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AM572x PET DDR power consumption question

Michi Yama
Guru 10030 points
Other Parts Discussed in Thread: AM5728

Hi,

I have one question regarding AM5728's power consumption.

I calcurated the power consumption of AM5728 with one use case. Please see the below two pictures.

As you see from the pictures, I changed DDR3 frequency from 532 MHz to 400 MHz. Please see the total power's cell.

DDR3 532MHz working : 2082 mW (VDDS_DDRx : 30mA )

DDR3 400 MHz working : 2085 mW (VDDS : DDRx : 40mA)

I was surprised this result. Because I thought DDR3 lower frequency is lower current. But the result was that the current of DDR3 400MHz is bigger than the current of DDR3 532MHz.

I don't know why this result happened. What is the cause of this result?

Please let me know.

Best regards,

Michi