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RV5C386A Datasheet(PDF) 8 Page - RICOH electronics devices division

Part No. RV5C386A
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

RV5C386A Datasheet(HTML) 8 Page - RICOH electronics devices division

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RV5C386A
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5. Oscillation Halt Sensing Function and Supply Voltage Monitoring Function
The RV5C386A incorporates an oscillation halt sensing circuit equipped with internal registers configured to record
any past oscillation halt, thereby identifying whether they are powered on from 0 volts or battery backed-up. As
such, the oscillation halt sensing circuit is useful for judging the validity of time data.
The RV5C386A also incorporates a supply voltage monitoring circuit equipped with internal registers configured to
record any drop in supply voltage below a certain threshold value. Supply voltage monitoring threshold settings can
be selected between 2.1 and 1.6 volts through internal register settings.
The oscillation halt sensing circuit is configured to confirm the established invalidation of time data in contrast to
the supply voltage monitoring circuit intended to confirm the potential invalidation of time data. Further, the supply
voltage monitoring circuit can be applied to battery supply voltage monitoring.
6. Periodic Interrupt Function
The RV5C386A incorporates a periodic interrupt circuit configured to generate periodic interrupt signals aside from
interrupt signals generated by the alarm circuit for output from the INTRA pin. Periodic interrupt signals have five
selectable frequency settings of 2Hz (once per 0.5 seconds), 1Hz (once per 1 second), 1/60Hz (once per 1 minute),
1/3600Hz (once per 1 hour), and monthly (the first day of every month). Further, periodic interrupt signals also
have two selectable waveforms of a normal pulse form (with a frequency of 2Hz or 1Hz) and special form adapted to
interruption from the CPU in the level mode (with second, minute, hour, and month interrupts). The register
records of periodic interrupt signals can be monitored by using a polling function.
7. 32-kHz Clock Output Function
The RV5C386A incorporates a 32-kHz clock circuit configured to generate clock pulses with the oscillation
frequency of a 32.768kHz crystal oscillator for output from the 32KOUT pin (CMOS push-pull output). The 32-kHz
clock output is enabled and disabled when the CLKC pin is held “H”, and “L” or open, respectively.


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