AN3745: In order to calibrate the MMA745xL 0g offset, the predetermined digital offset values should be subtracted from the reading of the actual digital sensing values.
AN3745, How to Calibrate 0g Offset for the MMA745xL Family - Application Notes
AN3745: In order to calibrate the MMA745xL 0g offset, the predetermined digital offset values should be subtracted from the reading of the actual digital sensing values.