2.3 2 Digit 7-Segment Red Display Board€¦ · input interface and J2 data output interface. An...

2.3" 2 Digit 7-Segment Red Display Board User’s Guide

© 2004-2010 Sure Electronics Inc. DE-DP22811_Ver1.0

2.3" 2 DIGIT 7-SEGMENT RED DISPLAY BOARD

USER’S GUIDE

© 2004-2010 Sure Electronics Inc. DE-DP22811_Ver1.0_Page i

Table of Contents Chapter 1. Overview ..........................................................................................................1

1.1 Overview .............................................................................................................. 1 1.2 Quick Start ........................................................................................................... 2

Chapter 2. Hardware Detail ...............................................................................................3 2.1 7-segment LED .................................................................................................... 3 2.2 Shift Register Data Driver ................................................................................... 4 2.3 Data Ports Definition ........................................................................................... 4 2.4 Auxiliary Power Interface ................................................................................... 5 2.5 Data Buffer ........................................................................................................... 5 2.6 Connection in Series .......................................................................................... 6

Chapter 3. Electrical Characteristics ...............................................................................7 Chapter 4. Sample Codes..................................................................................................8

4.1 LED Segment Drive Demo Board’s Schematic................................................. 8 4.2 How to Connect Load ......................................................................................... 8 4.3 How to Display Data with PIC16F54 and PICC9.60 Environment ................... 9

Chapter 5. Mechanical Drawing......................................................................................11 Chapter 6. Contact Us .....................................................................................................12

2.3" 2 Digit 7-Segment Red Display Board

© 2004-2010 Sure Electronics Inc DE-DP22811_Ver1.0_Page ii

NOTES: Product Version ： Ver 1.0 Document Version ： Ver 1.0


USER’S GUIDE

© 2004-2010 Sure Electronics Inc.

Chapter 1. Overview 1.1 Overview

Thanks for using 7-segment information board series by Sure Electronics. This series includes 5 different size panels, they are 1.5inches, 1.8inches, 2.3inches, and 4inches, 7inches (character height). All those panels are driven by SPI like interface and all work in full static mode. They are easy to be interfaced to any Microcontroller. They could be widely used in panel meters, big clocks and any other information display usage. Sure Electronics providing series of such information boards is to reduce your development time and make them standard. In this series, most boards are 4 digits and static, if customer need any special digits and special size ones, could contact us with the contact information at the end of this document. This document is used to describe how to use 2.3 inches character height panels. FIGURE 1-1 OVERVIEW

FIGURE 1-2 ACCESSORY

Note: All the diagrams in this manual are for reference only.

DE-DP22811_Ver1.0_Page 1


1.2 Quick Start Please connect the info boards and the driver board as follows. FIGURE 1-3 CONNECTION SCHEMATIC

Note: 1. Pay attention to the connection of Input and Output. 2. Connect the info boards and the demo board before power on.

© 2004-2010 Sure Electronics Inc DE-DP22811_Ver1.0_Page 2


USER’S GUIDE


Chapter 2. Hardware Detail 2.1 7-segment LED

2.3’’ 2 digits 7-segment LEDs are installed on the board. All the segments are common- anode. The four digits are respectively marked as U3, U4 on the schematics. LEDs are driven by DIMM_NOT signal from DIMM_IN pin via 74HC00 NAND. Of course you can also drive the LED and adjust the brightness by applying PWM signal on the DIMM_IN pin. When the valid data is shifted from 74HC164 and DIMM_NOT signal is set to high (DIMM_IN signal low), all the corresponding segments will be illuminated. Before change the data displayed by segments, turn off the display first and then write new data into 74HC164 chip. FIGURE 2-1 7-SEGMENT LEDS


