4 inch character height 7-segment led information board user's

4 inch Character Height 7-segment LED Information Board

User’s Guide

© 2004-2008 Sure Electronics Inc. DE-DP004-Ver1.0


User’s Guide

© 2004-2008 Sure Electronics Inc.

Table of contents

Chapter1.Overview and Main Feature .............................................................................. 11-1. Overview .................................................................................................................... 11-2. Part Layout.................................................................................................................. 21-3. Main Feature ............................................................................................................. 3

Chapter2.Hardware Detail .................................................................................................... 42-1. Schematic ................................................................................................................ 42-2. Physical Dimension ............................................................................................... 52-3. Circuit Diagram ....................................................................................................... 52-4. Electric Characters................................................................................................. 62-5. Port Definition ......................................................................................................... 7

2-5-1. 7-segment LED............................................................................................ 72-5-2. Shift Register Data Drive ........................................................................... 72-5-3. Data Ports Definition .................................................................................. 82-5-4. Auxiliary Power Port ...................................................................................92-5-5. Data Buffer ................................................................................................... 9

Chapter3.Sample Codes ..................................................................................................... 113-1. LED Segment Drive Demo Board’s Schematic ............................................... 113-2. How to Connect Load .......................................................................................... 123-3. How to display data with PIC10F200 and PICC8.05 environment................ 12

Chapter4.Contact Us ............................................................................................................ 15

DE-DP004-Ver1.0-page i


User’s Guide

Table of contents

NOTES:

Product Version ： Ver 1.0

Document Version ： Ver 1.0

DE-DP004-Ver1.0-page ii © 2004-2008 Sure Electronics Inc.


User’s Guide


Chapter1.Overview and Main Feature

4 digits 7segment panels are manufactured by Sure Electronics. This series includes 5 different size panels, such as 1.5 inches, 1.8 inches, 2.3 inches, 4 inches, and 7 inches (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 Microcontrollers. They could be widely used in panel meters, big clocks and any other information display usage.

Sure Electronics provides series of such information boards which are supposed to reduce your development time and make them standard. In this series, most boards are 4 digits and static, if customer needs any special digits and special size ones, you could contact us with the contact information at the end of this document. The 4 inch character height one is 2digit/board. The 7inch character height one is 1digit/board.

This document is used to describe how to use 4 inch character height panels.

1-1. Overview

DE-DP004-Ver1.0-page 1

Overview and Main Feature

1-2. Part Layout

Figure Top Part Layout

Figure 1 Bottom Part Layout

© 2004-2008 Sure Electronics Inc.DE-DP004-Ver1.0-page 2

Overview and Main Feature

© 2004-2008 Sure Electronics Inc. DE-DP004-Ver1.0-page 3

1-3. Main Feature

1-3-1. 2 digits 7-segment 4 inches LEDs are installed on this panel, those segments are common anode type.

1-3-2. 2*10pin interface for power serializing and data transferring, data inputs from J1 and flows out from J2.

1-3-3. A 74HC00 Nand chip is used to buffer CLK_IN and DIMM_IN control signal.

1-3-4. LED driver chips are composed of 2pcs of 74HC595, 2pcs MMBT9014 and 2pcs of ULN2003, they are serialized to each other, the first chip receives data from Microcontroller or the board ahead, the final chip shifts data to next boards. Data should be clocked in from CLK_IN and DATA_IN in J1, and DIMM_IN pin should be pulled down to enable display. ULN2003 is used to drive the cathode of those led segments.


User’s Guide


2-1. Schematic

Figure 2 Note: Because of the LED's voltage drop difference, the resistance may vary from the value

