S i 8 4 x x I S O - E V B U G
Rev. 0.3
7
3.2. I
2
C Isolator Considerations
After power has been supplied to the board, connect a digital square wave input (5 Vpeak max, with desired clock
frequency up to 1.7 MHz) to the desired input channel. The Si8400 I
2
C isolator has 1 k
pull-up resistors already
installed. If these resistors are redundant with another board that is being used to evaluate the Si8400, the user
should remove the redundant pull-up resistors to accommodate adequate drive current for the test being
performed. Moreover, note that the Si8463 can be replaced with an Si8405 (Bidirectional I
2
C Isolator with two
unidirectional digital channels). Pull-up resistors of 1 k
are already installed to accommodate the Si8405’s
evaluation. Pull-up jumpers J1, J2, J3, and J4 need to be installed to evaluate the Si8405. They will need to be
removed or not installed (default from factory) to evaluate the Si8463.
Figure 6 illustrates Side B Pulling Up, with Side A following for the Si8400. The Si8400 was powered from 5 V on
both sides with a 100 kHz input test signal.
Figure 6. Side B Pulling Up, Side A Following
Note:
The test points in front of each device have 1 mm spacing. If desired, the test points can be replaced with a 1 mm
spacing terminal block to assist in evaluation.
