參數(shù)資料
型號(hào)： RS5C348B-E2
廠商： RICOH COMPANY LTD
元件分類： XO, clock
英文描述： Real-Time Clock
中文描述： 0 TIMER(S), REAL TIME CLOCK, PDSO10
封裝： 6.40 X 3.50 MM, 1.25 MM HEIGHT, 0.5 MM PITCH, SSOP-10
文件頁(yè)數(shù)： 37/53頁(yè)
文件大小： 452K
代理商： RS5C348B-E2
R
×
5C348A/B
34
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 V
DD
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RS5C372A 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C bus SERIAL INTERFACE REAL-TIME CLOCK ICs
RS5C372B 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP)
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RS5C372B-E2 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:I2C-bus Serial Interface Real Time Clock (8pin SSOP)
RS5C373A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Real-Time Clock
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