RV5C387A datasheet(34/42 Pages) RICOH

Part #	RV5C387A

Description	I2C-bus Real-Time Clock ICs with Voltage Monitoring Function?

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Manufacturer	RICOH [RICOH electronics devices division]

Direct Link	http://www.ricoh.com

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RV5C387A

PRELIMINARY

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- 34 -

14.5.

32-kHz CLOCK OUTPUT

For the RV5C387A, 32.768-kHz clock pulses are output from the 32KOUT pin when either the /CLEN1 bit in

the Control Register 2 or the /CLEN2 bit in the Control Register 1 is set to 0.

When both the /CLEN1 and

/CLEN2 bits are set to 0, the 32KOUT pin output is driven high (off).

For the RV5C387A, 32.768-kHz clock

pulses are output from the 32KOUT pin regardless of such internal register settings.

/CLEN1

(D3 at Address Fh)

/CLEN2

(D4 at Address Eh)

32KOUT PIN

(Nch Open Drain)

1

OFF(H)

0(Default)

*

0(Default)

Clock pulses

For the RV5C387A, the 32KOUT pin output is synchronized with the /CLEN1 and /CLEN2 bit settings as

illustrated in the timing chart below.

32KOUT PIN

Max.61.0

µs

/CLEN1or2

Max.45.8

µs

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