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Rockbox mail archiveSubject: Re: Use SLEEP instruction for longer (?) runtimeRe: Use SLEEP instruction for longer (?) runtime
From: Björn Stenberg <bjorn_at_haxx.se>
Date: Sat, 25 Jan 2003 16:38:54 +0100 Andrew Jamieson wrote: > No power save mode: 110mA > CPU Sleep: 98mA > CPU Stop: 95mA > CPU Standby: 81mA These numbers are strange. The drop from sleep to standby should be at least 40mA, according to the CPU docs: Table 20.2 DC Characteristics (cont) Item Symbol Min Typ Max Unit Test Conditions --------------------------------------------------------------------------- Current Ordinary Icc -- 60 90 mA f = 12.5 MHz consumption operation -- 80 110 mA f = 16.6 MHz Sleep -- 40 70 mA f = 12.5 MHz -- 50 60 mA f = 16.6 MHz Standby -- 0.01 5¹ µA Ta < 50°C -- -- 20.0² µA 50°C < Ta --------------------------------------------------------------------------- Notes: 1. 50 µA for the SH7032. 2. 300 µA for the SH7032. How can standby mode only drop 14 mA? > So, it seems having a more efficient scheduler to increase the time spent > sleeping does not seem worthwhile, as the best we can get it only 3mA more > than what we have at the moment (Simon's implementation). I agree. Since measurements show this model actually does have a significant effect, I now approve of it. -- BjörnReceived on 2003-01-25 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |