7228AIBIZ 查看數據表（PDF） - Renesas Electronics

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产品描述 (功能)

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7228AIBIZ

8-Digit, Microprocessor-Compatible, LED Display Decoder Driver

Renesas Electronics 

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 WRITE CYCLE

INTERDIGIT BLANKING

INTERNAL SIGNAL

D2

D5

D1

D7

TYPICAL DIGITS D8

OUTPUT PULSES D6

D4

D3

10s (TYP)

FREE RUNNING

320s (TYP)

FREE RUNNING (PER DIGIT)

INTERDIGIT BLANKING

FIGURE 4. DISPLAY DIGITS MULTIPLEX (COMMON ANODE DISPLAY)

FN3160 Rev 9.00

August 19, 2015

Page 7 of 19

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