ICM7228(1997) Ver la hoja de datos (PDF) - Intersil

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componentes Descripción

Fabricante

ICM7228
(Rev.:1997)

8-Digit, Microprocessor Compatible, LED Display Decoder Driver

Intersil 

ICM7228

DIGIT

STROBE

INTERDIGIT

BLANKING

VDD

P

≈200mA

COMMON

ANODE

N

N

N DIGIT

≈2kΩ OUTPUT

SHUTDOWN

VSS

N

≈2kΩ

VSS

NOTE: When SHUTDOWN goes low INTERDIGIT BLANKING also

stays low.

FIGURE 12A. DIGIT DRIVER

SEGMENT

DATA

INTERDIGIT

BLANKING

VDD

P

≈200mA

100Ω

N

N

≈2kΩ

COMMON

CATHODE

SEGMENT

OUTPUT

SHUTDOWN

VSS

N

≈2kΩ

VSS

NOTE: When SHUTDOWN goes low INTERDIGIT BLANKING also

stays low.

FIGURE 13B. SEGMENT DRIVER

FIGURE 13. COMMON CATHODE DISPLAY DRIVERS

VDD

VDD

SEGMENT

DATA

INTERDIGIT

BLANKING

SHUTDOWN

VDD

P

≈2kΩ

COMMON

ANODE

N

SEGMENT

≈75Ω OUTPUT

VSS

DIGIT

OUTPUT

ICM7228A/B

VDD

SEGMENT

OUTPUT

VDD

10K

UP TO

4A

FIGURE 12B. SEGMENT DRIVER

FIGURE 12. COMMON ANODE DISPLAY DRIVERS

DIGIT

STROBE

INTERDIGIT

BLANKING

SHUTDOWN

VDD

P

≈2kΩ

COMMON

CATHODE

N

DIGIT

≈15Ω OUTPUT

VSS

VSS

VSS

FIGURE 14. DRIVING HIGH CURRENT DISPLAY, COMMON

ANODE ICM7228A/C TO COMMON ANODE DISPLAY

VDD

VDD

100Ω

SEGMENT

OUTPUT

ICM7228C/D

VDD

2N2219

14Ω (100mAPEAK)

FIGURE 13A. DIGIT DRIVER

DIGIT

OUTPUT

N

≈15Ω

14mA

2N6034

1.4APEAK

VSS

VSS

FIGURE 15. DRIVING HIGH CURRENT DISPLAY, COMMON

CATHODE ICM7228B/D TO COMMON CATHODE

DISPLAY

9-31

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