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參數(shù)資料
| 型號： | R2051K |
| 英文描述： | real-time clock ICs |
| 中文描述： | 實時時鐘IC |
| 文件頁數(shù)： | 38/53頁 |
| 文件大?。?/td> | 343K |
| 代理商： | R2051K |
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R2051 Series
G
Voltage Monitoring Circuit
R2051 incorporates two kinds of voltage monitoring function. These are shown in the table below.
VCC Voltage Monitoring Circuit
12345
Rev.1.04 - 38 -
VDD Voltage Monitoring Circuit
(VDET)
Back-up battery checker
VDD pin (supply voltage for the
internal RTC circuit)
Store in the Control Register 2
(D6 in Address Fh)
Purpose
Monitoring supply voltage
CPU reset output
VCC pin
Output for result
/VDCC pin
Function
After falling VCC, /VDCC outputs
“L”. tDEALY after rising VCC,
/VDCC outputs “H” (OFF)
Below the threshold voltage, SW1
turns off and SW2 turns on. Over
the threshold voltage, SW1 turns on
and SW2 turns off.
-VDET1
Detector Threshold (falling edge
of power supply voltage)
Selecting from VDETH or VDETL
by writing to the register
(D7 in Address Fh)
Same as falling edge
( No hysteresis)
Detector Released
Voltage (rising edge of power
supply voltage)
The way to monitor
+VDET1
Always
One time every second
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 1.35v 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 1.35v
1s
VDET
←
0
7.8ms
Sampling timing for VDD
supply voltage monitor
Internal nitiali-
zation period
(1 to 2sec.)
PON
←
0
VDET
←
0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R2051K01-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051K02-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S01-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S02-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
| R2051S03-E2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:2 wire interface Real-Time Clock ICs with Battery Backup switch-over Function |
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