WT02V40V interface with STM32L4 - Reg

[Sneha Karthikeyan]

Hi team,

We need to interface STM32L4(Host MCU) with WT02V40V in our design.

Is UART communication enough for interface both?

And also, Is CS pin common for SPI and QSPI?

We're not going to give USB power. How to connect the D+ and D- pins?

For VBAT-3.6V(Pin 17), Can I give 3.3V?

Is SWDIO and SWCLK enough for programming the module? Or SWO needed

Thanks!

[Simonr]

Hi

1. The nRF7002 will require SPI or QSPI as an interface to the host SoC/MCU.
2. Yes, the select pin is the same (Pin 36) for SPI and QSPI.
3. There is no USB interface on the nRF7002, so there are no D+/D- pins here to connect. If you're referring to the STM32L4's USB, the product specification of that MCU should have some reference circuitry telling you what to do with USB pins when not used.
4. Yes, VBAT can be powered with 2.9-4.5 V, with 3.6V just being the nominal voltage.
5. Usually SWDIO and SWCLK is sufficient for programming, but you should check with the Host MCU vendors to make sure. How to program the nRF7002's OTP is described in chapter 9 of our product specification.

Best regards,

Simon

[Sneha Karthikeyan]

Thanks for your reply.

[puz_md]

Just wondering... why using the WT02V40V with a STM32L4? According to the product description (see here), the WT02V40V already includes a nRF5340 which probably is stronger than the STM32L4...