AN4365 datasheet(20/35 Pages) STMICROELECTRONICS

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STM32F4 current consumption measuring

AN4365

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DocID025303 Rev 2

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Define ART accelerator configuration

We can enable the full ART with both data/instruction caches and prefetch buffer by

uncommenting both corresponding macros. We can enable the ART except prefetch by

commenting the prefetch macro. See the example below.

/* Enable ART */

#define ART_Enable

/* Enable prefetch when ART is enabled */

// #define Prefetch_Enable

•

Define the voltage supply value

The voltage supply used in the discovery kit while measuring should be specified by

uncommenting either the 3.3 V macro or the 1.8 V macro, like in the example below.

/* Define the Power supply value */

/* Vdd = 3,3 V */

#define VDD3_3

* Vdd = 1,8 V */

//#define VDD1_8

2.2

Current consumption measuring

This section describes the applicable software and hardware environment set-up.

2.2.1

Hardware/software environment description

To start measuring on your STM32F4’s discovery board, the minimum requirements are as

follows:

•

One of STM32F4’s discovery boards: STM32F401C-DISCO MB1115B /

STM32F4DISCOVERY MB997C / STM32F429I-DISCO MB1075B

•

“USB type A to Mini-B” cable, to power the board (through USB connector CN1) from a

host PC and to connect to the embedded ST-LINK/V2 for debugging and programming

•

An ammeter

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A power supply

Before you start measurements, you should establish the connection with the STM32F4

discovery board as shown in Figure 9 by proceeding as follows:

•

Connect the supply voltage cables to the dedicated external supply input pins (GND pin

for the ground, and 3 V pin for the 3.3 V or 1.8 V). LED LD2 (PWR) will light up.

•

Remove the Idd jumper of the discovery board dedicated to current consumption

measurement (JP1 for STM32F40x/41x, JP2 for STM32F401x and JP3 for

STM32F429/439x) and connect the ammeter cables. Ensure that the ammeter is set to

the mA scale.

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