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RV5C387A Datasheet(PDF) 41 Page - RICOH electronics devices division

Part # RV5C387A
Description  I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

RV5C387A Datasheet(HTML) 41 Page - RICOH electronics devices division

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RV5C387A
Setting CTFG bit to 0
(Increment of
second counter)
(Increment of
second counter)
(Increment of
second counter)
CTFG bit
INTRA pin
Setting CTFG bit to 0
• Level Mode
Approx. 92
µs
CTFG bit
INTRA pin
(Increment of second counter)
Rewriting of the second counter
Relation Between the Mode Waveform and the CTFG Bit
• Pulse Mode
*) In the pulse mode, the increment of the second counter is delayed by approximately 92 µs from the falling edge of clock pulses. Consequently, time
readings immediately after the falling edge of clock pulses may appear to lag behind the time counts of the real-time clocks by approximately 1 second.
Rewriting the second counter will reset the other time counters of less than 1 second, driving the INTRA pin low.
5. 32-kHz Clock Output
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. If the conditions described above are not satisfied, the output is set to
high.
CLEN1
CLEN2
32KOUT pin output
(D3 at Address Fh)
(D4 at Address Eh)
(Nch Open Drain output)
11
OFF(“H”)
0 (Default)
*
Clock pulses
*
0 (Default)
The 32KOUT pin output is synchronized with the CLEN1, CLEN2 bit, settings as illustrated in the timing chart
below.
MAX. 61.0
µs
MAX. 45.8
µs
32KOUT pin
CLEN1 or CLEN2


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