Serially Interfaced, 8-Digit LED Display Drivers

12

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AND2307SLC

ANODE DP

ANODE A

ANODE F

ANODE B

ANODE G

ANODE C

ANODE E

ANODE D

5

7

9

6

10

4

2

1N5524B

5.6V

±5%

3

88

SEG D

SEG E

SEG C

SEG G

SEG B

SEG F

SEG A

SEG DP

GND

NC1

NC2

IN1

*4.7k

Ω PULLUP REQUIRED FOR MAX7221

( ) MAX7221 ONLY

IN2

NO1

NO2

4

3

8

7

1

10

2

5

9

GND

DIN

LOAD (CS)

V+

16

COM1

COM2

DIG 1

DIG 0

DATA IN

LOAD (CS)

CLOCK

CLK

4.7k

Ω

4.7k

Ω

-5V

5V

2

11

18

19

*

*

IRF540

30k

Ω

IRF540

23

21

20

17

16

15

14

22

4

9

1

12

13

CATHODE

ANODE DP

ANODE A

ANODE F

ANODE B

ANODE G

ANODE C

ANODE E

ANODE D

5

7

9

6

10

4

2

3

CATHODE

AND2307SLC

MAX7219

MAX7221

MAX394

0.1

µF

Figure 2. MAX7219/MAX7221 Driving 2.3in Displays