topic LPC4357: Problem with USB0 in DFU mode in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LPC4357-Problem-with-USB0-in-DFU-mode/m-p/565168#M17030 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by boscfab on Fri Nov 15 02:57:17 MST 2013</STRONG><BR /><SPAN>Hello ,</SPAN><BR /><SPAN>I'm trying to run my card with LPC4357 in BOOT mode for programming in DFU mode.</SPAN><BR /><SPAN>In my card I applied "exactly" the recommendations outlined in the document AN11392 (fig2) for USB0_VBUS, but when I turn on my card , the voltage on this pin drops to 0.4 V.</SPAN><BR /><SPAN>I tried to remove the 24k resistor .</SPAN><BR /><SPAN>I turned on the board in BOOT mode DFU , I connected the USB cable to the PC and then I connected an ammeter to measure the current that absorbs USB0_VBUS pin of the MCU.</SPAN><BR /><SPAN>In this sequence the DFU mode works correctly and I measured a current of about 3.4 mA which is absorbed by only the pin USB0_VBUS.</SPAN><BR /><SPAN>By this measure I think that the solution contained in the document AN11392 ( fig2 ) for USB0_VBUS is not correct.</SPAN><BR /><BR /><SPAN>I searched on the MCU data sheet but I have not found any indication of the minimum operating current of the pin USB0_VBUS .......</SPAN><BR /><BR /><SPAN>Does anyone have any suggestions on what I can do to fix this?</SPAN><BR /><SPAN>I have to use port USB0 only in Device mode .</SPAN><BR /><BR /><SPAN>Thank you,</SPAN><BR /><BR /><SPAN>Fabio</SPAN></BODY></HTML> Wed, 15 Jun 2016 18:49:09 GMT lpcware 2016-06-15T18:49:09Z LPC4357: Problem with USB0 in DFU mode https://community.nxp.com/t5/LPC-Microcontrollers/LPC4357-Problem-with-USB0-in-DFU-mode/m-p/565168#M17030 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by boscfab on Fri Nov 15 02:57:17 MST 2013</STRONG><BR /><SPAN>Hello ,</SPAN><BR /><SPAN>I'm trying to run my card with LPC4357 in BOOT mode for programming in DFU mode.</SPAN><BR /><SPAN>In my card I applied "exactly" the recommendations outlined in the document AN11392 (fig2) for USB0_VBUS, but when I turn on my card , the voltage on this pin drops to 0.4 V.</SPAN><BR /><SPAN>I tried to remove the 24k resistor .</SPAN><BR /><SPAN>I turned on the board in BOOT mode DFU , I connected the USB cable to the PC and then I connected an ammeter to measure the current that absorbs USB0_VBUS pin of the MCU.</SPAN><BR /><SPAN>In this sequence the DFU mode works correctly and I measured a current of about 3.4 mA which is absorbed by only the pin USB0_VBUS.</SPAN><BR /><SPAN>By this measure I think that the solution contained in the document AN11392 ( fig2 ) for USB0_VBUS is not correct.</SPAN><BR /><BR /><SPAN>I searched on the MCU data sheet but I have not found any indication of the minimum operating current of the pin USB0_VBUS .......</SPAN><BR /><BR /><SPAN>Does anyone have any suggestions on what I can do to fix this?</SPAN><BR /><SPAN>I have to use port USB0 only in Device mode .</SPAN><BR /><BR /><SPAN>Thank you,</SPAN><BR /><BR /><SPAN>Fabio</SPAN></BODY></HTML> Wed, 15 Jun 2016 18:49:09 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC4357-Problem-with-USB0-in-DFU-mode/m-p/565168#M17030 lpcware 2016-06-15T18:49:09Z