PF3000 RESETBMCU behavior when OTP_PG_EN=1

[mamorukanou]

Hi,

I have question about PF3000 RESETBMCU pin behavior.

According to the PF3000 data sheet, RESETBMCU is deasserted 2ms after all power ups.

It's call "default mode". i.e, OTP_PG_EN=0.

On the other hand, we can change to "fault mode" by writing OTP_PG_EN = 1.

We can't find out detailed explanation of this fault mode.

Please let me know :
Q1) In "fault mode", which power supply (all DC-DC, LDO ?) is specifically checked ?

Q2) What does PMIC specifically check?　(Is the voltage appropriate?  or  over current?)

Best Regards,

Kanou

[reyes · Accepted solution]

Hi Kanou,

When configured for its fault mode, RESETBMCU is de-asserted after the start-up sequence is completed only if no faults occurred during start-up. At anytime, if a fault occurs and persists for 1.8 ms typically, RESETBMCU is asserted, LOW. The PF0100 is turned off if the fault persists for more than 100 ms typically. The PWRON signal restarts the part, though if the fault persists, the sequence described above will be repeated.

All regulators (DC-DC and LDOs) are checked.

Faults:

+ Over current on all Regulators (the Over-Current Thresholds are specified for each regulator on the Electrical Characteristics Tables on the datasheet)

+ Short Circuit on all general purpose LDOs

+ Thermal thresholds

Best Regards,

Jose

NXP Semiconductors