AnsweredAssumed Answered

L297 L298 problem

Question asked by Cosimo Zizza on Mar 7, 2015
Latest reply on Apr 8, 2015 by Enrico Poli
Hi to all, I've build the board with L297 + L298, but I've a problem..
At the power on, with enable H, full step mode, and so on, I see the reset state of the L297 with the multimeter, that is output pins are: A = 0V B = 4.4V C = 0V D = 4.4V (0101). This is ok without the stepper connected at the L298. When I connect the stepper, the L927 output pins are: A = 3.4V B = 4.4V C = 0V D = 4.4V (?101). Output A is abnormal, and vary from 3.0V to 4.2V if I turn the trimmer in the vref pin for current control..
Someone can help me? why this? L298 may be damaged?
Thanks

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