參數(shù)資料
型號(hào)： R2051K01
廠商： RICOH COMPANY LTD
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)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(yè)數(shù)： 33/53頁(yè)
文件大?。?/td> 343K
代理商： R2051K01
R2051 Series
12345
Rev.1.04
- 39 -
The VCC supply voltage monitor circuit operates always. When VCC rising over +VDET1, SW1 turns on, and SW2
turns off.
And tDELAY after rising VCC, /VDCC outputs OFF(H).
But when oscillation is halt, VCC outputs
OFF(H) tDELAY after oscillation starting. When VCC falling beyond -VDET1, SW1 turns off, and SW2 turns on.
And /VDCC outputs “L”.
VDD
32768Hz Oscillation
/VDCC
+VDET1
VCC
SW1
SW2
tDELAY
ON
Same voltage level as VSB
Oscillation starting
-VDET1
n Battery Switch Over Circuit
R2051 incorporates three power supply pins, VDD, VCC, and VSB. VDD pin is the power supply pin for internal
real time clock circuit. When VCC voltage is lower than
±VDET1, VSB supplies the power to VDD, and when
higher than
±VDET1, VCC supplies the power to VDD. The timing chart for VCC, VDD, and VSB is shown
following.
VDD
+VDET1
VCC
VSB
(1)
(2)
(3)
(2)
-VDET1
(1) When VSB is 0v and VCC is rising from 0v, VDD follows half of VCC voltage level. After VCC rising over
+VDET1, VDD follows VCC voltage level.
(2) When VCC is higher than +VDET1, VDD level is equal to VCC.
(3) After VCC falling beyond -VDET1, VDD level is equal to VSB.
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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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