參數資料
型號: R2025S
廠商: RICOH COMPANY LTD
元件分類: XO, clock
英文描述: High precision I2C-Bus Real-Time Clock Module
中文描述: REAL TIME CLOCK, PDSO14
封裝: 10.10 X 7.40 MM, 3.10 MM HEIGHT, SOP-14
文件頁數: 33/47頁
文件大?。?/td> 524K
代理商: R2025S
R2025S/D
33
Voltage Monitoring Circuit
The VDD 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 1.3v 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 VDD supply voltage monitor is useful for back-up battery checking.
VDET
(D6 in Address Fh)
PON
VDD
2.1v or 1.3v
1s
VDET
0
7.8ms
Sampling timing for
VDD supply voltage
Internal nitiali-
zation period
(1 to 2sec.)
PON
0
VDET
0
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