Hi,
I made a custom board of the PN532 based on the Adafruit PN532 board.
I'm having trouble initializing the chip. The VCC supply, which is an output from the chip, is zero and I can't find the error causing this.
I am powering the chip with 3.3 V on both VBat and PVDD.
I don't know if you guys know why this might happen, thank you very much in advance.
Hello @JonConesa
Hope you are doing well.
Please, consider that PN532 is Not Recommended for New Designs and our support may be limited; for new designs we recommend using PN7160 instead.
I will recommend you referring to PN532 Data Sheet. Section 13 shows an application diagram of PN532 that you could use as a reference. PN532 demoboard App Note includes an electrical diagram of an old demo board based on this device; you could use it as a reference.
Also, perhaps you could confirm the voltage in PVDD, VBAT, DDD, AVDD and TVDD pins by using an oscilloscope and compare with the timing for reset depicted in Section 12.3.
Additionally, I will recommend you consulting the Antenna design guide for MFRC52x, PN51x, PN53x to achieve a proper antenna design.
Regards,
Eduardo.