Support and General Use > Hardware
Sansа Clip Zip - Improve battery life
saratoga:
I'm curious how stable frequency scaling is for you?
Mihail Zenkov:
Few hours playing APE (switch freq each second). I try find way switch PCLK to master clock or PPL but no success. Have any idea on how we can do this?
If you have freeze with this patch first try remove set CVDD1.
Mihail Zenkov:
I try new solution - don't switch PCLK. In this case at normal frequency we have FCLK 40MHz / PCLK 20MHz, at boost - FCLK 240MHz / PCLK 120MHz. It very stable for me: 12 hours of APE and two day of ordinarily use without any freeze. Possible it slightly less effective, but not sure - decoding at PCLK 120MHz work faster and we need less time in boost mode.
saratoga:
--- Quote from: Mihail Zenkov on October 04, 2014, 07:47:09 PM ---I try new solution - don't switch PCLK. In this case at normal frequency we have FCLK 40MHz / PCLK 20MHz, at boost - FCLK 240MHz / PCLK 120MHz.
--- End quote ---
Are you sure about that? Max PCLK is 60 MHz IIRC, and when we tested, raising PCLK increased power consumption a lot more than raising FCLK (because many things on the chip also increase in frequency).
Mihail Zenkov:
--- Quote from: saratoga on October 04, 2014, 07:53:22 PM ---Are you sure about that?
--- End quote ---
Yes.
--- Quote from: saratoga on October 04, 2014, 07:53:22 PM ---Max PCLK is 60 MHz IIRC, and when we tested, raising PCLK increased power consumption a lot more than raising FCLK (because many things on the chip also increase in frequency).
--- End quote ---
It increase power consumption a lot (+4.3mA) if we compare idle and much less difference if we have load: +2.5mA on light load (playing mp3). At full load I suppose (no measure it) it have no significant difference or may have better result than low PCLK.
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