topic PN532 doesn't respond on SamConfiguartion in NFC https://community.nxp.com/t5/NFC/PN532-doesn-t-respond-on-SamConfiguartion/m-p/1542257#M9785 <P>Hello Everybody,<BR /><BR />I faced a problem in PN532 that after a long time (reading cards) PN532 hangs on and does not respond even to the first SamConfiguration command sent over SPI. After sending the Reset signal the situation also doesn't change.&nbsp;PN532 may start working normally after some time or after power on/off.</P><P>The schematic is as AN10609_2 recommends. And two more details - the PCB is covered with polyurethane and when we open the potting with the 35 - 40 pins, PN532 starts working normally. Also, the VBAT voltage is in the 3.2 - 3.4 V range. Could potting or voltage range be an issue?<BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="KirillT_0-1666465177239.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/197761i801081FB8AF1A6BF/image-size/medium?v=v2&amp;px=400" role="button" title="KirillT_0-1666465177239.png" alt="KirillT_0-1666465177239.png" /></span></P><P>Best regards,<BR />Kirill</P> Sat, 22 Oct 2022 19:10:42 GMT KirillT 2022-10-22T19:10:42Z PN532 doesn't respond on SamConfiguartion https://community.nxp.com/t5/NFC/PN532-doesn-t-respond-on-SamConfiguartion/m-p/1542257#M9785 <P>Hello Everybody,<BR /><BR />I faced a problem in PN532 that after a long time (reading cards) PN532 hangs on and does not respond even to the first SamConfiguration command sent over SPI. After sending the Reset signal the situation also doesn't change.&nbsp;PN532 may start working normally after some time or after power on/off.</P><P>The schematic is as AN10609_2 recommends. And two more details - the PCB is covered with polyurethane and when we open the potting with the 35 - 40 pins, PN532 starts working normally. Also, the VBAT voltage is in the 3.2 - 3.4 V range. Could potting or voltage range be an issue?<BR /><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="KirillT_0-1666465177239.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/197761i801081FB8AF1A6BF/image-size/medium?v=v2&amp;px=400" role="button" title="KirillT_0-1666465177239.png" alt="KirillT_0-1666465177239.png" /></span></P><P>Best regards,<BR />Kirill</P> Sat, 22 Oct 2022 19:10:42 GMT https://community.nxp.com/t5/NFC/PN532-doesn-t-respond-on-SamConfiguartion/m-p/1542257#M9785 KirillT 2022-10-22T19:10:42Z