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R2023K Datasheet(PDF) 38 Page - RICOH electronics devices division

Part # R2023K
Description  2-wire Serial Interface Real Time Clock IC
PDF  50 Pages
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Manufacturer  RICOH [RICOH electronics devices division]
Direct Link  http://www.ricoh.com
Logo RICOH - RICOH electronics devices division

R2023K Datasheet(HTML) 38 Page - RICOH electronics devices division

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R2023K/T
38
• Voltage Monitoring Circuit
The supply 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 1.6 or 1.3v 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.
The supply voltage monitor is useful for back-up battery checking.
VDET
(D6 in Address Fh)
PON
VDD
1.6v or 1.3v
1s
VDET
←0
7.8ms
Sampling timing for
VDD supply voltage
Internal
initialization
period
(1 to 2sec.)
PON
←0
VDET
←0



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