voltage difference between pin1 and pin37

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gsolovey
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Joined: Wed Jul 29, 2009 7:03 pm
Location: Buenos Aires

voltage difference between pin1 and pin37

Post by gsolovey »

We would like to use Pin01 (Trigger input 1) in the USB interface to acquire a sync signal from an external electronic circuit. We have found a voltage difference of 3 V between pin01 and pin37 (ground). Is that difference ok? Shouldn't that difference be zero when unplugged?
Thanks!
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Coen
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Post by Coen »

It's normal, the measured 3V is due to the internal pull-up resistors (10 kOhm to 5V). The inputs are pulled high when left unconnected.

Best regards, Coen (BioSemi)
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