MCU Boot high current in a custom board

[PabloL]

Hello,

I am testing a simple BLE application running in two different boards: nRF5340-DK and Fanstel BC40M.
First test without MCU Boot, second test with MCU Boot.
Same firmware in both boards and measure the average power consumption:

Without MCU BOOT
#	Board	Current
1	nRF5340-DK	<1mA
2	BC40M	<1mA

After adding the MCU Boot in prj.conf:

CONFIG_BOOTLOADER_MCUBOOT=y
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y
CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU_SPEEDUP=y

With MCU BOOT
#	Board	Current
1	nRF5340-DK	<1mA
2	BC40M	>7mA

Question:

What could be causing the high current draw in the Fanstel module due to the addition of the MCU Boot? 

Thanks!

[nordicator_prim3]

Hi,

Are you using a bare BC40M, or are you using the evaluation kit (EV-BC40M)?

[PabloL]

Hi, 

I tested both a custom board with BC40M and EV-BC40M. Same result.

Thanks!