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參數(shù)資料
| 型號： | R2051K01 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, QCC12 |
| 封裝： | 2 X 2 MM, 0.85 MM PITCH, ULTRA-COMPACT, FFP, 12 PIN |
| 文件頁數(shù)： | 32/53頁 |
| 文件大?。?/td> | 343K |
| 代理商： | R2051K01 |
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R2051 Series
12345
Rev.1.04
- 38 -
l
Voltage Monitoring Circuit
R2051 incorporates two kinds of voltage monitoring function. These are shown in the table below.
VCC Voltage Monitoring Circuit
VDD Voltage Monitoring Circuit
(VDET)
Purpose
CPU reset output
Back-up battery checker
Monitoring supply voltage
VCC pin
VDD pin (supply voltage for the
internal RTC circuit)
Output for result
/VDCC pin
Store in the Control Register 2
(D6 in Address Fh)
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.
Detector Threshold (falling edge
of power supply voltage)
-VDET1
Selecting from VDETH or VDETL
by writing to the register
(D7 in Address Fh)
Detector Released
Voltage (rising edge of power
supply voltage)
+VDET1
Same as falling edge
( No hysteresis)
The way to monitor
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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| 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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