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  • Case ID: 353220
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nrf5340 can not flash

Neo Yang

Hello,

we made a circuit board with nrf5340. We only burned the blinky program once for testing and it was successful. However, when we tried to burn the program again, it always showed "Failed to connect to target".

We attempted to recover the chip using the command "nrfjprog --recover -f NRF53", but it reported an error.

How should this issue be addressed?

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    The problem has been solved. The nRF5340 hardware is designed to operate in the LDO power supply mode (that is, no necessary external components such as inductors are configured for the DCDC mode), but the burned-in program enabled the DCDC mode, causing the chip to fail to start properly and thus preventing it from being re-burned with other programs. The solution is to briefly supply power to the DECD pin to VDD, allowing the chip to temporarily recover. Then, re-burn the firmware that disables DCDC, and the board can be restored.

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  • 0

    The problem has been solved. The nRF5340 hardware is designed to operate in the LDO power supply mode (that is, no necessary external components such as inductors are configured for the DCDC mode), but the burned-in program enabled the DCDC mode, causing the chip to fail to start properly and thus preventing it from being re-burned with other programs. The solution is to briefly supply power to the DECD pin to VDD, allowing the chip to temporarily recover. Then, re-burn the firmware that disables DCDC, and the board can be restored.

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