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MMA8453 Transient detection

Question asked by George K on Jan 6, 2014
Latest reply on Jan 6, 2014 by Tomas Vaverka



In regards to reading the actual acceleration data of an MMA8453, would I need to take into consideration the reference gravitational force?  For example, in reference to Figure 3 in the MMA8453Q datasheet, the "SIDE, FRONT" view shows 1g in the Z direction. If the device is set for a transient detection value of 2g, would the device be triggered at a Z force of 2g, or 3g, since there is already a 1g force, due to gravity? Will the data in the Zout register read the actual value of the force, or will the data be compensated for according to the 1g reference?


Thanks in advance for your advice,