Chapter2.Hardware Detail

DA

TA_O

UT

U4

ULN

2003

9

45

14

1

13

6 3 2 8711 1210 15 16

CO

M

4B5B

3C

1B

4C

6B 3B 2B E7B6C 5C7C 2C 1C

A3

B5

U5B

74H

C00

4 56

14 7

U5D

74H

C00

12 1311

14 7

B2

+5V

+12V

R7

331

DIM

M_O

UT

A7

U5A

74H

C00

1 23

14 7

U7

ULN

2003

9

45

14

1

13

6 3 2 8711 1210 15 16

CO

M

4B5B

3C

1B

4C

6B 3B 2B E7B6C 5C7C 2C 1C

A4

CLK

_OU

T

+5V

A6

C7

104

1 2

R5

331

R4

331

A4

U5C

74H

C00

9 108

14 7

J2C

ON

10B

1 2 3 4 5

6 7 8 9 10

R2

331

+12V

DIM

M_O

UT

A1

+12V

A5

CLK

_OU

T

A2

B3

C4

104

1 2

DIM

M_O

UT

R8

152

C8

104

1 2

A5

C3

104

1 2

B7

D1

1N58

191

2

R9

102

U8

78M

05/T

O1

4

3V

IN

GNDVO

UT

C10

104

1 2

R6

331

B1

+C

5

10V

/100

UF

1 2

A2

J4 CO

N2

1 2

B2

DAT

A_I

N

R18

102

J1C

ON

10B

1 2 3 4 5

6 7 8 9 10

DIM

M_I

N

+12V

B0

U6

74H

C59

5

7

8

9

14

3 4 5 6

10 111213

1 21516

QH

GN

D

QH

'

SI

QD

QE

QF

QG

SC

LR

SC

KR

CK

G

QB

QC

QA

VC

C

B5

+C

1

25V

,470

uF

1 2

+12V

B6

R15

331

C6

104

1 2

+12V

A6

+12V

R17

152

R11

331

A7

A3

+12V

U3

74H

C59

5

7

8

9

14

3 4 5 6

10 111213

1 21516

QH

GN

D

QH

'

SI

QD QE

QF

QG

SC

LR

SC

KR

CK

G

QB

QCQA

VC

C

C9

104

1 2

DIM

M_I

N

J3 CO

N2

1 2

+12V

B1

+5V

DA

TA_I

N

R10

331

B4

B7

R12

331

DA

TA_O

UT

+C

2

25V

,470

uF

1 2

A1

+12V

B3

A0

B0

CLK

_IN

R14

331

+5V

CLK

_OU

T

R3

331

+5V

A0

B4

R13

331

R1

331

R16

331

Q2

9014

2

13

CLK

_IN

Q1

9014

2

13

8U

1

D40

011

9 10 5

1

7 2346

8

F G DP

COM1

A EDCB

COM2

B6

8U

2

D40

011

9 10 5

1

7 2346

8

F GD

P

COM1

A EDCB

COM2

Hardware Detail

marked in the schematic. 2-2. Physical Dimension

Figure 32-3. Circuit Diagram


Hardware Detail

Figure 4

Figure 5 2-4. Electric Characters

Power Supply: DC12V (Low9V-High13V), 0.16A/pcs (Maximum), for each additional panel, adding another 0.16A, if voltage is less than 9V, the brightness would not be enough.

For over 2 panels, users must add auxiliary power on the auxiliary power, or the 10pin communication port could not carry so much current.

Maximum clock freq: 1MHz, 4 boards serialized 100KHz, 20 boards serialized

If the communication speed is too high, it may cause communication problems.

Suggested Refresh Rate: Less than 10Hz if DIMM is not used. Less than 50Hz if DIMM is used.

Drive Current/segment: 10mA +3mA/-2mA, this value may be changed based on the production batch, and the dot uses different current.

Drive Method: Fully static.

Connection Method: 74HC595 in series, SPI like interface.

Maximum Cascade Level: 20 boards in series, clock less than 100 kHz.


Hardware Detail

Interface Voltage Level: 4-5.5V, standard CMOS level. If you need TTL/CMOS compatible interface in batch, please contact us but the quantity should be no less than 100pcs.

