NR8576BB 데이터 시트보기 (PDF) - Nippon Precision Circuits

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NR8576BB

Real-time clock module

Nippon Precision Circuits  

FOUT

FOUT

NR8576 Series

tf2

10%

tH

90%

tr2

t

Disable/Enable

FOE

tZH

50%

tHZ

50%

50%

Duty=

tH

t

X

100(%)

FOUT

FOE

10%

tZL

50%

90%

tLZ

50%

FOUT

90%

10%

Note that FOE and FSEL do not have chatter elimination circuits. Consequently, switching either FOE or

FSEL during 32 kHz mode operation may generate chatter noise on the FOUT output. Also, note that the 1 Hz

and 32 kHz oscillators are not synchronized to each other, so switching intervals shortens the duty cycle.

Accordingly, a wait time (≥ chattering time + output frequency period) should be incorporated when switching

intervals.

NIPPON PRECISION CIRCUITS—7

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