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Power saving on I2C communication

I have developed below I2C code with an RTC timer event handler to sample data from a sensor every 1s. This format is used mainly to save power.

I can see there is a base 300uA @ 3.3V is being consumed even when the sensor is in idle mode. 

This current is mainly due to this line of code: "twi_init();". When I comment this line, that 300uA current consumption is gone. 

How can I modify this code to save power and remove that base 300uA current.

 

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