topic LPC1114 GPIO voltage levels in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LPC1114-GPIO-voltage-levels/m-p/527987#M9509 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by vladimirro on Sat Jun 20 13:07:18 MST 2015</STRONG><BR /><SPAN>Hello again</SPAN><BR /><BR /><SPAN>Let me introduce another problem I faced with LPC1114.</SPAN><BR /><SPAN>I tried to implement PWM and I noticed that the low state never reached 0V. It varied from 400mV to 600mV.</SPAN><BR /><BR /><SPAN>Then I set one of the GPIO to logic low and it turned out that my uC doesn't output 0V but 0,4-0,6V...</SPAN><BR /><SPAN>I couldn't find any information about voltage levels of GPIO in LPC1114 but I guess logic low should be 0V. </SPAN><BR /><SPAN>I probed the GND pin and it is 0V.</SPAN><BR /><BR /><SPAN>What can be a reason of such behaviour? </SPAN></BODY></HTML> Wed, 15 Jun 2016 19:29:14 GMT lpcware 2016-06-15T19:29:14Z LPC1114 GPIO voltage levels https://community.nxp.com/t5/LPC-Microcontrollers/LPC1114-GPIO-voltage-levels/m-p/527987#M9509 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by vladimirro on Sat Jun 20 13:07:18 MST 2015</STRONG><BR /><SPAN>Hello again</SPAN><BR /><BR /><SPAN>Let me introduce another problem I faced with LPC1114.</SPAN><BR /><SPAN>I tried to implement PWM and I noticed that the low state never reached 0V. It varied from 400mV to 600mV.</SPAN><BR /><BR /><SPAN>Then I set one of the GPIO to logic low and it turned out that my uC doesn't output 0V but 0,4-0,6V...</SPAN><BR /><SPAN>I couldn't find any information about voltage levels of GPIO in LPC1114 but I guess logic low should be 0V. </SPAN><BR /><SPAN>I probed the GND pin and it is 0V.</SPAN><BR /><BR /><SPAN>What can be a reason of such behaviour? </SPAN></BODY></HTML> Wed, 15 Jun 2016 19:29:14 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC1114-GPIO-voltage-levels/m-p/527987#M9509 lpcware 2016-06-15T19:29:14Z Re: LPC1114 GPIO voltage levels https://community.nxp.com/t5/LPC-Microcontrollers/LPC1114-GPIO-voltage-levels/m-p/527988#M9510 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by R2D2 on Sat Jun 20 15:20:35 MST 2015</STRONG><BR /><HR /><SPAN style="color: #0000ff;"><STRONG>Quote: vladimirro</STRONG><BR />I tried to implement PWM and I noticed that the low state never reached 0V. It varied from 400mV to 600mV.<BR />...<BR />What can be a reason of such behaviour?</SPAN><HR /><BR /><BR /><SPAN>Of course you should reach nearly 0V...</SPAN><BR /><BR /><SPAN><SPAN>[img=660x397]</SPAN><A _jive_internal="true" href="https://community.nxp.com/external-link.jspa?url=http%3A%2F%2Fwww.lpcware.com%2Fsystem%2Ffiles%2FPWM_0.JPG%5B%2Fimg%5D" rel="nofollow" target="_blank">http://www.lpcware.com/system/files/PWM_0.JPG[/img]</A></SPAN><BR /><BR /><SPAN>At least if your setup is correct, nothing is connected and your measurement equipment is working... </SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 19:29:15 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC1114-GPIO-voltage-levels/m-p/527988#M9510 lpcware 2016-06-15T19:29:15Z