Hi everyone,
I hope you're all doing well!
I’ve designed a custom board based on the OM27160A1 reference design and connected it to an ESP32-C6. I’ve recently assembled the board and am now trying to work with the PN7161. Unfortunately, I’m already struggling to read the I2C address, and I’m unsure what might be causing the issue.
I’m wondering if something might have gone wrong during the soldering process, or if there’s an issue with my schematic design from the start. To troubleshoot, I’ve included only the reader-relevant portion of my schematic in the attached images.
I would greatly appreciate it if someone could kindly review my schematic and let me know if anything looks off. I’m open to any suggestions or feedback to help me get the PN7161 up and running.
Thank you so much in advance for your help!
Best regards,
Alexander
Hello, Good Day!
Thank you very much for your interest in our products.
Please consider that the OM2716A1HN evaluation board is not a Reference Design and is not intended to represent a final design recommendation for any particular application. The proper functionality of a final device heavily depends on proper printed-circuit board layout and heat sinking design as well as attention to supply filtering, transient suppression, and I/O signal quality.
With that taken into account I would like to point out some differences that were found between the documented design and the design that you shared with us.
- As already mentioned, VDD(PAD) is connected to a cap that is connected to 3.3v. Should be connected to a grounded cap, and connected directly to VDD(PAD)
- Same thing happens with VDD(UP) as it should be connected to grounded cap, and connected directly to VDD(UP) as follows:
- You could consider adding a 10k Resistor form DWL_REQ to GND to ensure the logic state of the pin.
- C16 has a value of 0.1uF when in the EVK schematic that capacitor has a value of 4.7uF
- Please check with the XTAL manufacturer that it has everything it needs to work properly and confirm that it meets the specs of our recommended hardware.
- It is also, important to point out that resistors R8, R9, R10, R11 are well connected in the schematic, but should not all be placed during assembly of the board given that they interfere in the I2C address selection of the reader. In order to meet the proper range of valid addresses, the resistors should be connected (on the PCB) as follows:
R10 is equal to custom R10
R11 is equal to custom R11
R12 is equal to custom R8
R13 is equal to custom R9
Please refer to PN7160 Hardware Design Guide to find out more about recommended hardware specifications. I would also recommend checking out OM27160 User Manual to get a deeper understanding on how the Evaluation Board works, its possible hardware modifications and how this interacts with the signals.
If you continue having trouble reading NFC cards, please make sure you stick to the PN7160 antenna design and matching guide specifications, since hardware variations can interfere with the proper functionality of the antenna. Also, consider checking out some of the NFC Antenna Design training videos that we offer publicly, as well as the AN11535 Application Note on the use of a Vector Network Analyzer (VNA) which is required for proper antenna tuning.
Unfortunately we may not be able to provide further support regarding the software you are using, as we limit the support scope to our recommended libraries, some of which can be downloaded from https://www.nxp.com/doc/SW6705 and easily ported to any other host providing I2C communication as described in NXP-NCI2.0 MCUXpresso examples guide, although keep in mind that porting to third-party platforms is out of our support scope.
My best regards,
Daniel.
Hello, Good Day!
Thank you very much for your interest in our products.
Please consider that the OM2716A1HN evaluation board is not a Reference Design and is not intended to represent a final design recommendation for any particular application. The proper functionality of a final device heavily depends on proper printed-circuit board layout and heat sinking design as well as attention to supply filtering, transient suppression, and I/O signal quality.
With that taken into account I would like to point out some differences that were found between the documented design and the design that you shared with us.
- As already mentioned, VDD(PAD) is connected to a cap that is connected to 3.3v. Should be connected to a grounded cap, and connected directly to VDD(PAD)
- Same thing happens with VDD(UP) as it should be connected to grounded cap, and connected directly to VDD(UP) as follows:
- You could consider adding a 10k Resistor form DWL_REQ to GND to ensure the logic state of the pin.
- C16 has a value of 0.1uF when in the EVK schematic that capacitor has a value of 4.7uF
- Please check with the XTAL manufacturer that it has everything it needs to work properly and confirm that it meets the specs of our recommended hardware.
- It is also, important to point out that resistors R8, R9, R10, R11 are well connected in the schematic, but should not all be placed during assembly of the board given that they interfere in the I2C address selection of the reader. In order to meet the proper range of valid addresses, the resistors should be connected (on the PCB) as follows:
R10 is equal to custom R10
R11 is equal to custom R11
R12 is equal to custom R8
R13 is equal to custom R9
Please refer to PN7160 Hardware Design Guide to find out more about recommended hardware specifications. I would also recommend checking out OM27160 User Manual to get a deeper understanding on how the Evaluation Board works, its possible hardware modifications and how this interacts with the signals.
If you continue having trouble reading NFC cards, please make sure you stick to the PN7160 antenna design and matching guide specifications, since hardware variations can interfere with the proper functionality of the antenna. Also, consider checking out some of the NFC Antenna Design training videos that we offer publicly, as well as the AN11535 Application Note on the use of a Vector Network Analyzer (VNA) which is required for proper antenna tuning.
Unfortunately we may not be able to provide further support regarding the software you are using, as we limit the support scope to our recommended libraries, some of which can be downloaded from https://www.nxp.com/doc/SW6705 and easily ported to any other host providing I2C communication as described in NXP-NCI2.0 MCUXpresso examples guide, although keep in mind that porting to third-party platforms is out of our support scope.
My best regards,
Daniel.
