2.3 Character Height 7-Segment LED Information Board User ...sure-electronics.net/mcu,display/DE-DP003.pdf · Hardware Description Figure 7 2-4. Electric Characters Power Supply:

2.3" Character Height 7-Segment LED Information Board

User’s Guide

© 2004-2008 Sure Electronics Inc. DE-DP003-Ver1.0


User’s Guide

© 2004-2008 Sure Electronics Inc.

Table of contents

Chapter1.Overview and Main Feature .........................................................................11-1. Overview ...................................................................................................................................... 1

1-2. Part Layout ........................................................................................................2Chapter2. Hardware Description ..................................................................................4

2-1. Schematic..........................................................................................................4 2-2. Physical Dimension..........................................................................................5 2-3. Circuit Diagram.................................................................................................5 2-4. Electric Characters...........................................................................................6

2-5-1. 7-segment LED ......................................................................................7 2-5-2. Shift Register Data Driver.....................................................................7 2-5-3. Data Ports Definition.............................................................................8 2-5-4. Auxiliary Power Port .............................................................................8 2-5-5. Data Buffer .............................................................................................9

Chapter3. Sample Codes ..............................................................................................103-1. LED Segment Drive Demo Board’s Schematic............................................10 3-2. How to Connect Load.....................................................................................10 3-3. How to display data with PIC10F200 and PICC8.05 environment..............11

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

DE-DP003-Ver1.0-page i


User’s Guide


Table of contents

NOTES:

Product Version ： Ver 1.0

Document Version ： Ver 1.0

DE-DP003-Ver1.0-page ii


User’s Guide


Chapter1.Overview and Main Feature

4 digits 7segment panels are manufactured 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 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 need any special digits and special size ones, could contact us with the contact information at the end of this document. The 7 inch character height one is 1digit/board.

This document is used to describe how to use 2.3inches character height panels.

1-1. Overview

Figure 1

DE-DP003-Ver1.0-page 1

Overview and Main Feature

1-2. Part Layout

Figure 2 Top Part Layout

Figure 3 Bottom Part Layout

© 2004-2008 Sure Electronics Inc. DE-DP003-Ver1.0-page 2

Overview and Main Feature


1-3-1. 4 digits 7-segment 2.3inches 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 4pcs of 74HC595 and 5pcs 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 pull to low to enable display. ULN2003 is used to drive the cathode of those led segments.


User’s Guide


2-1. Schematic

Figure 4 Note: Because of the LED's voltage drop difference, the resistance may vary from the value marked in the schematic.

