Range issues with TVDD set to 3.3V

[daviddevereaux]

Hello, we are having range problems with the CLEV6630B v2.0  at TVDD = 3.3V during LPCD.  Are there registers or something that we can change to improve the sensing range.  we have changed the ON and OFF time and set the I and Q thresholds to 0.  At TVDD = 3.3V we need to wipe our card on the antenna to wake it up.  At TVDD = 5V it seem to work a lot better.  

We need our product to run at 3.3V and are wondering if there are other configuration changes to be made.  

David

[weidong_sun]

Hello David,

    If TVDD=3.3v, there is no better way to improve detection range of card, see datasheet :

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To connect the CLRC663 to a Microcontroller supplied by 3.3 V, PVDD and VDD shall be at
a level of 3.3 V, TVDD can be in a range from 3.3 V to 5.0 V. A higher supply voltage at
TVDD will result in a higher field strength.

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    So if it is possible to change TVDD to 5V, do it, please!

Have a nice day!

Best Regards,

Weidong Sun