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BH1721FVC
Technical Note
ex 4) LPF using CR is inserted between VCC and DVI.
This method has the possibility that the Reset section of turning on the power supply can not satisfied. Cannot be
satisfied. Please design the set considering the characteristic of the power supply enough.
BH1721FVC
R1 : 1k Ω
0.1μF
VCC SCL
GND
SDA 0.1μF DVI
C1 : 1μF
◆ Notes when CR is inserted between VCC and DVI
※ Please note that there is a possibility that reset section ( 1μs ) can not be satisfied because the power supply is turned on when the rise time of VCC is slow
※ When VCC is turned off, the DVI voltage becomes higher than VCC voltage but IC destruction is not occred if recommended constant
( R1 = 1k Ω , C1 = 1μF ) is used.
※ Please note that there is a possibility that Reset section (1μsec) cannot be satisfied if wait time is not enough long after turning off VCC.
(It is necessary to consider DVI voltage level after turning off VCC.)
t1
t2
VCC
DVI
2.4V
0.4V
0V
Reset Section: 1μs or more
* Please do the application design to secure Reset section 1μs or more after the reclosing of the power supply.
◆ Example of designing set when CR ( C = 1μF, R = 1k ? ) is inserted between VCC and DVI with VCC=2.8V
① The rise time to 0 → 2.4V of VCC must use the power supply of 100μs or less.
② Please wait 25ms or more after VCC turn off ( VCC <= 0.05V ), because it is necessary to secure reset section
(1μs or more).
Rise time of power supply: 100μs or less
2.8V
Time to power supply reclosing: 25ms or more
2.4V
0.4V
VCC
DVI
0V
0V
0.05V
Reset Section: 1μs or more
* Please do the application design to secure Reset section 1μs or more after the reclosing of the power supply.
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? 2011 ROHM Co., Ltd. All rights reserved.
9/15
2011.11 - Rev.B
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