參數(shù)資料
型號(hào)： R2061K
英文描述： real-time clock ICs
中文描述： 實(shí)時(shí)時(shí)鐘IC
文件頁(yè)數(shù)： 35/48頁(yè)
文件大?。?/td> 322K
代理商： R2061K
R2061 Series
12345
Rev.1.00 - 35 -
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
tDELAY
tDELAY
ON
ON
ON
ON
ON
Same voltage level as VSB
Oscillation starting
-VDET1
I
Battery Switch Over Circuit
R2061 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
±
VDET, VSB supplies the power to VDD, and when higher
than
±
VDET, VCC supplies the power to VDD. The timing chart for VCC, VDD, and VSB is shown following.
VDD
+VDET1
VCC
VSB
(1)
(2)
(3)
(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
+VDET, VDD follows VCC voltage level.
(2) When VCC is higher than +VDET, VDD level is equal to VCC.
(3) After VCC falling beyond -VDET, VDD level is equal to VSB.
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參數(shù)描述
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R2062K01-E2 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:3 wire interface Real-Time Clock ICs with Battery Backup switch-over Function
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