Hardware layout and configuration
UM1537
12/52
Doc ID 023059 Rev 1
A total of three power modes are supported on the board and can be configured by setting
the related jumpers
JP7, JP9, JP10 and JP11
and
its related notes.
●
Mode1: the VDD and VDDA are connected together and powered by a fixed 3.3 V.
●
Mode2: the VDD and VDDA are connected together and powered by an adjustable
voltage ranging from 2.0 V to 3.6 V.
●
Mode3: the VDD is powered by an adjustable voltage ranging from 2.0 V to 3.6 V while
VDDA is powered by a fixed 3.3 V.
Note:
MCU IDD measurement can be done with a current meter mounted on JP7 when it is open.
Note:
Jumper JP11 must be open (to disconnect VDDA from all analog power VDD_ANA which is
connected to the analog circuits on the board) for MCU Idd measurement.
The LED LD6 is lit when the STM320518-EVAL evaluation board is correctly powered by
5 V.
JP12
The Vbat pin of STM32F051R8T6 is connected to VDD when JP12 is set
as shown (default setting):
The Vbat pin of STM32F051R8T6 is connected to a 3 V battery when
JP12 is set as shown:
Table 4.
Power mode related jumpers
Power mode
Power mode configuration
MCU IDD measurement
JP9
JP10
Mode1
OK
Not allowed
Mode2
OK
Mode3
Not allowed
Table 3.
Power source related jumpers (continued)
Jumper
Description
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
