MCX MicrocontrollersのトピックRe: Unable to program MCXN236VNLT custom board

Unable to program MCXN236VNLT custom board

sstcor — Mon, 31 Mar 2025 17:10:10 GMT

Designed a PCB based on the MCXN236VNLT and am trying to program the board using an MCU-Link debug probe, but I am getting the following error.

LinkFlash tool output

Re: Unable to program MCXN236VNLT custom board

Alice_Yang — Tue, 01 Apr 2025 02:30:17 GMT

Hello @sstcor

Please review the FRDM-MCXN236 board schematic and verify your hardware design, particularly the SWD interface and power circuitry.

https://www.nxp.com/design/design-center/development-boards-and-designs/FRDM-MCXN236

Alice

Re: Unable to program MCXN236VNLT custom board

sstcor — Tue, 01 Apr 2025 16:02:04 GMT

Hi @Alice_Yang ,

After reviewing the schematic, I noticed VDD_SYS on the board is outputting ~3.2V and the datasheet says it should be between 1.71-1.98 V. It's floating in the schematic. Is it normal on 100 pin package?

I have connected the following pins to MCU-Link.

MCU-Link	NXP MCXN236
VTarget	3.3V
GND	GND
SWDIO	SWDIO
SWCLK	SWCLK
RESET	RESET

Multimeter readings: VDD_MCU = 3.3 V, VCore = 1 V

Re: Unable to program MCXN236VNLT custom board

sstcor — Tue, 01 Apr 2025 19:21:17 GMT

Issue resolved. Missing a 2.2uF capacitor on VDD_SYS pin.