ST67W Internal/External CoExistence Support

[gokhansen]

Hello,

I am designing a Matter/Zigbee Gateway using an STM32U5 as the host. My planned architecture includes:

1. ST67W: Handling Wi-Fi and Thread (Matter over Wi-Fi/Thread).

2. STM32WBA (or similar): Handling Zigbee (Matter Bridge logic).

I have two specific questions regarding the ST67W's coexistence capabilities:

1. Internal Coexistence: Does the ST67W natively support concurrent operation of Wi-Fi and Thread simultaneously without external hardware arbitration?

2. External PTA Support: Does the ST67W expose 3-wire PTA pins (Request/Priority/Grant) to manage coexistence with an external 802.15.4 radio (e.g., the STM32WBA running Zigbee)?

Basically, I need to confirm if it supports a "Hybrid Coexistence" setup where it manages internal Wi-Fi/Thread traffic while acting as a PTA Arbiter for an external Zigbee MCU.

Thanks in advance.

[Benoit MARCHAND · Accepted solution]

Hello,

1/ ST67W is capable of managing coexistence between the different protocols, and in particular between Wi-Fi and 802.15.4.
Concerning 802.15.4, Thread is under development. ST67W is also Zigbee ready, but SW is not yet in development state.
-->Depending on your plannings, your complete use case could be supported by ST67W/U5 (Matter on U5) without needing an additional device like STM32WBA.

2/ There is no PTA interface available to manage coexistence with a STM32WBA.
 Depending on your final use case, it could be possible to manage it at application level, although this is not coexistence.

Br,
Benoit