Mcu Energy Meter Tools; Description; Operating Voltage; Idd Measurement - ST STM32L562E-DK User Manual

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 MCU (U22). The energy meter tools included in 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 power supplies, 3V3_PM, and 3V3_MCU_PM for the
STM32L562QEI6Q.
6.19.3

IDD measurement

The STM32L562E-DK Discovery kit has a circuit to measure the STM32L562QEI6Q current consumption (IDD)
within a range of 300 nA to 150 mA.
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:
• Supply the STM32L562E-DK Discovery kit with USB_PM through the USB connector (CN16).
• Set JP4 jumper [7-8] to select 5V_PM power.
• Keep JP3 to the correct voltage, to be aligned with the 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 the JP2 header. To measure a current below 300 nA, remove it and add an external
ammeter connected to JP2.
• Set the SW1 switch to the PM_MEAS position to measure the current consumption.
Section 6.3 Power supply
Figure 26 shows the energy metering hardware configuration.
USB_PM
(bottom side)
(CN16)
UM2617 - Rev 7
provides information on how to use the powering option.
Figure 26. Energy metering hardware configuration
LCD 240x240 + CTP
5V PWR 5V PWR source
(LD12) (JP4 [7-8])
UM2617
MCU energy meter tools
IDD_MCU
(JP2)
VDD_MCU:
- JP3 [1-2]: 3V3 selection
- JP3 [2-3]: 1V8 selection
VDD_MCU:
Select PM_MEAS
(switch on the left)
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