Unfortunately, there is no such document.
The FXAS21002C is a low power device. The current consumption in Active mode is 2.7 mA.
In this case, I would recommend to transit from Active to Ready mode when no measurements are being made. This mode offers the user the ability to significantly reduce the current draw of the device while providing a fast transition into Active mode within 1/ODR + 5ms.
I hope this information helps.