UM1521
Hardware layout and configuration
Doc ID 022868 Rev 1
9/56
2.2 Power
supply
The STM32L152D-EVAL evaluation board is designed to be powered by a 5 V DC power
supply and to be protected by PolyZen from a wrong power plug-in event.
It is possible to configure the evaluation board to use any of following four sources for the
power supply.
●
5 V DC power adapter connected to CN2, the power jack on the board (power supply
unit (PSU) on silk screen). The external power supply is not provided with the board.
●
5 V DC power with 500mA limitation from CN14, the USB type B connector of ST-
LINK/V2 (USB 5 V power source on silkscreen (ST-LINK/V2)).
●
5 V DC power with 500mA limitation from CN15, the USB type B connector (USB 5V
power source on silkscreen (USB)).
●
5 V DC power from CN10, the extension connector for daughterboard (daughterboard
power source on silkscreen (D5V)).
The LEDs indicate the following:
●
LED LD9 is lit when the STM32L152D-EVAL board is powered by 5 V correctly.
●
Red LED LD8 is lit when the MCU is powered by low voltage (VDD < 1.8 V).
●
Yellow LED LD7 is lit when the MCU is powered by voltage (1.8 V < VDD < 2.2 V).
●
Green LED LD6 is lit when the MCU is powered by voltage (2.2 V < VDD).
The power supply is configured by setting the related jumpers JP1, JP5 and JP10 as
described in
Table 2.
Power supply jumper settings
Jumper
Description
Setting
JP1
JP1 selects one of the four possible power supply sources.
– For power supply jack(CN2) to the STM32L152D-EVAL only, JP1 is set
as shown to the right:
STK
U5
V
D5
V
PSU
– For power supply from the daughterboard connectors (CN10) to
STM32L152D-EVAL only, JP1 is set as shown to the right:
– For power supply from USB (CN15) to STM32L152D-EVAL only, JP1
is set as shown to the right:
– For power supply from USB connector of ST-LINK/V2 (CN14) to
STM32L152D-EVAL only, JP1 is set as shown to the right:
(
Default setting
)
For power supply from power supply jack (CN2) to both STM32L152D-
EVAL and daughterboard connected on CN5 and CN10, JP1 is set as
shown to the right (daughterboard must not have its own power supply
connected)
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