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BH1715FVC
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.
R1 : 1kOhm
BH1715FVC
VCC
SCL
0.1μF
ADDR
GND
DVI
SDA
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 occurred if recommended constant
(R1 = 1kOhm, 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
V CC
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
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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9/16
2011.11 - Rev.C
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