2024-06-04 05:50 AM
Hello,
Is it possible to detect a phone using NFC/RFID readers?
I am working on a wireless charger unit and trying to detect credit cards. When I put a mobile phone with a credit card, I am not able to detect credit card because phone is getting started to charge. I want to learn whether it is possible to detect phone using ST25 NFC Readers.
Is it possible to read Q value of NFC side? After we talked with the vendor of power transmitter, he suggested us to read Q value of NFC side.
2024-06-11 11:26 PM
Hi,
if tag and phone enter at the same time then RFID should detect the card and prevent Qi operation, right?
Ulysses
2024-06-11 11:31 PM
Hi Ulysses,
Yes, that's what we want to do.
2024-06-18 02:26 AM
Hi Berkay,
Are you fine with the explanations: Always perform NFC polling (rfal_cd) before Qi to avoid damage to pure NFC cards. This should also handle the case of both being brought together into the field.
BR, Ulysses
2024-06-25 07:14 AM
Hi Ulysses,
I am ok with performing NFC polling before Qi to avoid damage.
However I need a mechanism to initiate NFC polling via a phone placed on the NFC. If no RFID tag is detected, the charger should proceed to the Qi state. If I simply poll for an NFC check and then move to the Qi state, there is a risk that the charger might enter the power transfer phase before detecting an RFID card. Therefore, we need an initiator (phone detection) to start this process.
2024-06-25 11:49 PM
Hi Berkay,
Sorry but I fail to understand the scenario you are describing. Can you add some flow/sequence diagrams? Or at least a written order of actions?
BR, Ulysses