The MFS2633 cannot be powered up

[Borden]

We have procured the power chip MFS2633AMDA0AD. After PCBA production and powering up the device(power is 12V, wake1 is 9V, VMONEXT is 0V or open ). Result:  Only VPRE is at 5.4V, VBOS is at 5V, and VDIG is at 1.6V, while LDO1, LDO2, and other power outputs remain unpowered. Regardless of whether the DEBUG pin is set to 8V (OTP mode) or 5V (debug mode), the behavior is consistent.

Could you please confirm if this chip requires an OTP  update using a special tool before it can be used?

[TomasVaverka · Accepted solution]

Hi Hongyu,

Yes, the A0 variant is "empty" and its OTP needs to be first programmed with a configuration (e.g. voltage levels, watchdog parameters, fault thresholds etc.) tailored to your system's power/safety requirements. This can be done using our NXP GUI tool and the FS26 Safety SBC Programming Socket Board (KITFS26SKTEVM).

Note that other non-A0 variants have their OTP already programmed and cannot be altered. The configuration parameters can be found in the corresponding OTP reports which are available in the Comparison Table of the FS26 website.

Screenshot 2025-01-12 195047.png

Keep in mind that your own OTP emulation and programming of the A0 variant is allowed during engineering development. Only NXP or a recommended third party are allowed to program the device for production purposes.

BRs, Tomas

[Borden]

Thanks very much!