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Low power mode MMA8451Q

Question asked by Algis A on Jan 29, 2014
Latest reply on Feb 3, 2014 by Tomas Vaverka


I'm using MMA8451 and setting these registers: 0x0F <- 0x01 (High pass filter 1Hz); 0x2B <- 0x1B(Low power mode); 0x2A<-0xB1 (Sampling rate 6.25Hz), I am sending the data to registers in the order as it is written here. CA0 is directly connected to the ground. However the current is around 15mA. Can you advice me how  can I get those 6uAmps or so? Did I miss some other registers? I have made my own PCB and I used schematic as in MMA8451Q.pdf just instead of 4,7uF I use 6.8uF. I suppose that is not the reason for high current.
By the way I am reading data from accelerometer at around 20kHz.