Man that is so sweet. I guess we will find out more when everyone starts getting there Pandora's in. Also, couldn't you program the battery indicator to be more accurate if you knew approximately how much juice everything takes at different loads?mali said:MWeston posted some numbers of the CPU at 900MHz plus Bluetooth. It was about 700mA IIRC. Don't know about the rest.
Phawx said:It would just be neat if you looked at the battery and it said, "Based upon the past 2 minutes of usage, if you continue this trend you will have X:XX amount of time left."
Already possible.
marshal said:If you also have the device overclocked a bit and full screen brightness, wifi and bluetooth working, would the device really be ok ?
It should be fine. As quoted above, the system will handle up to 1.7A with a battery installed - which you will always have in real-world situations. With the Pandora using a max of 710mA and the USB port maxed out at 500mA, you're still well under the max.
Soulkiller said:I think MWeston stated in his quote that the 710mA is JUST from "overclocking" to 900mhz. So not everything is accounted for.
That's silly. I don't even know how you would go about measuring the current draw of just the CPU. Based on this post and the quote above, it is pretty clear that 710mA is the current draw of the entire system (minus wifi or any USB accessories).
djmaddis said:while we are on the topic relating to the pandora battery performance, i was curios to know what will happen when the battery does actually run out. Will the pandora just sizzle out with a load of white noise like the gp2x or will the os enter a 'safe shut down' or hybermation mode (i know this will require more ram)
Please excuse me if this question may have already been answered. I couldnt find any posts which gave a clear answer.
All power / suspend functions are controlled through software, so you can theoretically set it up however you like. I don't know what the default will be though.
Soulkiller said:710mA - Cortex pushed to full speed
40mA - Bluetooth worse case (Assuming this is correct)
500mA - USB 2.0 standard max power load
XmA - Wifi at max power sink
YmA - DSP at max power sink
ZmA - SGX at max power sink
+___________________________
1250mA + XmA + YmA + ZmA of total power sink
1250mA + XmA + YmA + ZmA = 1700mA (maximum potential power load with batery)
XmA + YmA + ZmA = 450mA of left over power
There is a rather big power drain you forgot about: The LCD screen! Also, other possible power drains if used: Speakers.
djmaddis said:while we are on the topic relating to the pandora battery performance, i was curios to know what will happen when the battery does actually run out. Will the pandora just sizzle out with a load of white noise like the gp2x or will the os enter a 'safe shut down' or hybermation mode (i know this will require more ram)
It's possible that you can say "When battery reaches 15%, alert me, when it reaches 10%, hibernate". I doubt it'll be there from the beginning, but it will be possible to do.
Benjiro said:Soulkiller said:710mA - Cortex pushed to full speed
40mA - Bluetooth worse case (Assuming this is correct)
500mA - USB 2.0 standard max power load
XmA - Wifi at max power sink
YmA - DSP at max power sink
ZmA - SGX at max power sink
+___________________________
1250mA + XmA + YmA + ZmA of total power sink
1250mA + XmA + YmA + ZmA = 1700mA (maximum potential power load with batery)
XmA + YmA + ZmA = 450mA of left over power
There is a rather big power drain you forgot about: The LCD screen! Also, other possible power drains if used: Speakers.
The quote mentioning 710mA is about forcing the system to take the most juice possible for testing the power chip. So not using the LCD in this test doesn't make sense. The 710mA should already include the LCD power draw.
Edit:
@Chip
Those links both don't work for non-Mods.
I guess so, as I always get on error page:mali said:@Chip
Those links both don't work for non-Mods.
MWeston said:When Linux is idle at the console, regardless of clock speed, the current sits about about 420mA. Running FBA at 500MHz puts the current at 600-625mA and at 900MHz it is 695-710mA. Picodrive uses less power at about 650mA at 900MHz I think it was. FBA is the most current hungry of the emulators I have tested, but just by 20-30mA or so. Even the PSX emu uses less, but it's got a bunch of debug junk in it that really slows down screen updates so it might go up when I get to see those 150+fps Zod was getting. He has been too busy to make me a better binary so it's not a realistic version of something you would play on.
Yeah, it would be great to run some IR tests on the CPU. It's going to be pretty much the same as the EVM. The Beagle board I had feels the same at 500MHz as the Pandora board does at the same speed. If you are interested, you could do some EVM tests, or does the processor mount upside down in the socket? I forget.
Another of the many concerns to address was how the battery does at high current loads. So far, since we are operating in the nominal 0.2C range, it is cool as a cucumber. It's such a big battery that the internal resistance is very low. Obviously you can't test that one yet, but the fact that it still feels cold to the touch seems convincing to me.
Off topic: I did a battery test the other day with a new cell on its first full charge. Based on the current draw (about 625mA), I predicted the battery would last 6.5hours but it ran for about a minute over 8.5 hours. The current load was very consistent for the entire day so that calculated out to over 5000mAh! Who knows, we might be in for a welcome surprise with the final product when power management is applied.