How can I start up my board with a new & empty MPC5744p chip without causing the chip to brick.

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How can I start up my board with a new & empty MPC5744p chip without causing the chip to brick.

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19627152
Contributor I

Hello everybody,

I designed a control board referred to devkit-mpc5744p schematic_ Revb (SCH-29333).

When I first powered on the board, the RESET_B pin stayed low, and S32DS showed that the target may be entered reset escalation.

微信图片_20200807141845.jpg

Then I removed U4(74LVC2GD8), U5(STM6315), R17, R18, and connected JTAG-RSTx directly to MCU-RSTx, kept  RESET_B pin with a pull-up resistance R15 to 3.3V. The problem remains,and I saw the RESET_B pin always stayed low from the oscilloscope when I powered on the board.

Is the chip "dead"? How can I reuse my board? or how can I start up my board?

Thank you very much!

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lukaszadrapa
NXP TechSupport
NXP TechSupport

Hi,

if the reset is not released ever then it has nothing to do with reset escalation. Most likely, the reset is held by low voltage detectors. As a first step, I would check all supply rails.

https://www.nxp.com/docs/en/application-note/AN5267.pdf 

Regards,

Lukas

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