Kinetis MicrocontrollersのトピックK60 RTC Vbat supply https://community.nxp.com/t5/Kinetis-Microcontrollers/K60-RTC-Vbat-supply/m-p/265969#M8588 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P>we are using kinetis K60 (<SPAN style="font-size: 10pt; line-height: 1.5em;">MK60DN512VLQ10). And we would like to use now an external battery to supply the RTC. </SPAN></P><P><SPAN style="font-size: 10pt; line-height: 1.5em;">As we are working with VDD=1.8V, can the RTC work directly from a 3V battery?</SPAN></P><P><SPAN style="font-size: 10pt; line-height: 1.5em;">In the datasheet K60P144M100SF2V2, I see that VBAT operating requirements are 1.71 to 3.6V, but I don't see any restriction respect VDD, is there any?</SPAN></P><P></P><P></P><P>Thank you</P><P>best regards</P><P><SPAN class="mce_paste_marker"></SPAN></P></BODY></HTML> Wed, 20 Feb 2013 15:54:57 GMT marcosmarcoso 2013-02-20T15:54:57Z K60 RTC Vbat supply https://community.nxp.com/t5/Kinetis-Microcontrollers/K60-RTC-Vbat-supply/m-p/265969#M8588 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P></P><P>we are using kinetis K60 (<SPAN style="font-size: 10pt; line-height: 1.5em;">MK60DN512VLQ10). And we would like to use now an external battery to supply the RTC. </SPAN></P><P><SPAN style="font-size: 10pt; line-height: 1.5em;">As we are working with VDD=1.8V, can the RTC work directly from a 3V battery?</SPAN></P><P><SPAN style="font-size: 10pt; line-height: 1.5em;">In the datasheet K60P144M100SF2V2, I see that VBAT operating requirements are 1.71 to 3.6V, but I don't see any restriction respect VDD, is there any?</SPAN></P><P></P><P></P><P>Thank you</P><P>best regards</P><P><SPAN class="mce_paste_marker"></SPAN></P></BODY></HTML> Wed, 20 Feb 2013 15:54:57 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/K60-RTC-Vbat-supply/m-p/265969#M8588 marcosmarcoso 2013-02-20T15:54:57Z Re: K60 RTC Vbat supply https://community.nxp.com/t5/Kinetis-Microcontrollers/K60-RTC-Vbat-supply/m-p/265970#M8589 <HTML><HEAD></HEAD><BODY><P>Marcos,</P><P></P><P>K series products have separate VDD and VBAT domains. Both those domains support 1.71-3.6V supply ranges. The two domains can operate from independent supplies. </P><P></P><P>In summary, you can separate VBAT from VDD and operate it from a battery. :smileyhappy:</P><P></P><P>Best Regards,</P><P><BR />Eduardo</P></BODY></HTML> Fri, 22 Feb 2013 20:11:56 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/K60-RTC-Vbat-supply/m-p/265970#M8589 EMontanez 2013-02-22T20:11:56Z