RV5C386A_03 datasheet(37/49 Pages) RICOH | I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC WITH VOLTAGE MONITORING FUNCTION

Part #	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

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RV5C386A

Considerations in Using Oscillation Halt Sensing Circuit

Be sure to prevent the oscillation halt sensing circuit from malfunctioning by preventing the following:

1) Instantaneous power-down on the VDD

2) Condensation on the crystal oscillator

3) On-board noise to the crystal oscillator

4) Applying to individual pins voltage exceeding their respective maximum ratings

In particular, note that the XSTP bit may fail to be set to 1 in the presence of any applied supply voltage as

illustrated below in such events as backup battery installation. Further, give special considerations to prevent

excessive chattering to pewer supply.

VDD

< Supply Voltage Sensing Circuit >

The supply voltage monitoring circuit is configured to conduct a sampling operation during an interval of 7.8ms per

second to check for a drop in supply voltage below a threshold voltage of 2.1 or 1.6 volts for the VDSL bit setting of

0 (the default setting) or 1, respectively, in the control register 2, thus minimizing supply current requirements as

illustrated in the timing chart below. This circuit suspends a sampling operation once the VDET bit is set to 1 in the

control register 2

Internal initialization period

(1 or 2 seconds)

7.8ms

1s

Threshold voltage

of 2.1 or 1.6 volts

Setting 0 to XSTP

and VDET bits

Setting VDET bit to 0

VDD

XSTP

Sampling operation by supply voltage

monitoring circuit

VDET

(D6 at address Fh)

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RV5C386A Datasheet(PDF) 37 Page - RICOH electronics devices division

RV5C386A Datasheet(HTML) 37 Page - RICOH electronics devices division

Similar Part No. - RV5C386A_03

Similar Description - RV5C386A_03

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