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Volhout

Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 6104
Posted: 01:24pm 29 Aug 2024      

  phil99 said  
  Quote  Can somebody explain this to me?

Putting @JanVolk,s data in a table:-
CPU Speed  RP2040   RP2350
48MHz      13mA     9mA
133        28       -
150        -        20
252        50       37
378        76       57
420        82       NA

  Quote  As the speed is stepped up from a low speed to a higher speed, the current requirement increases with each step, right?

Yes.
.


Yes, easy to explain. The 2040 core regulator is a linear regulator. So the currrent you see is the core current at 1.1V
The 2350 has a switchmode regulator for the core voltage (3.3V->1.1V) So (quick assume efficienty 100%) you have to multiply the current with 3x to get the real core current.

This means that the 378MHz on the 2350, the core runs at 3*57=171mA (@1.1V).
That is close to the design spec of the switchmode regulator inside the 2350 (200mA design spec).

So the M33 use more power than the M0+ cores. As is expected in the same geometry.

Volhout
Edited 2024-08-29 23:28 by Volhout