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Absolute voltage limits for LattePanda

Posted: Mon May 16, 2016 1:51 pm
by ermingut
Probably question for LattePanda team...

What are absolute limits for LattePanda input voltage? I know that Atmega 32U4 working voltage is between from 2.7 to 5.5 V but what about other components

I'm asking this because I have 5.35 V power supply and I want to know if it is safe to power LattePanda with it.

Re: Absolute voltage limits for LattePanda

Posted: Tue May 24, 2016 4:17 am
by radiolobito
It's so important to know something about this, and the Amperes that is necesary or maximum for correct working

Re: Absolute voltage limits for LattePanda

Posted: Tue May 24, 2016 5:45 am
by schluej
Moin Moin,
If you have a look in the spec http://www.intel.com/content/dam/www/pu ... -vol-1.pdf
You will see that the tolerance is only 2% (Page240). The Max Icc is interesting too, that will explain why so many people have problems. Wrong cable and/or power supply will cause the most problems.

Re: Absolute voltage limits for LattePanda

Posted: Tue May 24, 2016 7:21 am
by ermingut
Thank you for your answers.

@schluej
Correct voltage for processor is probably provided by internal regulator to achieve stabilized voltage within tolerances. Processor is not powered directly from LattePanda power input. So input voltage (5V) does have nothing to do with 2% tolerance of processor voltage.

I'm well aware of amperage needed and all things that may affect proper operation (voltage drop on cable, "smart" chargers that adopt amperage).

I have no problems powering my LattePanda and it works great.

It's voltage limits I'm interested in for whole board (Vin min - Vin max) and I'm expecting answer like 4.9V - 5.5V.

Thanks.

Re: Absolute voltage limits for LattePanda

Posted: Tue May 24, 2016 9:42 pm
by nasosan2
schluej wrote:Moin Moin,
If you have a look in the spec http://www.intel.com/content/dam/www/pu ... -vol-1.pdf
You will see that the tolerance is only 2% (Page240). The Max Icc is interesting too, that will explain why so many people have problems. Wrong cable and/or power supply will cause the most problems.
is not true.. whit yours cable, and other 2 power supply the problem of blinking is the same.. (ps whit my second account it possible to reply message.. )

Re: Absolute voltage limits for LattePanda

Posted: Wed May 25, 2016 10:22 am
by schluej
nasosan2
Not absolutely wrong...
First the most mobile phones chargers are build to deliver 2.1 Ah.
If you will use a mobile phone charger you sound search for an USB 3.0 charger e.g. Quick Charge 3.0 AUKEY USB .
Second the cable is important too. With the wrong cable you will limit the current.
On Amazon i found Rampow USB and PortaPow cable both are AWG 20 cable.
And abel to transport 3Ah without loosing voltage. Check the voltage on the 5V connector CN2! if the voltage is constantly 5V than you are right otherwise...

Re: Absolute voltage limits for LattePanda

Posted: Wed Jun 01, 2016 1:45 am
by tasrock
For what it's worth:
My USB power supply was listed as 5.25V and 2.4A. It is actually supplying 5.6V according to the pins on CN2. LattePanda appears to work fine with that much voltage to this point.
https://www.adafruit.com/products/1995? ... Ahro8P8HAQ