CC3351: Could TI provide recommended power rail traces' width information?

Hi Jesse,

When it comes to trace widths, it's not a matter of defining a minimal or recommended value. Rather, it's the designer's responsibility to ensure that the routing in his layout met our criteria mentioned in our CC33xx Hardware integration User's Guide.

Our guide provides general guidelines that highlights what's important for reliable performance of the CC3351.
For instance, the 3.3 [V] rail (which powers the PA), should be able to carry relatively high current (according to the CC3351's datasheet). Since this is a power supply rail, it's important to keep its trace as wide as possible. A thinner trace introduces more resistance, which can result in significant voltage drop (IR drop). In such a case, the voltage seen at the CC3351 input pin may be lower than the intended 3.3 [V], potentially leading to performance issues.

Trace width also depends heavily on the capabilities and pricing structure of the chosen PCB manufacturer, as well as layout constraints such as dense component placement and limited routing area. These variables are unique to each design, and for this reason, we don't specify exact values for trace widths, nor lengths.

We encourage designers to apply best practices in routing and layout, and we're happy to support them doing so. If desired, customers can request a design review for their SimpleLink-based designs (using this link). Once approved, one of our HW engineers (such as myself) will review the design (both schematics and layout) to ensure the CC3351's HW requirements are fully met.

Best regards,
Omri