UM2408 Rev 2 25/51
UM2408 Hardware layout and configuration
50
If a deadlock is faced due to a mismatch between the HW
board setting and the FW setting (LDO/SMPS), the user can
recover the board by doing the following:
- Power off the board
- Connect CN11 ‘BT0’ pin (BOOT0) to VDD using a wire
- This changes the BOOT0 pin to 1 instead of 0 and thus the
device boot address is changed to boot address 1 making the
bootloader starting in System memory, instead of starting the
FW in the user Flash (FW that is setting a wrong LDO/SMPS
configuration)
- Power on the board and connect using
STM32CubeProgrammer
- Erase the user Flash
- Power off the board and remove the wire between BOOT0
and VDD
- The board is now recovered and can proceed normally.
6.4.9 JP5: 1.8 V / 3.3 V selection
JP5, labeled "VDD_MCU" is used to select the VDD supply for the MCU:
• Jumper JP5 pin 1-2: VDD_MCU = 3.3 V (Default configuration)
• Jumper JP5 pin 2-3: VDD_MCU = 1.8 V
6.5 External SMPS selection
The user can connect an external SMPS to the CN6 footprint (For example
ST1PS02D1QTR).
CN6 pin-out is described in Table 11.
Table 11. External SMPS selection
CN6 pin Pin name Function
Configuration when
using an external
module connected to
CN6
CN6 Pin 1 3V3_VDD 3.3V VDD supply for MCU -
CN6 Pin 2 SMPS_V1 (PG8)
External SMPS output voltage
selection “D1”
(1)
SB34 ON / SB31 OFF
CN6 pin 3 VOUTVDD
External 3.3V VDD supply for
MCU
-
CN6 Pin 4 SMPS_EN (PG9) External SMPS Enable “EN”
(1)
SB35 ON / SB41 OFF
CN6 pin 5 1V2_VOUTCORE
External SMPS 1.2V or external
power supply providing 1.2V for
MCU VCORE (VCAP pins)
-
CN6 Pin 6 SMPS_SW (PG10)
External SMPS Enable for the
auxiliary output voltage “AUX”
(1)
SB33 ON / SB30 OFF
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