Can ST25R3916B produce a constant [unmodulated] NFC field without timeout?

[wrig0421]

Hello,

Can this chip produce a constant [unmodulated] NFC field without timeout?  I have a lab application where I'd like to output a constant unmodulated signal through attached NFC antenna. 

 

Based on reading the datasheet a direct command can be used to switch the AM modulation between modulated and unmodulated.  However, when looking at the NFC field on command I can't determine whether a timeout is present or not.  I want to make sure that the field can be generated constantly for my application.  

 

Please let me know.

Thanks,

Spencer

[Ulysses HERNIOSUS]

Hi, 

if the direct command enables the field (tx_en bit), then it will stay enabled until MCU turns it off.

Alternatively you could also just switch the mentioned bit but then the device will not first listen if there is an external field but unconditionally turn the field on.

Ulysses