2-5. Port Definition 2-5-1. 7-segment LED


Figure 6 2 Digits of 4 inches, common anode, high brightness red 7-segment LEDs are installed on this board. They are marked as U1-2. 2-5-2. Shift Register Data Drive

Figure 7

A6 B6B58

U1

D40011

9105

1

7

2346

8FGDP

CO

M1A

EDCB

CO

M2

A2A3

A0 B0

8U2

D40011

9105

1

7

2346

8

FG

DP

CO

M1 A

EDCB

CO

M2

B7A7

B2

+12V

A1

B3

A5A4 B4

B1

U6 74HC595

7

8

9

14

3456

10

1112

13

12

1516

QH

GND

QH'

SI

QDQEQFQG

SCLR

SCKRCK

G

QBQC

QAVCC

R14 331

B6B5

Q2

90142

13

A2

R6 331

A3

R11 331

R1 331

B4

R2 331

R7 331A7

R16 331

R12 331

A0

R15 331

DIMM_OUT

A1

B1

R3 331

R10 331

+5VU3 74HC595

7

8

9

14

3456

10

1112

13

12

1516

QH

GND

QH'

SI

QDQEQFQG

SCLR

SCKRCK

G

QBQC

QAVCC

B2

DATA_IN

DATA_OUT R18 102

U7 ULN2003

9

45

14

1

13

6

32

8

71112

10

1516

COM

4B5B

3C

1B

4C

6B

3B2B

E

7B6C5C

7C

2C1C

Q1

90142

13

R9 102

R13 331

R8 152

U4 ULN2003

9

45

14

1

13

6

32

8

71110

12

1516

COM

4B5B

3C

1B

4C

6B

3B2B

E

7B6C5C

7C

2C1CCLK_OUT

R5 331

B7

B0

R4 331

+5V

B3

R17 152

A6

A4A5

Hardware Detail

74HC595 is used as shift register in this board. They are U3 and U6, the parallel output of those 74HC595 is connected to the base of ULN2003, and the collector of those ULN2003 is connected to the LED segments. CLK_OUT is driven by a buffered output from CLK_IN with 74HC00. DATA_IN is data input pin of the first 74HC595, then all 74HC595 of cascaded boards will be serialized. All those pins receive only CMOS signals. DIMM_IN signal is for brightness control usage, you could add simple on/off or PWM signal on this signal, when this signal is set to low, all segments will be lighted on if valid data is shifted out from the 74HC595 chip. If you change the data in the 74HC595 driven chip, you should set this pin to low in order that the hash signal will not affect the display. Of course if you want to adjust the brightness of those LEDs, PWM signal could be applied on the DIMM_IN pin. It is buffered with a 74HC00, and DIMM_IN signal will drive this board and next. Once you clock in correct data through these 2 pins, and ensure that PWM signal or ON/OFF signal is applied correctly on the DIMM_IN pin, the board will begin to display. Correspondence between Character Codes and Character Patterns:

Character Patterns 0 1 2 3 4 5 6 7 8 9

Character Codes 0xfc 0x6

00xda 0xf2 0x6

60xb6

0xbe

0xe0 0xfe 0xf6

Character Patterns a b c d E f g h i j

Character Codes

0xee

0x3e

0x1a

0x7a

0x9e

0x8e 0xf6 0x6

e0x60

0x70

Character Patterns l n o p Q r s t u y

Character Codes

0x1c

0x2a

0x3a

0xce

0xe6

0x0a

0xb6

0xe0

0x38

0x76

2-5-3. Data Ports Definition


Figure 8

2 IDC sockets are located on the board. They are data input and output interface, marked as J1 and J2. The definition is shown in Figure 11. When the board is working separately, connect J1 to the Microcontroller board and leave J2 open. If lots of same boards are in series, connect next board’s input to previous one’s output. Then you could connect up to

CLK_IN

+12V+12V +12VJ2 CON10B

12345

6789

10DATA_IN

+12V

CLK_OUT

J1 CON10B

12345

6789

10

DIMM_IN DIMM_OUTDATA_OUT

Hardware Detail

20 boards in series. Notice if over 4pcs of such boards were serialized, you must add auxiliary power cable to some boards to enhance the current transfer.

2-5-4. Auxiliary Power Port

Figure 9 There are 2 auxiliary power ports on this board. If you use less than 4pcs of such boards in series, you could simply use a 10pin IDC flat cable to connect those boards. But if over 4 boards are connected together, you must add additional power supply to some of those boards, or the current may be lacking. Just apply +12V to some boards on the AUX power port. Make sure the polarity is correct.

