STM32WL33CC1 – Wakeup LPAWUL/MRSUBG Failing After 10m

[SergioSI]

Hello everyone,  

I’m experiencing an issue with communication between two STM32WL33CC1 devices. I’m using one for LPAWUL wakeup receiver and the other for MRSUBG transmitter, but I noticed that beyond 10 meters, the communication starts failing.  

Setup Details:

SB1 resistor: 0Ω  

-C3 resistor: 0Ω

-Configured for +20 dBm PA  

-Test environment: tested indoors in a hallway

The communication works fine up to 10 meters, but beyond that, wakeup packets are not received reliably. 

Can everone help me solve this problem and get +/-30 stable meters?

Code LPAWUR:

https://github.com/STMicroelectronics/STM32CubeWL3/tree/main/Projects/NUCLEO-WL33CC/Demonstrations/LPAWUR/LPAWUR_WakeupRadio_Rx

Code MRSUBG:

https://github.com/STMicroelectronics/STM32CubeWL3/tree/main/Projects/NUCLEO-WL33CC/Demonstrations/MRSUBG/MRSUBG_WakeupRadio_Tx

[STTwo-32]

Hello @SergioSI 

To improve the distance between the STM32WL3 nodes, I may suggest you fit the C3=100pF and try again. The distance may improve but the distance of 30 meters seems to be a real challenge for you. We can't guarantee such a distance. 

Best Regards.

STTwo-32