Hello @AllanAn ,
One of customer is facing below issue with regards to MC33FS6500LAE PMIC :
We are not able to determine the reason for the LBIST error as no such clear causes are mentioned in the documentation with regards to the chip.
Please find the waveforms attached below of the start-up Sequence:
Kindly let me know what is causing the initial undervoltage and LBIST error ?
Regards,
Jasper Raj Immanuel
Solved! Go to Solution.
Hi Jasper,
1. What's the voltage level of IO2,IO3 when device powerup ?
2. When IO2 voltage is 12V during device powerup,fail safe machine will stop and device will enter test mode, ABIST1 will fail. after IO2 go down, fail safe state machine will continue and ABIST1 will pass.
3. so our datasheet says max rating of IO2/IO3 is 8V, please make sure IO2/IO3 voltage are below 8V during powerup.
4. If LBIST fail during device powerup, it will not stop RSTB release and MCU can send SPI command to SBC, but FS0B/FS1B will not be released due to LBIST fail.
Brs
Allan
Hello @allan
Customer has provided below feedback and follow up query :
Kindly find below the update and further query wrt to our application:
Future Steps:
Kindly provide your feedback,
Regards,
Jasper
Hi Jasper,
1. What's the voltage level of IO2,IO3 when device powerup ?
2. When IO2 voltage is 12V during device powerup,fail safe machine will stop and device will enter test mode, ABIST1 will fail. after IO2 go down, fail safe state machine will continue and ABIST1 will pass.
3. so our datasheet says max rating of IO2/IO3 is 8V, please make sure IO2/IO3 voltage are below 8V during powerup.
4. If LBIST fail during device powerup, it will not stop RSTB release and MCU can send SPI command to SBC, but FS0B/FS1B will not be released due to LBIST fail.
Brs
Allan