2-5-5. Data Buffer


U5C

74HC00

9

108

14

7

DIMM_IN

CLK_INCLK_OUT

U5D

74HC00

12

1311

14

7

+5V

DIMM_OUT

U5A

74HC00

1

23

14

7

U5B

74HC00

14

4

56

7

Hardware Detail


Figure 10

74HC00 chip is used to buffer Clock and DIMM signal in this board. A CMOS chip is not able to drive over 10pcs CMOS input if the cable is so long, here 74HC00 is used as NOT gate, and 2 gates in series is a buffer.


User’s Guide


Chapter3.Sample Codes

3-1. LED Segment Drive Demo Board’s Schematic


Figure 11

R4 472

DATA

SW2SW DIP-41234

8765

POWER

ICSPCLK

C5

104

12

C1

104

12

U2 78M05/TO

1

4

3VIN

GN

D

VOUT

DIMM

+5V

+12V

R3 472

J4 DJ005B

321

J2 CON 6

123456

+ C2

100uF/16V

12

U1 PIC10F200

4

1 6

5

3

2

GP2/T0CKI/FOSC4

GP0/ICSPDAT GP3/MCLR/VPP

VDD

GP1/ICSPCLK

VSS

+5V

DIMMCLK

+12V

MCLR+5V

CLK R5 472

R1

472

SW1

+5VPOWER

D11N58171 2

ICSPCLK

POWER

ICSPDAT

ICSPDATR2 472

J3

CON2

12

DATA

4

+C3

100UF/10V

12

+5V

1

2

3

C4

104

12

MCLR

J1 CON10B

12345

6789

10

Sample Codes

3-2. How to Connect Load

10 Pin IDC Flat Cable

J1

J4

J3 J2

4 inch LED Board

+J1-

LED SegmentDrive DemoBoard

Power Supply form J3 or J4DC 12V,1A Input

Figure 12

OutputVoltage Encoder Position Setting(1)(2)

5V

4 3 2 1

+5V

12V +12V

4 3 2 1

0V 0V

4 3 2 1

ON

OFF

Notice:

(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.

3-3. How to display data with PIC10F200 and PICC8.05 environment Source code is shown below,

#include <pic.h>

__CONFIG(UNPROTECT&MCLRDIS&WDTDIS); //Configure Word


Sample Codes


#define Fuc_key GP3 #define DIMM GP2 #define CLK GP1 #define DATA GP0

unsigned char disp_data; unsigned char key_pressed,last_key_pressed; unsigned char Value; unsigned char time;

//The total of cathode const unsigned char Digital_TAB[] = {0xff,0xfc,0x60,0xda,0xf2,0x66,0xb6,0xbe,0xe0,0xfe,0xf6, 0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};

void change(void); void LED_data(void); void LED_display(void);

void delay_2ms(void) { unsigned char i, j, k; for(i = 0; i < 5; i++) { for(j = 0; j < 200; j++) k--; } }

void change(void) { key_pressed=Fuc_key; if((key_pressed==0)&(last_key_pressed==1)) { delay_2ms(); if(key_pressed==0) { disp_data++; if(disp_data==19)disp_data=0; } } last_key_pressed=key_pressed; }

void LED_data(void) { unsigned char i;

for(i = 0; i <19; i++) { if(i==disp_data){Value = Digital_TAB[i];} }

Sample Codes


}

void LED_display(void) { unsigned char i; unsigned char U;

U=Value; for(i = 0;i < 8; i++) { DATA = U & 0x01; CLK = 0; CLK = 1; U = U>>1; } U=Value; for(i = 0;i < 8; i++) { DATA = U & 0x01; CLK = 0; CLK = 1; U = U>>1; } CLK = 0; CLK = 1; }void main(void) { OSCCAL=0; TRIS = 0b11111000; OPTION=0b11011111;

while(1) { change(); LED_data(); DIMM = 1; LED_display(); DIMM = 0; //Active–low Output Enable

delay_2ms(); } }


User’s Guide


Chapter4.Contact Us

Sure Electronics Co., Ltd. Floor 5, A zone, Qinhuai Technology Innovation center, NO.105-2, DaMing Road, Nanjing, China Tel: +8613601408832 +86-25-66606340

(English service, from GMT1-10AM, only for technical questions) Email: [email protected] Website: www.sure-electronics.net www.sure-electronics.com

www.sureelectronics.net


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