2018-02-16 04:32 PM
Thanks.
Solved! Go to Solution.
2018-03-06 05:14 AM
Hi Joseph,
The ST25R3911B has some features build in to overcome environmental changes in wake-up mode.
Automatic Averaging for example can be used to filter slow changing effects like temperature change or changing humidity. Only 'fast' changes like detuning by a tag or phone will be recognized.
The delta-window is another setting that changes the sensitivity of the wake-up feature. It allows to set a range around the reference value, where no interrupt is triggered.
An interrupt can also be triggered by another device which operates at the same frequency range. A BLE or WIFI device is too different in terms of frequency to generate an amplitude change on the IC's input pins. A phone which also sends out actively an HF field @ 13.56MHz will interfere with the inductive wake-up pulse and therefore also trigger an interrupt when being active in closer proximity.
BR Travis
2018-02-19 01:42 AM
Hi Joseph,
I beleive that all the readers are ready to detect a tag with a quarter size of a credit card form factor with an antenna tuned according to NFC/RFID standart/norma. Which type of pair Reader /Tag do you refer to?You second point is a bit generic can you please clarify your request and your setup?Thank2018-02-28 02:16 PM
Hi Peter,
Thanks for the reply. I have the ST25R3911B-DISCO and X-NUCLEO-NFC05A1 boards. I will experiment with different setup. The GUI is also useful.
2018-03-06 05:14 AM
Hi Joseph,
The ST25R3911B has some features build in to overcome environmental changes in wake-up mode.
Automatic Averaging for example can be used to filter slow changing effects like temperature change or changing humidity. Only 'fast' changes like detuning by a tag or phone will be recognized.
The delta-window is another setting that changes the sensitivity of the wake-up feature. It allows to set a range around the reference value, where no interrupt is triggered.
An interrupt can also be triggered by another device which operates at the same frequency range. A BLE or WIFI device is too different in terms of frequency to generate an amplitude change on the IC's input pins. A phone which also sends out actively an HF field @ 13.56MHz will interfere with the inductive wake-up pulse and therefore also trigger an interrupt when being active in closer proximity.
BR Travis