Hello Everibody,
I have a question concern the ISO1176T.
I build a test circuit equal to the Eval-Board for this chip. First i wont to buy this Board, but it was selled out in Germany.
The Problem is, there is no Signal on the Bus lines A and B.
The Circuit is like the scheme in this Post. The only differences to the Test-board from TI is that i dont use the transformamator,
for the first Tests the busside ground is like the normal ground and Vcc2 comes from a LDO with Vout = 3,3 V.
The input signal to DIN is square, 3,3 VDC with 1,5 V Offset. Vcc1 = 5 V.
So I switched DE to High, and RE* to HIGH but there is no Output signal.
Confusing is that if ISODE is on HIGH, there is a output signal (i know, ISODE is a output).
I tried to change the resistors between A and B from 54 to 120 Ohm and insert R from A to + (620 Ohm) and from B to - (620 Ohm),
but nothing helps. So whats wrong?
with kind regard, Dirk
ISO1176_schaltplan_test1.pdf7573.ISO1176_schaltplan_test1.pdf
