Pull Up Resistor

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kazemir
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Joined: Thu Mar 09, 2006 3:04 am

Pull Up Resistor

Post by kazemir »

The USB Spec states a 1.5K pull up resistor is required on D-. The IOWarrier datasheet has a sample circuit qwhich shows a 1.3K resistor....What gives? What value should I use? All other sample USB circuits I have seen use a 1.5K.

Thanks for any help,

Steve
Guido Körber
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Post by Guido Körber »

The IOW24 has an internal impedance of 200? for the Vreg output.
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