Kinetis MicrocontrollersのトピックRe: KL25Z USB artifact issue https://community.nxp.com/t5/Kinetis-Microcontrollers/KL25Z-USB-artifact-issue/m-p/624538#M37420 <HTML><HEAD></HEAD><BODY><P>Hi Karolina</P><P></P><P>I assume that you are using a Rev-D right? The temporarily drop of supply voltage is caused by a diode.</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.jpg"><img src="https://community.nxp.com/t5/image/serverpage/image-id/14902iEA5F4BDB80F10EDE/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.jpg" alt="pastedImage_1.jpg" /></span></P><P>While you are supplying with P5_9V_Vin there is not diode, but when you connect USB to OpenSDA and it supply power to the system, you have a diode that cause a temporary drops of voltage. If you check schematic od Rev-E or F there is a diode in P5-9V_VIN. Also I have made a test of this and it only occurs in Rev-E schematic.</P><P><BR />Hope this information helps you<BR />Have a great day,<BR />Jorge Alcala</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Fri, 17 Feb 2017 04:58:12 GMT jorge_a_vazquez 2017-02-17T04:58:12Z KL25Z USB artifact issue https://community.nxp.com/t5/Kinetis-Microcontrollers/KL25Z-USB-artifact-issue/m-p/624537#M37419 <HTML><HEAD></HEAD><BODY><P>Hi, I have FRDM KL25Z connected to expansion board FXS MULT2-B and together powered by battery. On KL25Z, I switched on LED diode (LED diode lights) . But when i connect usb to PC (or unconnected from PC) , the diode blinks once (caused by supply voltage temporarily drops from 3.3V to 1V, and then stabilizes at 3.1 V again). It is caused by time delay beetwen power supply from PC and battery power supply (or opposite way). I need eliminate this artifact or at least reduce. Knows someone, how to solve it? Thank you very much.kl25z&nbsp;frdm-fxs-mult2-b&nbsp;usb‌&nbsp;artefacts</P></BODY></HTML> Sat, 11 Feb 2017 11:24:02 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/KL25Z-USB-artifact-issue/m-p/624537#M37419 karolina92 2017-02-11T11:24:02Z Re: KL25Z USB artifact issue https://community.nxp.com/t5/Kinetis-Microcontrollers/KL25Z-USB-artifact-issue/m-p/624538#M37420 <HTML><HEAD></HEAD><BODY><P>Hi Karolina</P><P></P><P>I assume that you are using a Rev-D right? The temporarily drop of supply voltage is caused by a diode.</P><P><span class="lia-inline-image-display-wrapper" image-alt="pastedImage_1.jpg"><img src="https://community.nxp.com/t5/image/serverpage/image-id/14902iEA5F4BDB80F10EDE/image-size/large?v=v2&amp;px=999" role="button" title="pastedImage_1.jpg" alt="pastedImage_1.jpg" /></span></P><P>While you are supplying with P5_9V_Vin there is not diode, but when you connect USB to OpenSDA and it supply power to the system, you have a diode that cause a temporary drops of voltage. If you check schematic od Rev-E or F there is a diode in P5-9V_VIN. Also I have made a test of this and it only occurs in Rev-E schematic.</P><P><BR />Hope this information helps you<BR />Have a great day,<BR />Jorge Alcala</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Fri, 17 Feb 2017 04:58:12 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/KL25Z-USB-artifact-issue/m-p/624538#M37420 jorge_a_vazquez 2017-02-17T04:58:12Z