9 / 15
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.
Notes when CR is inserted between VCC and DVI
※
Please note that there is a possibility that reset section ( 1us ) 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 = 1uF )
is used.
※
Please note that there is a possibility that Reset section (1usec) 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.)
Example of designing set when CR ( C = 1uF, R = 1k
Ω
) 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 100us or less.
②
Please wait 25ms or more after VCC turn off ( VCC <= 0.05V ), because it is necessary to secure reset section ( 1us or more ).
R1 : 1kOhm
0.1uF
C1 : 1uF
VCC
ADDR
GND
SCL
DVI
SDA
BH1715FVC
Reset Section : 1us or more
t1
VCC
DVI
2.4V
0.4V
0V
*
Please do the application design to secure Reset section 1us or more after the reclosing of the power supply.
Reset Section : 1us or more
Rise time of power supply : 100us or less
0.05V
Time to power supply reclosing : 25ms or more
VCC
DVI
2.4V
0.4V
2.8V
0V
t2
*
Please do the application design to secure Reset section 1us or more after the reclosing of the power supply.
electronic components distributor
