clrc66303 LPCD feature range

[michalbogdziewicz]

Hi,

We are currently working with the CLRC66303 and using the LPCD feature. We are experiencing difficulties achieving an acceptable detection range when the LPCD threshold is set greater than 0.

When the LPCD threshold is set to 0, detection range is acceptable and the system works as expected.

When the threshold is set to 1 or higher, the detection range decreases significantly and becomes unusable for our application.

We are concerned whether using a threshold value of 0 is recommended for production use.
We are also concerned about the potential increase in false wake-ups when using threshold = 0.

We have tried the following to improve detection range:
- Enabling LPCD_TX_HIGH
- Enabling LPCD_FILTER
However, these changes resulted only in marginal improvement.

We’re using development kit and the NFC GUI tool.


Is setting the LPCD threshold to 0 a supported and recommended configuration for production systems?
Are there recommended register settings or tuning procedures to improve LPCD detection range while keeping threshold >= 1?
Are there antenna tuning or hardware considerations specifically critical for LPCD performance with CLRC66303?
Any guidance or best practices for achieving reliable LPCD detection with improved range would be appreciated.

Best regards

[andreaslolle]

Hi EduardoZamora at NXP TechSupport. Thanks for the answer. We're working with Michael on project outlined above. We are only able to achieve less than half the wake up distance listed in table 4 with the CLRC663 Eval Board (and get similar poor results with our own PCBA design)

We are specifically using the NFC cockpit to configure IC settings on the CLRC663 Eval Board.

Should this approach work or are there specific registers that we need to pay special attention to for us to get similar LPCD detection range as listed in table 4?

Thanks in advance,

[EduardoZamora]

Hello @michalbogdziewicz

Hope you are doing well.

Please consider that the default antenna of CLRC663 Evaluation Board has some metal layer inside the antenna area; this antenna is not an optimum antenna as such. Also, it is recommended using external power supply instead of USB supply for a better performance.

The behavior of detection range may depend on some other configurations. Please refer to AN11783 CLRC663 plus Low Power Card Detection, Chapter 3, for more information on available configurations around Threshold value. Some results on CLRC663 Eval Board are shown in Table 4.

Regards,
Eduardo.