Could you advise an estimate for S32K344 current consumption during FOTA?
We need it for an SBC component calculation exercise for customer support.
In my understanding, there is no official NXP value specifically for “FOTA current consumption”, but based on Application note(AN14068) and behavior of the S32K3 family, FOTA current should be estimated using normal RUN‑mode current, because FOTA activates many high‑power blocks?
Thank you for the clear instructions! I will guide to customer
Hi @YukoKinto,
You are correct, there are no official values for FOTA current consumption, however, you can estimate it using the S32K Power Estimation Tool (PET).
Typically, a FOTA process uses the core running at/or near full frequency, along with:
- Flash operations (high current domain V25 + V11 load)
- QSPI if external flash image handling is used.
- HSE security engine if image authentication is enabled.
- Communication stack, such as CAN‑FD or Ethernet.
With this, we can configure a bare-bones PET profile:
Obviously, this will greatly depend on power supply, operating temperature, other peripherals at use, etc. Also keep in mind that current consumption may peak when flashing (Program/Erase Typ current consumption is 3.9mA).
You can use this as a rough estimate and test the actual consumption once you have the FW working in the MCU. For an even closer estimate, you can separate the profiles for your FOTA stages: Download/Reception, Authentication, Flash programming, Verification.
Note: The tool does not consider factors such as floating signals, external components, or voltage regulator efficiency. The data provided in the tool are estimations only based on ideal conditions. Actual results may vary.
Best regards,
Julián
Hi @narsimh_kamath,
Yes! That seems okay for a rough estimate. Of course, this is without taking into consideration HW design and IOs being used.
There are also some useful tips on the S32K3 Low Power Management AN and demos document (Hardware considerations, current measurement, etc.).
Glad the feedback was helpful!
Best regards,
Julián
Hi @Julián_AragónM - thanks a lot for the extremely helpful feedback! The indicative estimate is valuable as all we need for now is maybe a ballpark. I will run with an assumption for now that during FOTA, the power consumption due to S32K344 is tentatively < 1W (1000 mW). Pls let me know if you a risk in this assessment.
@YukoKinto - thanks for initiating.