Chapter2. Hardware Description

A2

R11

471

C8

104

1 2

D7

DIM

M_O

UT

R32

152

C1

U15

78M

05/T

O1

4

3V

IN

GND

VO

UT

R2

471

B4

C5

A1

8U

4

D23

011

9 10 8

1

7 2346

5

F GD

P

COM1

A EDCB

COM2

U12

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

+C

1 10V/100UF

1 2A2

DA

TA_I

N

C5

104

1 2

A7

DA

TA_O

UT

D6

R14

471

+5V

A1

D6

DA

TA_I

N

U14

A

74H

C00

1 23

14 7

+12V

U9

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

+5V

D5

B5

U6

ULN

2003

9

45

14

1

13

6 3 2 8711 1210 15 16

CO

M

4B5B

3C

1B

4C


CLK

_OU

T

B7

C2

A0

D3

C0

+12V

C4

D4

A3

C4

A7

R22

471

B0

C7

U11

ULN

2003

9

45

14

1

13

6 3 2 8711 1210 15 16

CO

M

4B5B

3C

1B

4C


U13

ULN

2003

9

45

14

1

13

6 3 2 8711 1210 15 16

CO

M

4B5B

3C

1B

4C


+12V

D7

R29

471

U10

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

+12V

A0

CLK

_IN

U14

C

74H

C00

9 108

14 7

R3

471

+5V

B4

DIM

M_O

UT

8U

1

D23

011

9 10 8

1

7 2346

5

F G DP

COM1

A EDCB

COM2

8U

2

D23

011

9 10 8

1

7 2346

5

F GD

P

COM1

A EDCB

COM2

C13

104

1 2

CLK

_OU

T

J1 CO

N10

B

1 2 3 4 5

6 7 8 9 10

DIM

M_I

N

R13

471

R12

471

D0

+

C3 25V,470uF

12

A4

C1

R28

471

C9

104

1 2

C10

104

1 2

U5

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

DA

TA_O

UT

D2

R6

471

CLK

_IN

R7

471

B0

R30

471

C11

104

1 2

A5

J2 CO

N10

B

1 2 3 4 5

6 7 8 9 10

R24

152

B2

+5V

R19

471

R18

471

R10

471

C3

R23

471

D2

A3

C5

R20

471

R25

471

+

C4 25V,470uF

12

DIM

M_I

N

B2

D5

B3

R1

471

U14

B

74H

C00

4 56

14 7

C0

D4

C6

104

1 2

D1

+12V

B5

C6

U7

ULN

2003

9

45

14

1

13

6 3 2 8711 1210 15 16

CO

M

4B5B

3C

1B

4C


R16

152

R8

152

R5

471

D3

U14

D

74H

C00

12 1311

14 7

A4

8U

3

D23

011

9 10 8

1

7 2346

5

F G DP

COM1

A EDCB

COM2

R26

471

A6

R21

471

B3

B7

C12

104

1 2

R9

471

B1

A5

C7

104

1 2

C7

R17

471

+5V

D0

C2

C3

R31

471

CLK

_OU

T

B6

A6

+C

2 10V/100UF

1 2

B6

B1

R27

471

DIM

M_O

UT

+5V

D1

+5V

R15

471

U8

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

+12V

C6

R4

471

Hardware Description

2-2. Physical Dimension

Figure 52-3. Circuit Diagram

Figure 6



Figure 72-4. Electric Characters

Power Supply: DC12V (Low9V-High13V), 0.3A/pcs (Maximum), for each additional panel, add another 0.3A, if voltage is less than 9V, the brightness would not be enough.

For over 4 panels, user 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 100kHz.

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 Definition2-5-1. 7-segment LED


Figure 8 4 Digits of 2.3 inches, common anode, high brightness red 7-segment LEDs are installed on this board. They are marked as U1-4.

2-5-2. Shift Register Data Driver

Figure 9

74HC595 is used as shift register in this board. They are U5, U8, U10, and U12, the parallel output of those 74HC595 was connected to the base of ULN2003, and collector of those ULN2003 was 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 accept 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 light on if valid data is shifted out from the 74HC595 chip. If you are changing the data in the 74HC595driven chip, set this pin to low then 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 display.

Correspondence between Character Codes and Character Patterns:

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

Character Codes 0xfc 0x60 0xda 0xf2 0x66 0xb6 0xbe 0xe0 0xfe 0xf6

D78U4

D23011

9108

1

7

2346

5

FG

DP

CO

M1 A

EDCB

CO

M2

A2

A

A

7

1

D6B7

A0

C4

B0

C7

+12V

B48U1

D23011

9108

1

7

2346

5

FGDP

CO

M1A

EDCB

CO

M2

8U2

D23011

9108

1

7

2346

5FG

DPC

OM

1 A

EDCB

CO

M2

A4

C1B2 D2

A3

C5 D5

B3

C0

D4

D1

B5C6

D38U3

D23011

1 5

FGDP

CO

M1A

EDCB

CO

M27

9108

2346

A5

D0

C2C3

A6 B6

B1

CLK_OUT

+5V

DATA_INDIMM_OUT

U12 74HC595

7

8

9

14

3456

10

1112

13

12

1516

QH

GND

QH'

SI

QDQEQFQG

SCLR

SCKRCK

G

QBQC

QAVCC

+5V

U5 74HC595

7

8

9

14

3456

10

1112

13

12

1516

QH

GND

QH'

SI

QDQEQFQG

SCLRQBQC

QAVCC

SCKRCK

G

DATA_OUT


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

Character Codes 0xee 0x3e 0x1a 0x7a 0x9e 0x8e 0xf6 0x6e 0x60 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

Figure 10

2-5-3. Data Ports Definition


Figure 11

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 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 12

AUXpower

AUXpower

DIMM_OUT

+12V +12VJ1

CON10B

12345

6789

10

DIMM_IN

+12V

DATA_OUT

J2

CON10B

12345

6789

10DATA_IN CLK_OUTCLK_IN

+12V


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 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. And be sure the polarity is correct.

2-5-5. Data Buffer


Figure 13

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.

DIMM_OUT

U14A

74HC00

1

23

14

7

CLK_IN

U14C

74HC00

9

108

14

7

DIMM_IN

U14B

74HC00

4

56

14

7

U14D

74HC00

12

1311

14

7

+5V

CLK_OUT


User’s Guide


Chapter3. Sample Codes

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


Figure 14

3-2. How to Connect Load

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

J4

J3 J- 1

10 Pin IDC Flat Cable

DC 12V,1A InputPower Supply form J3 or J4

LED SegmentDrive DemoBoard

J1+

J2

2.3inch LED Board

Figure 15

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

� 2004-2008 Sure Electronics Inc. DE-DP003-Ver1.0-page 12

#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; } 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();

Sample Codes


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


2.3 Character Height 7-Segment LED Information Board User ...sure-electronics.net/mcu,display/DE-DP003.pdf · Hardware Description Figure 7 2-4. Electric Characters Power Supply:

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