UCC5871-Q1: question about UVLO/OVLO of VCC1 fault

Jay wang

Expert 3971 points

Part Number: UCC5871-Q1

hi expets

according to datasheet, if UVLO/OVLO of VCC1 fault occur, the SPI cannot be read by MCU.

in this situation, how to get the UVLO/OVLO of VCC1 faults data?

over 2 years ago

0 Akshat Murali over 2 years ago

TI__Expert 3735 points

Hi Jay,

In this case, the STATUS register will record a UVLO or OVLO fault and that can be read there.

Regards,

Akshat

0 Jay wang over 2 years ago in reply to Akshat Murali

TI__Expert 3971 points

do you mean that the data of STATUS is the last data when UVLO or OVLO fault is recorded in last time?(because in last time, UVLO or OVLO fault occur, MCU cannot this time data by SPI)

right?

0 Akshat Murali over 2 years ago in reply to Jay wang

TI__Expert 3735 points

Hi Jay,

You can still read the status when a fault occurs. The SPI will be disabled, but it will be enabled again if the VCC comes back above the UVLO threshold. Then you can read it. During VCC1 fault, the device will automatically update the STATUS register. Once VCC power is back and the SPI is enabled again, the STATUS registers will read the fault. The VCC1 faults will be displayed in these registers: STATUS2[UVLO1_FAULT] and STATUS2[OVLO_FAULT1]

Regards,

Akshat

0 Jay wang over 2 years ago in reply to Akshat Murali

TI__Expert 3971 points

ok got it thanks

0 Jay wang over 2 years ago in reply to Akshat Murali

TI__Expert 3971 points

hi experts

i read your comments again and have some confusion.

i mention "Once VCC power is back and the SPI is enabled again, the STATUS registers will read the fault. ", if VCC1 isn't back(VCC1 UV/OV still exist), whether MCU can read STATUS2[UVLO1_FAULT] and STATUS2[OVLO_FAULT1] ?

+1 Vivian Qi over 2 years ago in reply to Jay wang

TI__Expert 6730 points

Hi Jay,

If VCC1 supply does not return to the normal range, the SPI will keep being disabled. Only when VCC1 returns back to the normal range would SPI be enabled again, which is when MCU would be able to read the registers.

Thanks,

Vivian

0 Jay wang over 2 years ago in reply to Vivian Qi

TI__Expert 3971 points

thank you Vivian

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UCC5871-Q1: question about UVLO/OVLO of VCC1 fault