Accelerometer sensitivity range
Page 54: 


  BRES determines the resolution of the acceleration data samples collected by the sample 
  buffer.
  BUF_RES = 0 
  
  8-bit samples are accumulated in the buffer
  
  BUF_RES = 1 
  
  16-bit samples are accumulated in the buffer


Page 7:


  Current consumption: High resolution mode 145 uA typical, Low power mode 10 uA typical.
  Bandwidth: High resolution mode ODR/2, Low power mode 800 Hz.


On page 8 there are also diagrams which shows how the start up time and representative current. This is very much affected by the ODR (Output Data Rate). Higher output data rate gives a higher current consumption and longer start up time.

The ODR is set by register ODCNTL bit0 to bit3, seen in Table 21, page 43. This table also shows which data rates are available for low power mode. Note that the Directional Tap feature data rate is handled by another register.