i.MX Processors中的主题 Latch-up performance https://community.nxp.com/t5/i-MX-Processors/Latch-up-performance/m-p/441809#M67922 <HTML><HEAD></HEAD><BODY><P>To avoid latch-up or malfunctions the I/O pins should not be externally driven while the I/O supply is OFF.</P><P>At what current do you consider an I/O pin to be driven?</P><P></P><P>Will an external 100k resistor, pulled up to external 3.3V, drive the I/O pin?</P><P></P><P>Best Regards</P><P>Claes-Henry</P></BODY></HTML> Wed, 25 Nov 2015 09:53:39 GMT claes-henryaron 2015-11-25T09:53:39Z Latch-up performance https://community.nxp.com/t5/i-MX-Processors/Latch-up-performance/m-p/441809#M67922 <HTML><HEAD></HEAD><BODY><P>To avoid latch-up or malfunctions the I/O pins should not be externally driven while the I/O supply is OFF.</P><P>At what current do you consider an I/O pin to be driven?</P><P></P><P>Will an external 100k resistor, pulled up to external 3.3V, drive the I/O pin?</P><P></P><P>Best Regards</P><P>Claes-Henry</P></BODY></HTML> Wed, 25 Nov 2015 09:53:39 GMT https://community.nxp.com/t5/i-MX-Processors/Latch-up-performance/m-p/441809#M67922 claes-henryaron 2015-11-25T09:53:39Z Re: Latch-up performance https://community.nxp.com/t5/i-MX-Processors/Latch-up-performance/m-p/441810#M67923 <HTML><HEAD></HEAD><BODY><P>Hello Claes-Henry Aronsson,</P><P></P><P>There is not a current currently specified as acceptable. As you mention the datasheet states that no I/O pin should be externally driven why the I/O supply is OFF. </P><P></P><P>I wouldn’t recommend using an external 3.3v in order to drive the I/O pin but rather using the I/O supply rail to drive it.</P></BODY></HTML> Tue, 01 Dec 2015 22:24:58 GMT https://community.nxp.com/t5/i-MX-Processors/Latch-up-performance/m-p/441810#M67923 gusarambula 2015-12-01T22:24:58Z