https://community.nxp.com/t5/NFC/DPC-at-Power-On-at-PN7462/m-p/1236667#M8233 <P>Hi!</P><P>I'm designing an application with the PN7462 and its DPC. Currently I have 3 gears implemented with the NFC cockpit. Using an oscilloscope and an EMVCo TestPICC I can see the gears switching up and down when changing the distance between the NFC antenna and the TestPICC. So far, so good.</P><P>However, when I switch on the field using the cockpit, I see the following waveform (on DC-Out of the TestPICC which is at z=0cm):</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="johannesdev_0-1614262410568.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/138123i75CFC91B3D700B41/image-size/medium?v=v2&amp;px=400" role="button" title="johannesdev_0-1614262410568.png" alt="johannesdev_0-1614262410568.png" /></span></P><P>It seems that the DPC starts at the lowest gear with the highest voltage, <STRONG>possibly harming the PN7462's output stage</STRONG>. Certainly, this is because I set the DPC-Control Byte (at 0x201352) to 0x13 (=Start Gear 1, DPC enabled, Gear Step 1).</P><P>When reading AN11742 it seems to me, that the DPC Control byte has to be 0x33 as I have 3 gears active. However, in this case the DPC does not work at all. Here the DPC stays at gear 0 all the time, regardless of how high the AGC-Value rises.</P><P>So how to start the DPC at gear 3 at power on? What do I get wrong?</P><P>Thank you for any help!</P> Thu, 25 Feb 2021 14:24:32 GMT johannesdev 2021-02-25T14:24:32Z https://community.nxp.com/t5/NFC/DPC-at-Power-On-at-PN7462/m-p/1236667#M8233 <P>Hi!</P><P>I'm designing an application with the PN7462 and its DPC. Currently I have 3 gears implemented with the NFC cockpit. Using an oscilloscope and an EMVCo TestPICC I can see the gears switching up and down when changing the distance between the NFC antenna and the TestPICC. So far, so good.</P><P>However, when I switch on the field using the cockpit, I see the following waveform (on DC-Out of the TestPICC which is at z=0cm):</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="johannesdev_0-1614262410568.png" style="width: 400px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/138123i75CFC91B3D700B41/image-size/medium?v=v2&amp;px=400" role="button" title="johannesdev_0-1614262410568.png" alt="johannesdev_0-1614262410568.png" /></span></P><P>It seems that the DPC starts at the lowest gear with the highest voltage, <STRONG>possibly harming the PN7462's output stage</STRONG>. Certainly, this is because I set the DPC-Control Byte (at 0x201352) to 0x13 (=Start Gear 1, DPC enabled, Gear Step 1).</P><P>When reading AN11742 it seems to me, that the DPC Control byte has to be 0x33 as I have 3 gears active. However, in this case the DPC does not work at all. Here the DPC stays at gear 0 all the time, regardless of how high the AGC-Value rises.</P><P>So how to start the DPC at gear 3 at power on? What do I get wrong?</P><P>Thank you for any help!</P> Thu, 25 Feb 2021 14:24:32 GMT https://community.nxp.com/t5/NFC/DPC-at-Power-On-at-PN7462/m-p/1236667#M8233 johannesdev 2021-02-25T14:24:32Z https://community.nxp.com/t5/NFC/DPC-at-Power-On-at-PN7462/m-p/1237244#M8238 <P>Hi!</P><P>I found the error myself: long story short: Soldering mistake!</P> Fri, 26 Feb 2021 10:42:58 GMT https://community.nxp.com/t5/NFC/DPC-at-Power-On-at-PN7462/m-p/1237244#M8238 johannesdev 2021-02-26T10:42:58Z