Wireless MCUのトピックRe: NFC NHS3152 https://community.nxp.com/t5/Wireless-MCU/NFC-NHS3152/m-p/967133#M7982 <HTML><HEAD></HEAD><BODY><P><SPAN style="font-size: 10.5pt; color: #2b2e2f;">Hi Kees,</SPAN></P><P></P><P><SPAN style="font-size: 10.5pt; color: #2b2e2f;">The NHS3152 is an NFC transponder, it has no reader capability. Therefore no EMC filter is necessary on the LA/LB pins.</SPAN></P><P><SPAN style="font-size: 10.5pt; color: #2b2e2f;"><BR /> The internal chip capacitance at the antenna inputs is 50pF. The impedance of the antenna should be such that is resonates slightly above 13.56MHz. This can be achieved by careful matching of the antenna inductance or in case of a too low inductance by adding an external capacitor across the antenna (pF range).<BR /> Please look at the&nbsp;<A href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcommunity.nxp.com%2Fdocs%2FDOC-341105&amp;data=02%7C01%7Cmario.ignacio.castaneda.lopez%40nxp.com%7C47960b96c9594350a37708d7426b5043%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637050900987800297&amp;sdata=bGldG4AwP6Sj%2FxGwvInm9d5ks4I25695OACWewNmxIU%3D&amp;reserved=0">https://community.nxp.com/docs/DOC-341105</A> for a nice explanation of the antenna design process.<BR /> <BR /> Passive programming of the firmware of the NHS3152 is not supported.</SPAN></P><P></P><P><SPAN style="font-size: 10.5pt; color: #2b2e2f;">Regards,</SPAN></P><P><SPAN style="font-size: 10.5pt; color: #2b2e2f;">Mario</SPAN></P></BODY></HTML> Thu, 26 Sep 2019 15:24:27 GMT mario_castaneda 2019-09-26T15:24:27Z NFC NHS3152 https://community.nxp.com/t5/Wireless-MCU/NFC-NHS3152/m-p/967132#M7981 <HTML><HEAD></HEAD><BODY><P>#</P><P>What is the NFC load impedance of the NHS3152? 20 or 80 ohm</P><P>Is there a EMC filter inside the NHS3152 chip ?&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; What is the Copt matching capacitor&nbsp; ?&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Is total capacitance&nbsp; 50 pf + Copt ?&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Can you give some guideline to match the NFC antenna</P><P></P><P>Greetings Kees de Haan</P></BODY></HTML> Thu, 08 Aug 2019 12:30:44 GMT https://community.nxp.com/t5/Wireless-MCU/NFC-NHS3152/m-p/967132#M7981 keesdehaan 2019-08-08T12:30:44Z Re: NFC NHS3152 https://community.nxp.com/t5/Wireless-MCU/NFC-NHS3152/m-p/967133#M7982 <HTML><HEAD></HEAD><BODY><P><SPAN style="font-size: 10.5pt; color: #2b2e2f;">Hi Kees,</SPAN></P><P></P><P><SPAN style="font-size: 10.5pt; color: #2b2e2f;">The NHS3152 is an NFC transponder, it has no reader capability. Therefore no EMC filter is necessary on the LA/LB pins.</SPAN></P><P><SPAN style="font-size: 10.5pt; color: #2b2e2f;"><BR /> The internal chip capacitance at the antenna inputs is 50pF. The impedance of the antenna should be such that is resonates slightly above 13.56MHz. This can be achieved by careful matching of the antenna inductance or in case of a too low inductance by adding an external capacitor across the antenna (pF range).<BR /> Please look at the&nbsp;<A href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fcommunity.nxp.com%2Fdocs%2FDOC-341105&amp;data=02%7C01%7Cmario.ignacio.castaneda.lopez%40nxp.com%7C47960b96c9594350a37708d7426b5043%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637050900987800297&amp;sdata=bGldG4AwP6Sj%2FxGwvInm9d5ks4I25695OACWewNmxIU%3D&amp;reserved=0">https://community.nxp.com/docs/DOC-341105</A> for a nice explanation of the antenna design process.<BR /> <BR /> Passive programming of the firmware of the NHS3152 is not supported.</SPAN></P><P></P><P><SPAN style="font-size: 10.5pt; color: #2b2e2f;">Regards,</SPAN></P><P><SPAN style="font-size: 10.5pt; color: #2b2e2f;">Mario</SPAN></P></BODY></HTML> Thu, 26 Sep 2019 15:24:27 GMT https://community.nxp.com/t5/Wireless-MCU/NFC-NHS3152/m-p/967133#M7982 mario_castaneda 2019-09-26T15:24:27Z