MIMXRT1176DVMAA - Not detecting over the JTAG

[gopalakrishna]

Hi Team

We developed a custom board based on MIMXRT1176DVMAA, and unfortunately,  device could not detecting over the JTAG.

During my troubleshooting, I found that internal LDO output "VDDA_1P0" (Pin N11) is not showing voltage (0V) and this output connected to VDD_MIPI_1P0 (Pin F10) DSI lines interface.

Could this be a problem preventing the device detecting over JTAG?

Verified the PMIC power sequence, all voltage rails sequence is as per the datasheet recommended.

Thanks.

Regards,

Gopala

[mayliu1]

Hi @gopalakrishna ，

Thank you so much for your interest in our products and for using our community.

Regarding "During my troubleshooting, I found that internal LDO output "VDDA_1P0" (Pin N11) is not showing voltage (0V) and this output connected to VDD_MIPI_1P0 (Pin F10) DSI lines interface."

Could you provide more detailed information? Have you followed the design of the MIMXRT1170-EVKB board?

https://www.nxp.com/webapp/Download?colCode=MIMXRT1170HDUG

Please refer to the user guider "Hardware Development Guide for the MIMXRT1160/1170 Processor"

particularly Chapter 3 "Power Supply," to confirm whether your board design complies with the requirements outlined in Table 1 "Processor Power Supply Capacitors When Using On-Chip DC-DC Regulators."

Did you add 1 ms R/C delay , DCDC_PSWITCH should delay 1 ms with respect to DCDC_IN to guarantee that DCDC_IN is stable before the DC-DC starts up.

Please use an oscilloscope to measure the power-up sequence of the RT1170.

Best Regards

MayLiu