Part Number: ISO1540
We are trying to isolate the EV2300 SMBus by using the ISO1540. The circuit implemented is identical to the one in the ISO1540 datasheet (page 24). One side of the IC is being powered via the EV2300 board itself, whilst the other with an external 3.3 V supply. The problem is that no output is being observed on the ISO1540 when the EV2300 is transmitting. These is what we have done so far:
1) Tested the circuit with a function generator at the clock frequency of the EV2300. This worked perfectly.
2) Inserted a buffer between the EV2300 and the ISO1540. This also worked perfectly, but at the cost of bi-directional communication (which is useless).
The problem seems to arise when the EV2300 is connected directly to the ISO1540 (with the circuit explained above). Can you point me to the source of this problem and perhaps suggest a solution?
Thank you and regards,
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In reply to Koteshwar Rao:
Hi, thank you for your reply.
1. I am using the EV2300 on Windows XP and do not own a EV2400. I can confirm that both the clock and data are present at the pins, checked with an oscilloscope. 2. EV2300 is connected to side 2 of the ISO1540. The other side is connected to a BQ2084 chip. 3. I am using the VCC (3.3V) pin to power the ISO1540 on side 2. 4. I applied the clock to side 2, on both data and clock pins. The output was monitored on side 1 - with an oscilloscope. Thank you again. Regards, Daniel
In reply to Daniel Cumbo:
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