Manufacturing considerations¶
Crystal trimming¶
For the DA1469x based devices with WiRa functionality enabled is it critically important to have the crystal 32MHz trimmed within 3 ppm.
Antenna¶
Radiation pattern¶
Antenna radiation pattern as a significant impact on the WiRa performance. It is highly important to select an antenna with a balanced radiation pattern. It is possible to implement a suitable antenna as a chip ceramic and PCB trace antenna.
Offset trimming¶
The board design will dictate the delay from the antenna to the antenna demodulator. This infers a static offset in the distance measurement. The software can compensate for it and there’s a parameter store in the configuration partition of the flash to set it correctly. The board needs to be characterized in order to allow the correct offset to be program in production.
Battery¶
The battery profile needs to be correctly setup in the custom_charging_profile.h
file to allow the charge current to be correctly.
Device parameters¶
Please refer to the Device parameters in order to setup correctly the non-volatile parameters during production.