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[ 5 posts ] |
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Carambola 2 - supply voltage tolerance
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FPeter
Joined: 21 Aug 2013, 21:21
Posts: 101
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Hi All!
Specs of Carambola 2 states that supply voltage is 3.3V. Are there anything on the 3.3V line that not tolerates up to 3.6V? Based on their documentations, the flash is 2.7-3.6V tolerant, VDD33 line of AR9331 is 2.97-3.63V tolerant, DDR2 chip runs from 1.8V so it doesnt matter...
Im planning to connect a SIM5320E USB 3G modem to this board (via USB 2.0 Hi-Speed hub due to hw bug, and i need more ports too), but this modem runs from 3.4-4.2V, so the common supply voltage would be ideal somewhere between 3.5 and 3.6V - if the Carambola 2 module tolerates it...
Best regards,
Peter
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| 21 Aug 2013, 21:59 |
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gedass
Joined: 07 Dec 2011, 16:01
Posts: 525
Location: Lithuania
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Hi,
you can connect power supply to Carambola via 1 or 2 1A diodes.
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| 22 Aug 2013, 08:26 |
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FPeter
Joined: 21 Aug 2013, 21:21
Posts: 101
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| 22 Aug 2013, 11:23 |
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gedass
Joined: 07 Dec 2011, 16:01
Posts: 525
Location: Lithuania
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Then use additional 3.3V DC/DC only for Carambola module if you want to have professional solution.
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| 22 Aug 2013, 14:47 |
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FPeter
Joined: 21 Aug 2013, 21:21
Posts: 101
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| 22 Aug 2013, 21:56 |
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