Hello,
we have a PN512 chip for read the NFC tags on a device that we acquire from an our partner. I don0't have the schematics but i have done a short reverse engineering. We have some problems on the RX circuit, many time the card is not correctly readed.
I have seen on different application note that the rx circuit for the PN512 is proposed in two different ways:
in our case the circuit implemented is the circuit 3. If i switch from the circuit 3 to the circuit 1 (inverting R1 with C3) the reader seems to work better.
What are the difference between the two circuit? Which is the best? or are equivalent?
Thanks
Solved! Go to Solution.
Hello @dc1 ,
Thanks for your information.
The principle of receiver circuit please kindly refer to 4.6 Receiver circuit design of AN1445.
circuit 3 and 2 are the reference design. circuit 1 is the design of the development board which is verified by NXP. So we recommend the customer to follow the design if have the same antenna size.
Have a nice day.
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Hello @dc1 ,
Thanks for your information.
The principle of receiver circuit please kindly refer to 4.6 Receiver circuit design of AN1445.
circuit 3 and 2 are the reference design. circuit 1 is the design of the development board which is verified by NXP. So we recommend the customer to follow the design if have the same antenna size.
Have a nice day.
-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!
- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
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