Adjustable Power Supply - ST STM32L073Z-EVAL User Manual

Hardware layout and configuration
Jumper
JP7
JP4
JP5
JP13
The red LED LD5 is on when the board STM32L073Z-EVAL is powered correctly by the 5 V.
7.3.1

Adjustable power supply

As detailed above the STM32L073VZT6 microcontroller can be supplied by a variable
voltage when pins 2 and 3 of JP12 are connected by a jumper. Use the potentiometer RV1
16/64
Table 2. Power related jumpers (continued)
V power pin of STM32L073Z can be powered externally by an external
DD_MCU
power supply, providing no jumper is connected to JP7. The external supply can be
connected to pin2 of JP7, as shown here:
V power pin of STM32L073Z is connected to V
DDA
shown (default setting):
To measure the current drawn by V
JP4 and connect an ampere-meter to JP4, positive terminal to pin 1, negative to pin
2.
V pin of STM32L073Z is connected to V
REF+
(default setting):
To measure the current drawn by V
JP5 and connect an ampere-meter to JP5, positive terminal to pin 1, negative to pin
2.
By default JP13 is not connected to let ST-LINK detect automatically if it should
provide the supply of the board from ST-LINK USB V
If JP13 is connected, ST-LINK will never supply the evaluation board from ST-LINK
USB.
UM1878 Rev 2
Description
when JP4 is closed as
DD_MCU
pin of STM32L073Z, remove the jumper of
DDA
when JP5 is closed as shown
DD_MCU
pin of STM32L073Z, remove the jumper of
REF+
(default setting).
BUS
UM1878