UM1537 datasheet(12/52 Pages) STMICROELECTRONICS

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Hardware layout and configuration

UM1537

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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 as described in Table 4 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

5V.

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

Not allowed

Mode2

Mode3

Not allowed

Table 3.

Power source related jumpers (continued)

Jumper

Description

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