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RV5C386A Datasheet(PDF) 31 Page - RICOH electronics devices division

Part No. RV5C386A
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
Logo RICOH - RICOH electronics devices division

RV5C386A Datasheet(HTML) 31 Page - RICOH electronics devices division

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PRELIMINARY
RV5C386A
12345
- 31 -
< 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 in the oscillation halt sensing circuit.
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 1.6v 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.
VDET
(D6 at Address Fh)
XSTP
VDD
Threshold voltage of 2.1 or 1.6v
1s
VDET
←0
7.8ms
Sampling operation by supply
voltage monitoring circuit
Internal initiali-
zation period
(1 to 2 sec.)
XSTP, VDET
←0


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