topic Re: MPC5777M IO in MPC5xxx https://community.nxp.com/t5/MPC5xxx/MPC5777M-IO/m-p/681348#M8199 <HTML><HEAD></HEAD><BODY><P>One more thing I want to add.</P><P>Maybe it is not 100% clear from reference manual.</P><P>The device could work with IO at 3.3V, however during reset phase 0 to 3 the&nbsp; LVD400 (4V LVD) is active by default.</P><P>So if you want to run IO at 3.3V you have to start with 5V on VDD_HV_IO_MAIN and when device reach phase 3 o reset you can configure via DCF records LVD400 (turn it off). After this point you can switch to 3.3V IO supply.</P><P>Otherwise the LVD400 will keep device in reset as 3.3V will always be treated as undervoltage event by LVD400.</P><P>Peter</P></BODY></HTML> Mon, 12 Jun 2017 04:38:27 GMT petervlna 2017-06-12T04:38:27Z MPC5777M IO https://community.nxp.com/t5/MPC5xxx/MPC5777M-IO/m-p/681346#M8197 <HTML><HEAD></HEAD><BODY><P>Is it possible to supply IO with 3.3V</P></BODY></HTML> Fri, 09 Jun 2017 06:31:39 GMT https://community.nxp.com/t5/MPC5xxx/MPC5777M-IO/m-p/681346#M8197 even 2017-06-09T06:31:39Z Re: MPC5777M IO https://community.nxp.com/t5/MPC5xxx/MPC5777M-IO/m-p/681347#M8198 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>Yes, it is possible to supply VDD_HV_IO with 3.3V.</P><P>However make sure you correctly understand the voltage detectors. Especially LVD400_IM which has to be disabled in order to prevent unintended resets from LVD at 4V.</P><P>Peter</P></BODY></HTML> Sun, 11 Jun 2017 20:02:47 GMT https://community.nxp.com/t5/MPC5xxx/MPC5777M-IO/m-p/681347#M8198 petervlna 2017-06-11T20:02:47Z Re: MPC5777M IO https://community.nxp.com/t5/MPC5xxx/MPC5777M-IO/m-p/681348#M8199 <HTML><HEAD></HEAD><BODY><P>One more thing I want to add.</P><P>Maybe it is not 100% clear from reference manual.</P><P>The device could work with IO at 3.3V, however during reset phase 0 to 3 the&nbsp; LVD400 (4V LVD) is active by default.</P><P>So if you want to run IO at 3.3V you have to start with 5V on VDD_HV_IO_MAIN and when device reach phase 3 o reset you can configure via DCF records LVD400 (turn it off). After this point you can switch to 3.3V IO supply.</P><P>Otherwise the LVD400 will keep device in reset as 3.3V will always be treated as undervoltage event by LVD400.</P><P>Peter</P></BODY></HTML> Mon, 12 Jun 2017 04:38:27 GMT https://community.nxp.com/t5/MPC5xxx/MPC5777M-IO/m-p/681348#M8199 petervlna 2017-06-12T04:38:27Z