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NRF52832 SDK15 SD132 V6.0 sleep mode enter

Hello Nordic Guys

We are trying to run ble_app_uart example on our custom hardware. SDK 15, SD132V6.0 . Problem what we experiencing is: NRD chip never goes to sleep, it reaches sd_power_system_off(); and resets within function. We think it is hardware related issue, because same code (in fact it is an example from SDK without any modifications) runs perfectly on NRF52 development board.

Schematic attached for the reference.

marking on the chip :

N52832

QFAAB0

1745JY

Can you please advise if it valid chip marking? and anything else what we can do, to address this issue.

Thank you,

Andrew

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