ICM7228(1997) 데이터 시트보기 (PDF) - Intersil

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ICM7228
(Rev.:1997)

8-Digit, Microprocessor Compatible, LED Display Decoder Driver

Intersil 

ICM7228

Timing Diagrams

MODE

WRITE

INPUT

DATA

tMS

tMH

tWL

tWH

tDS

tDH

VALID

FIGURE 1. ICM7228A/B WRITE CYCLE

MODE

WRITE

(D1)

CONTROL WORD

WRITE DATA

8 PULSES

TYPE OF DECODER?ID6

DECODE/NO DECODE? ID5

SHUTDOWN?ID4

DATA COMING ID7

(D8) DON’T CARE

CONTROL WORD

TYPE OF DECODER?ID6

DECODE/NO DECODE? ID5

SHUTDOWN? ID4

DATA COMING ID7

FIGURE 2. ICM7228A/B SEQUENTIAL 8-DIGIT RAM UPDATE

DIGIT

ADDRESS

DAO-DAZ

WRITE

DATA

VALID

tAS

tWL

tDS

tAH

tWH

tDH

VALID DATA

FIGURE 3. ICM7228C/D WRITE CYCLE

INTERDIGIT BLANKING

INTERNAL SIGNAL

D2

D5

D1

D7

TYPICAL DIGITS D8

OUTPUT PULSES D6

D4

D3

10µs (TYP)

FREE RUNNING

320µs (TYP)

FREE RUNNING (PER DIGIT)

INTERDIGIT BLANKING

FIGURE 4. DISPLAY DIGITS MULTIPLEX (COMMON ANODE DISPLAY)

Typical Performance Curves

-55oC

0

25oC

125oC

100

200

80

125oC

25oC

300

60

400

40

-55oC

25oC

125oC

500

-55oC

5.0

4.0

3.0

2.0

1.0

0

VDD-VDIG (V)

FIGURE 5. COMMON ANODE DIGIT DRIVER IDIG vs (VDD - VDIG)

20

0

0

1.0

2.0

3.0

4.0

5.0

VSEG (V)

FIGURE 6. COMMON ANODE SEGMENT DRIVER ISEG vs VSEG

9-23

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