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Why the STM3210B-EVAL use two NPN to control the 1.5k pull up resistor of USB?

mcuisp
Associate II

‎2009-02-09 01:36 AM

Posted on February 09, 2009 at 10:36

Why the STM3210B-EVAL use two NPN to control the 1.5k pull up resistor of USB?

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mcuisp
Associate II

‎2011-05-17 04:02 AM

Posted on May 17, 2011 at 13:02

Why not use only a 5V FT IO to control.

Pls see the attachments for circuit diagram.

[ This message was edited by: mcuisp on 09-02-2009 18:12 ]

[ This message was edited by: mcuisp on 09-02-2009 18:13 ]

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