How about SL-CNWLC05801V1？

[Schuyler]

At present, I have contacted the project about NFC power supply, but there has been no progress. The energy output through the EH pin of ST25DV has not successfully powered L4(MCU). Currently we know that SL-CNWLC05801V1 uses STM8, can its MCU be powered by NFC power supply? Is there any other way I can wirelessly power the MCU via NFC?

[Peter BENSCH]

The SL-CNWLC05801V1 is a suggestion on how to implement an NFC reader in automotive environments. However, the STM8S mentioned there is not an ultra low power MCU, so it cannot be powered by the few milliwatts from the NFC field. Instead, one could use an STM8L, where it must be noted, however, that all STM8s are set to NRND (Not recommended for new design).

Regards
/Peter

[Schuyler]

Hi @Peter BENSCH 

Ok, so if I want to use the NFC antenna to get energy that can drive the MCU, how do I design the energy that I get from the NFC to charge the battery and then drive the MCU? Is this feasible?

[Peter BENSCH]

The problem will be that batteries typically require a more or less complex charging circuit with a correspondingly high input voltage. If you can find a battery that can be charged together with the charging circuit (!) with significantly less than 10mW, this should be possible, but then not charge the battery and operate the MCU at the same time.

[Schuyler]

Hi @Peter BENSCH 

Well, I'm very interested in your suggestion. So does ST have a sample product with NFC antenna and battery charging?

[Peter BENSCH]

Not that I know of.