lpcware

typical SD card power consumption?

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by fierz on Tue Feb 05 14:48:19 MST 2013
Aloha!

we are using a micro SD card for data storage in our battery operated device. I am using red suite 4.0, and building on the efsl lib. While testing the power consumption of our device under various circumstances, I noticed that it is using about 110mW (30mA at 3.7V) more when the SD card is inserted - that's 15% of the total device power consumption and this seems a bit excessive to me. I am writing about 1KB / minute to the card.

I have two questions:
1) does this power consumption only seem excessive to me, or is that just what an SD card needs
2) if the answer is no to the first question, what are typical ways of reducing SD card power consumption? Is efsl not optimized? Should I lower the SSP clock? Is it a hardware bug by my electronics engineer??

cheers
  Martin

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