RV5C387A_03 datasheet(40/49 Pages) RICOH

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]

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RV5C387A

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4.2 Periodic Interrupt

Setting of the periodic selection bits (CT2 to CT0) enables periodic interrupt to the CPU. There are two waveform

modes: pulse mode and level mode. In the pulse mode, the output has a waveform duty cycle of around 50%. In the

level mode, the output is cyclically driven low and, when the CTFG bit is set to 0, the output is set to high (OFF).

Waveform Mode, Cycle and Falling Timing

1) Pulse Mode: 2-Hz and 1-Hz clock pulses are output in synchronization with the increment of the second counter

as illustrated in the timing chart on the next page.

2) Level Mode: periodic interrupt signals are output with selectable interrupt cycle settings of 1 second, 1 minute, 1

hour, and 1 month. The increment of the second counter is synchronized with the falling edge of

periodic interrupt signals. For example, periodic interrupt signals with an interrupt cycle setting of

1 second are output in synchronization with the increment of the second counter as illustrated in

the timing chart on the next page.

3) When the oscillation adjustment circuit is used, the interrupt cycle will fluctuate once per 20 seconds as follows:

Pulse Mode: the “L” period of output pulses will increment or decrement by a maximum of

±3.784ms.

For example, 1-Hz clock pulses will have a duty cycle of 50

±0.3784%

Level Mode: a periodic interrupt cycle of 1 second will increment or decrement by a maximum of

±3.784ms.

CT2

CT1

CT0

Description

Waveform Mode

Interrupt Cycle and Fall Timing

00

0—

Off (“H”)

00

1—

Fixed at low (“L”)

010

Pulse Mode*

1

2Hz (Duty cycle of 50%)

011

Pulse Mode*

1

1Hz (Duty cycle of 50%)

100

Level Mode*

2

Once per 1 second (Synchronized with second counter increment)

101

Level Mode*

2

Once per minute (at 00 seconds of every minute)

110

Level Mode*

2

Once per hour (at 00 minutes and 00 seconds of every hour)

111

Level Mode*

2

Once per month (at 00 hours, 00 minutes, and 00 seconds of first day of every month)

(Default setting)

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RV5C387A Datasheet(PDF) 40 Page - RICOH electronics devices division

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