0 5.5 V Electrical Characteristics over Operating Temperature Range 4.5 < VDD < 5.5 unless otherwise specified Parameter Symbol Min. Input Leakage (Input without Pull-up) II -1.0 Input Current (Input with Pull-up) IIP -30 IDD Blank IDD 8 Digits 12 Dots/Char[2,3,4] 25°C Typ.[1] 25°C Max.[1] Max. Units Test Conditions 1.
PAGE 5
AC Timing Characteristics over Temperature Range VDD = 4.5 to 5.5 V unless otherwise specified. Reference Number Symbol Description Min.
PAGE 6
Write Cycle Timing Diagram 1 A0 -A4 FL 4 2 2 3 5 CE 6 7 8 WR 10 9 D0 -D7 Input Pulse Levels: 0.6 V to 2.4 V Read Cycle Timing Diagram 1 A0 -A4 FL 4 2 CE 6 7 11 RD 12 D0 -D7 Input Pulse Levels: 0.6 V to 2.4 V Output Reference Levels: 0.6 V to 2.
PAGE 7
Electrical Description Pin Function Description RESET (RST, pin 1) Reset initializes the display. FLASH (FL, pin 2) FL low indicates an access to the Flash RAM and is unaffected by the state of address lines A3-A4. ADDRESS INPUTS (A0-A4, pins 3-6, 10) 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 (UserDefined Character) RAM.
PAGE 8
OCS A3 A4 FL CE FL CE A3 A4 FL CE CLR1 SELF TEST RESULT RESET CONTROL WORD REGISTER EN RD WR D0-D7 PRE SET CLR RD WR D0-D7 6 7 SELF TEST 0 INTENSITY 1 2 FLASH 3 BLINK 4 UDC ADDR UDC ADDR REGISTER EN Figure 1. HDSP-253X internal block diagram.
PAGE 9
Display Internal Block Diagram Figure 1 shows the internal block diagram of the HDSP253X display. The CMOS IC consists of an 8 byte Character RAM, an 8 bit Flash RAM, a 128 character ASCII decoder, a 16 character UDC RAM, a UDC Address Register, a Control Word Register and the refresh circuitry necessary to synchronize the decoding and driving of eight 5 x 7 dot matrix characters.
PAGE 10
UDC RAM and UDC Address Register Figure 3 shows the logic levels needed to access the UDC RAM and the UDC Address Register. The UDC Address Register is eight bits wide. The lower four bits (D0-D3) are used to select one of the 16 UDC locations. The upper four bits (D4-D7) are not used. Once the UDC address has been stored in the UDC Address Register, the UDC RAM can be accessed. To completely specify a 5 x 7 character requires eight write cycles.
PAGE 11
Control Word Register Figure 6 shows how to access the Control Word Register. This is an eight bit register which performs five functions. They are Brightness control, Flash RAM control, Blinking, Self Test and Clear. Each function is independent of the others. However, all bits are updated during each Control Word write cycle. Brightness (Bits 0-2) Bits 0-2 of the Control Word adjust the brightness of the display.
PAGE 12
Self Test Function (Bits 5, 6) Display Reset Bit 6 of the Control Word Register is used to initiate the self test function. Results of the internal self test are stored in bit 5 of the Control Word. Bit 5 is a read only bit where bit 5 = “1” indicates a passed self test and bit 5 = “0” indicates a failed self test. Figure 7 shows the logic levels needed to reset the display. The display should be reset on Power-up.
PAGE 13
Figure 8. Proper method to manually insert a display. Figure 9. Improper method to manually insert a display. Thermal Considerations The HDSP-253X can operate from -40°C to +85°C. The display’s low thermal resistance allows heat to flow from the CMOS IC to the 24 package pins. Typically, this heat is conducted through the printed circuit board traces to free air. For most applications, no additional heatsinking is needed.
PAGE 14
PD MAX. – MAXIMUM POWER DISSIPATION – W Table 3 shows the calculated maximum allowable ambient temperature for several different sets of operating conditions. The worst case alphanumeric characters (#,@,B) have 20 pixels. Displaying eight 20-pixel characters will not occur in normal operation. Thus, using eight 20-pixel characters to calculate power dissipation will over estimate the power and the IC junction temperature.
PAGE 15
Ground Connections Two ground pins are provided to keep the internal IC logic ground clean. The designer can, when necessary, route the analog ground for the LED drivers separately from the logic ground until an appropriate ground plane is available. On long interconnections between the display and the host system, the designer can keep voltage drops on the analog ground from affecting the display logic levels by isolating the two grounds.