B1

B5

B0

B7

A2

B4

A1

A6 8U4

D23011

9108

1

7

2346

5

FG

DP

CO

M1 A

EDCB

CO

M2A0

A4 8U3

D23011

1 5

FGDP

CO

M1A

EDCB

CO

M27

9108

2346

A7

B2

B6

B3

A5

Vcc

A3

FIGURE 2-2 DIMM_NOT

R19

103

R20

561

R22

103

R21

152

Vcc

DIMM_NOT

+12V

2

G

DS1

Q3

FDN302P SOT-23

3

Q4

9014

3

b ec

1

2

2.3" 2 Digit 7-Segment Red Display Board FIGURE 2-3 DIMM_IN AND DIMM_NOT

2.2 Shift Register Data Driver FIGURE 2-4 SHIFT REGISTER DATA DRIVER

U1 74HC164/SOIC7

8

914

345610111213

1

2

GND

CLK

CLRVCC

QAQBQCQDQEQFQGQH

A

B


A4

U6 ULN2003/SOIC

9

45

14

1

13

6

32

8

71112

10

1516

COM

4B5B

3C

1B

4C

6B

3B2B

E

7B6C5C

7C

2C1C

C2

104

12

B4

R1 221

R6 221

+5V

R5 221

B1R12 221

B5R15 221B6

R8 102

A6

R18 102

R16 221

U5 74HC164/SOIC7

8

914

345610111213

1

2

GND

CLK

CLRVCC

QAQBQCQDQEQFQGQH

A

B

A0

R13 221

R11 221

U2 ULN2003/SOIC

B7

9

45

14

1

13

6

32

8

71110

12

1516

COM

4B5B

3C

1B

4C

6B

3B2B

E

7B6C5C

7C

2C1C

R14 221

R7 221+5V

DATA_IN

B3

A2A3

A5

Q29014

1

23

b ec

Q19014

1

23

b ec

R4 221

C4

104

12

CLK_OUTB2

A7

DATA_OUT

A1

R10 221 B0

R3 221R2 221

CLK_OUT

R9 102

1 C1

10pF

2

R17 102

74HC164 chips are used as shift registers, marked as U1, U5, and segments are driven by ULN2003 and 9014. ULN2003 chips, Darlington Driver IC, are directly connected with LED segments and are marked as U2, U6. All 74HC164 on the board are connected in series. Only CMOS signals are received by these pins. All the segments will start to work when clock line, data line and correct signal from DIMM_IN are correct. Characters displayed and their corresponding codes are shown in the following table. TABLE 2-1 CHARACTERS DISPLAYED AND THE CORRESPONDIGN CODES

Segment

Code 0x01 0x02 0x04 0x08 0x10 0x20 0x40 0x80

2.3 Data Ports Definition

FIGURE 2-5 DATA PORTS DEFINITION

Hardware Detail

There’re two IDC sockets which are respectively marked as J1 and J2. J1 is the data input interface and J2 data output interface. An info board can work separately when its J1 is connected with J1 of the demo board and J2 is left open. When more boards are in series, connect J1 of the next board with J2 of the previous board and all the boards can work. Up to 4 boards are recommended to be connected in series. When over 4 boards are connected in series, you must add auxiliary power to provide more current ensuring normal working.

2.4 Auxiliary Power Interface There’re two auxiliary power interfaces on this board. If the power supply used can output higher enough current, 10-pin IDC cable is enough. If the power supply used output low current and many boards are connected in series, it’s suggested to use wires to connect the info boards and the driver board via auxiliary power interfaces, or the current is not enough to drive these boards. Just feed the boards with +12V power supply via auxiliary power interfaces. Make sure the polarity is correct. FIGURE 2-6 AUXILIARY POWER INTERFACE

2.5 Data Buffer

74HC00 chip is used to buffer the clock and DIMM_IN signals since CMOS output signal cannot drive multiple CMOS chips if the cable is too long. FIGURE 2-7 DATA BUFFER

© 2004-2010 Sure Electronics Inc. DE-DP22811_Ver1.0_Page 5


2.6 Connection in Series To cascade our signal enhancing board, please refer to the specific connection diagram as follows: FIGURE 2-7 CONNECTION IN SERIES



USER’S GUIDE


Chapter 3. Electrical Characteristics

Power supply recommended: Input: AC100 to AC200 1A 50 to 60HZ Output: DC 12V 3.25A

For over 4 panels, user must add auxiliary power on the auxiliary power ports, or the 10pin communication port could not carry so much current.

Maximum clock frequency: 1MHz, 4 boards connected in series Suggested Refresh Rate: less than 10Hz Drive Current/segment: 18mA +3mA/-5mA, this value may be changed based on

the production batch, and the dot uses different current: 7mA +1mA/2mA Drive Method: Fully static. Connection Method: 74HC164 in series, SPI like interface. Up to 4 boards are suggested to be connected in series. Interface Voltage Level: VDD*0.8-VDD+0.5V, standard CMOS level. If you need

TTL/CMOS compatible interface in batch, please contact us but the quantity should be no less than 100pcs.



