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6.19
MCU energy meter tools
6.19.1
Description
The STM32L562E-DK Discovery kit embeds energy meter tools.
This function is performed with the support of the U22 STM32L496VGT6 MCU. The energy meter tools included
on the STM32L562E-DK are a part of the standalone board X-NUCLEO-LPM01A, also called PowerShield.
The X-NUCLEO-LPM01A expansion board is a programmable power supply source, from 1.8 to 3.3 V, with
advanced power consumption measurement capability.
6.19.2
Operating voltage
The power metering part is independent and has its own power supplies, 3V3_PM, and 3V3_MCU_PM for the
STM32L562QEI6QU.
6.19.3
IDD measurement
The STM32L562E-DK Discovery kit has a circuit to measure the STM32L562QEI6QU current consumption (IDD)
within a range of 300 nA to 150 mA.
In order to measure MCU current lower than 300 nA, a JP2 jumper can be configured to use an external ammeter.
The recommendations for the power metering measurement are the following ones:
•
Supply the STM32L562E-DK Discovery kit with USB_PM through the CN16 USB connector.
•
Set JP4 jumper [7-8] to select 5V_PM power.
•
Keep JP3 to correct voltage, to be aligned with energy metering setting: 1.8 or 3.3 V for the device I/O
compatibility. By default, the energy meter tools start at 3.3 V.
•
Keep the jumper on JP2 header (to measure a current below 300nA, remove it and add an external ammeter
connected on JP2).
•
Set the SW1 switch to PM_MEAS position, to perform the current consumption measurement.
Section 6.3 Power supply
Figure 26
shows the energy metering hardware configuration.
UM2617 - Rev 2
provides information on how to use the powering option.
Figure 26.
Energy metering hardware configuration
UM2617
MCU energy meter tools
page 41/61
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