configure clock to achieve datasheet MCU current consumption?

[Hussain]

I have the NUCLEO-G431RB, and I am trying to measure the MCU current consumption in different operation modes and frequencies. I have connected a multimeter at JP6 (IDD) to monitor the current. The problem is when I set the frequency (f HCLK) as stated in the datasheet the readings I got are very different from the one in the datasheet. You can see in Figure 1 an example of what I did in configuring the clock trying to get similar values as in the datasheet in Figure 2.

Figure 1

the current value I got is 29mA.

I want to know exactly how I should configure the clock in a proper way to get the correct readings

 

 

[STTwo-32]

Hello @Hussain 

Are you sure all peripherals are disabled, prefetch is of, cashe is of, debug is disactivated.... Also, you need to make sure that temperture is exactly 25°. 

Best Regards.

STTwo-32 

[Hussain]

I did not activate any peripherals, also 'Cashe' ON and 'Prefetch' OFF as the datasheet states. I did set them both OFF and no changes happened.

Could you show me in detail how can I set the MCU settings correctly?
It is probably that I missed something that led to the wrong setup.

[Andrew Neil]

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@Hussain wrote:

I have the NUCLEO-G431RB, and I am trying to measure the MCU current consumption in different operation modes and frequencies. I have connected a multimeter at JP6 (IDD) to monitor the current.

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Are you sure that excludes all current to other things on the board - eg, the ST-Link?

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