Reduce power consumption in the SD card.

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I am using micro SD card to log data from sensor. It logs data every 15 minutes and then goes to sleep. I am using MSP430G2553 uc from TI. I am using 1000 mAh battery, still battery is not lasting for a week. While the uc sleeps, micro SD card continuously consumes power. Is is possible to reduce power consumption drastically, without changing schematic. Schematic and code is attached below.

Regards,
Tapas

Datalogger_Schematic.JPG
View attachment Code_Datalogger_msp430g2553.txtView attachment Code_Datalogger_msp430g2553.txt
 
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