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STEVAL-25R3916B: Reader/Writer demo fails multi-tag detection (2cm & 10cm), but works correctly in USB mode

Likhitha
Visitor

‎2025-12-01 5:19 PM

Hi Team,

I am working with the STEVAL-D25R16B kit and have encountered a critical discrepancy in detection range between the embedded "Reader/Writer" demonstration and the PC-based USB mode.

Here are the test results using ISO15693 tags:

The Setup:

  • Tag A: Placed at 2 cm (Near)

  • Tag B: Placed at 10 cm (Far)

1. Testing in USB Mode (PC GUI):

  • Result: SUCCESS.

  • The reader successfully detects both Tag A (2cm) and Tag B (10cm).

2. Testing in Standalone "Reader/Writer" Demo:

  • Result: FAILURE.

  • The reader detects Tag A, but fails to detect Tag B at 10cm.

  • Tag B is only detected if moved closer to 5 cm.

Question: Could you please clarify which specific settings (Receiver Gain, Auto-Antenna Tuning, or Device Limits) differ between the USB GUI and the Example Firmware? We need to replicate the superior performance of the USB mode in the Reader/Writer.

Thanks,

Likhitha

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