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AWR1642: AWR1642 can't be flashed using new PMIC LP87524J-Q1

Part Number: AWR1642
Other Parts Discussed in Thread: LP87524J-Q1, , LP87524B-Q1

TI,

I have a question about the new PMIC LP87524J-Q1 for AWR1642 radar. The reference design has the previous generation LP87524B-Q1 on the EVM.

I made some radar boards based on TI EVM's sch. I have no issue to flash firmware to boards through UART (I have one USB to UART converter board). On the new design, I changed the LP87524B-Q1 to LP87524J-Q1. This one PMIC provides all power rails to power up the radar chip. So I can remove the step down regulators. However, I am facing the trouble to flash the chip.

I have two cases:

1. I power up the radar board first, then connect the USB/UART converter to PC. I can flash firmware to the radar boards. Everything looks okay in this situation.

2. I connect the USB/UART converter to PC first (The UART carries 3.3V), then power up the radar board. I can't change radar to flash mode (mode5). The radar is always in function mode even I set the radar to the flash programming mode. So I can't flash the radar in this situation.

What is the cause of this issue?? and How can I solve this issue?

 

Thanks,