topic Re: NXP RFID-Card RC663 and Distance in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/NXP-RFID-Card-RC663-and-Distance/m-p/522339#M4975 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Sergio29 on Sun Dec 07 23:37:10 MST 2014</STRONG><BR /><SPAN>Hi t9cpu</SPAN><BR /><BR /><BR /><SPAN>You are right</SPAN><BR /><BR /><SPAN>Today, always waiting for NXP help and solutions, I think what LPCD function on MFRC630 or CLRC663 NXP Mifare component is virtually unusable for using it in low power with non-rechargeable batteries.</SPAN><BR /><SPAN>I think it's the only&nbsp; reason to use LPCD function, is'nt it ?</SPAN><BR /><SPAN> </SPAN><BR /><BR /><SPAN>A lot of parameters make it to fail (such has temperature variation)</SPAN><BR /><BR /><SPAN>6 month ago I start working on those problems and today I haven't found a really good solution.</SPAN><BR /><BR /><STRONG>I contact NXP via EBV for this problems 5 months ago with all explanations and I have transmit&nbsp;&nbsp; my schematic and board design with only this answer "All works fine, no one experiencing this problem" !!!!!</STRONG><BR /><BR /><SPAN>You can just verify this problems with the red evaluation board !</SPAN><BR /><SPAN>Sometimes it detect without card presence</SPAN><BR /><SPAN>Sometime at 1 cm</SPAN><BR /><SPAN>Sometime at 2 cms</SPAN><BR /><SPAN>Sometime there is no more detection</SPAN><BR /><BR /><SPAN>It's changing day to day.</SPAN><BR /><BR /><SPAN>Try to reduce Rxp ans Rxn resistor in your design, I decrease it from 15k Ohm to 10K or 8K for better results</SPAN><BR /><SPAN>(Always assuming that&nbsp; RXp and RXp does not exceed max level) </SPAN><BR /><SPAN>But variations of card detection stay here...</SPAN><BR /><BR /><SPAN>What board do you use ? </SPAN><BR /><SPAN>Can you send to me your documentation if it's your own design board, I will do it too if you want.</SPAN><BR /><BR /><SPAN>If you plan tu use LPCD using non-rechargeable batteries, keep in mind that erronous detection will use&nbsp; 80 to 100 ma on power supply during Request command (40ms) to verify presence of the card !</SPAN><BR /><SPAN>I have used software solution to resolve this other problem but it's not really the good solution...</SPAN><BR /><BR /><SPAN>Exepted the LPCD function, this component works very fine</SPAN><BR /><BR /><SPAN>Happy to read you</SPAN><BR /><BR /><SPAN>Serge</SPAN><BR /><BR /><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 16:39:52 GMT lpcware 2016-06-15T16:39:52Z NXP RFID-Card RC663 and Distance https://community.nxp.com/t5/LPC-Microcontrollers/NXP-RFID-Card-RC663-and-Distance/m-p/522338#M4974 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by t9cpu on Mon Jul 21 00:09:06 MST 2014</STRONG><BR /><SPAN>Hello !</SPAN><BR /><BR /><SPAN>If this is not the right place sorry... but maybe someone can help me.</SPAN><BR /><SPAN>I have the NXP RC663 RFID Card and the Antenna is now OK. The Smith-Diagramm shows me I'm near the Point 1 and the Swr shows me a relation from 1.1:1. So I think this is OK. To read the UID is no Problem from a distance like 3 cm. But the LPCD-detection is not very well. A distance from 2-3mm is necessary to detect a card. And also not every time a card is detected. </SPAN><BR /><SPAN>Is there someone who has experience with it and can help me ?</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 16:39:51 GMT https://community.nxp.com/t5/LPC-Microcontrollers/NXP-RFID-Card-RC663-and-Distance/m-p/522338#M4974 lpcware 2016-06-15T16:39:51Z Re: NXP RFID-Card RC663 and Distance https://community.nxp.com/t5/LPC-Microcontrollers/NXP-RFID-Card-RC663-and-Distance/m-p/522339#M4975 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Sergio29 on Sun Dec 07 23:37:10 MST 2014</STRONG><BR /><SPAN>Hi t9cpu</SPAN><BR /><BR /><BR /><SPAN>You are right</SPAN><BR /><BR /><SPAN>Today, always waiting for NXP help and solutions, I think what LPCD function on MFRC630 or CLRC663 NXP Mifare component is virtually unusable for using it in low power with non-rechargeable batteries.</SPAN><BR /><SPAN>I think it's the only&nbsp; reason to use LPCD function, is'nt it ?</SPAN><BR /><SPAN> </SPAN><BR /><BR /><SPAN>A lot of parameters make it to fail (such has temperature variation)</SPAN><BR /><BR /><SPAN>6 month ago I start working on those problems and today I haven't found a really good solution.</SPAN><BR /><BR /><STRONG>I contact NXP via EBV for this problems 5 months ago with all explanations and I have transmit&nbsp;&nbsp; my schematic and board design with only this answer "All works fine, no one experiencing this problem" !!!!!</STRONG><BR /><BR /><SPAN>You can just verify this problems with the red evaluation board !</SPAN><BR /><SPAN>Sometimes it detect without card presence</SPAN><BR /><SPAN>Sometime at 1 cm</SPAN><BR /><SPAN>Sometime at 2 cms</SPAN><BR /><SPAN>Sometime there is no more detection</SPAN><BR /><BR /><SPAN>It's changing day to day.</SPAN><BR /><BR /><SPAN>Try to reduce Rxp ans Rxn resistor in your design, I decrease it from 15k Ohm to 10K or 8K for better results</SPAN><BR /><SPAN>(Always assuming that&nbsp; RXp and RXp does not exceed max level) </SPAN><BR /><SPAN>But variations of card detection stay here...</SPAN><BR /><BR /><SPAN>What board do you use ? </SPAN><BR /><SPAN>Can you send to me your documentation if it's your own design board, I will do it too if you want.</SPAN><BR /><BR /><SPAN>If you plan tu use LPCD using non-rechargeable batteries, keep in mind that erronous detection will use&nbsp; 80 to 100 ma on power supply during Request command (40ms) to verify presence of the card !</SPAN><BR /><SPAN>I have used software solution to resolve this other problem but it's not really the good solution...</SPAN><BR /><BR /><SPAN>Exepted the LPCD function, this component works very fine</SPAN><BR /><BR /><SPAN>Happy to read you</SPAN><BR /><BR /><SPAN>Serge</SPAN><BR /><BR /><BR /><BR /></BODY></HTML> Wed, 15 Jun 2016 16:39:52 GMT https://community.nxp.com/t5/LPC-Microcontrollers/NXP-RFID-Card-RC663-and-Distance/m-p/522339#M4975 lpcware 2016-06-15T16:39:52Z