USER’S GUIDE


Chapter 4. Sample Codes

4.1 LED Segment Drive Demo Board’s Schematic FIGURE 4-1 LED SEGMENT DRIVE DEMO BOARD’S SCHEMATIC


OSC1

J1 CON10B

1 23 45 67 89 10

1 23 45 67 89 10

ICSPCLK+5V

C3

22P12

CLK

R3

472

R8 472

+5V

R2

472

+5VU2 78M05/TO

1

4

3VIN

GN

D

VOUT

J3 DJ005B

321

POWER

DIMM

R7

472

+12V

C7

104

12

CLK

+5V

R4 472

+5V

MCLR

R5 472

+5V

POWER

ICSPDAT

DIMM

C1

104

12

C2

22P12

+12V

OSC1

+ C5

100uF/16V

12

DATA

+5V

D1

SS34

1 2

R6 472SW

ICSPDAT

POWER

MCLR

C8

104

12

SW

DATA

+5V

C4

104

12

ICSPCLK

SW1SW DIP-41234

8765

J4 CON 6

123456

R1

472

SW21

2

3

4

U1

PIC16F54/SOIC

123456789 10

1112131415161718RA2

RA3T0CLKIMCLR/VppVSSRB0RB1RB2RB3 RB4

RB5RB6/ICSPCLKRB7/ICSPDAT

VDDOCS2/CLKOUT

OCS1/CLKINRA0RA1

+C6

100UF/10V

12

MCLR

J2

CON2

12

4.2 How to Connect Load FIGURE 4-2 CONNECT LOAD


TABLE 4-1 ENCODER POSITION SETTING

Output Voltage DIP Switch Settings

5V

12V

0V

Note:

1. DIP switch only has the 3 ways as shown above to work; any other switching ways are prohibited.

2. Users shouldn’t change the voltage while LED Segment Drive Demo Board is working. It is only allowed to change it before applying the current.

4.3 How to Display Data with PIC16F54 and PICC9.60 Compiler

Source code is shown below. TABLE 4-2 SOURCE CODE

C code: #include<pic.h> __CONFIG(RC & WDTEN & UNPROTECT); #define uchar unsigned char #define uint unsigned int #define DATA RB5 #define CLK RB3 #define EN RB4 #define keydown RB2 const uchar TAB[19]={0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x3f,0x01,0x02,0x04,0x08,0x10,0x20,0x40,0xff,0x00}; //character library uchar n; uchar flag_g; void delayus(uchar i) { while(i--); } void init(void) { TRISA=0; RA2=1; TRISB=0B00000100; CLK=0; OPTION=0B11000111; n=0; flag_g=0; } void sent_data(uchar sdata) { uchar i; EN=1; //turn off the display, write data to be displayed

© 2004-2010 Sure Electronics Inc. DE-DP22811_Ver1.0_Page 9

Sample Codes


for(i=0;i<8;i++) { CLK=0; delayus(5); if((sdata&0x80)==0x80) DATA=1; else DATA=0; sdata=(sdata<<1); CLK=1; delayus(5); } CLK=0; EN=0; //turn on the display } void delaytime(uchar i) { uint j; for(;i>0;i--) for(j=0;j<400;j++)asm("clrwdt"); } void scankey(void) { uchar i,j; if(keydown==0) { delaytime(25); if(keydown==0) { while(keydown!=1) asm("clrwdt"); n++; n=n%18; for(i=0;i<19;i++) { for(j=0;j<16;j++) { sent_data(TAB[i]); } delaytime(200); } } } } void main() { init(); while(1) { asm("clrwdt"); scankey(); } }


USER’S GUIDE


Chapter 5. Mechanical Drawing FIGURE 5-1 MECHANICAL DRAWING



USER’S GUIDE


Chapter 6. Contact Us

Sure Electronics Co., Ltd. East zone, 3F, Building 6 Jingang Technology Innovation Center No.108 Ganjiabian Rd (ZIP: 210000) Qixia District Nanjing P.R.China Tel: +86-25-68154800-860 Fax: +86-25-68154891-832 Website: www.sure-electronics.com Email: [email protected]


2.3 2 Digit 7-Segment Red Display Board€¦ · input interface and J2 data output interface. An...

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