How to differentiate adxl355 and adxl357 from digital interface

Question

Dear Forum 
 When the parts are in service. Is there a way to differentiate which part it actualy is, using the digital interface. Checking the datasheet I do not see any difference on the registers. Are there some hidden registers not documented which could be used to read from the part and determine if it is an adxl355 or an adxl357? 
 Any answers are warmely welcome. 
 
 Regards 
 This

PdelCorro · Answer

Hi, 
 Unfortunately, there is no digital way to distinguish these two parts. The only way is visual inspection. 
 Regards, 
 Pablo.

AndrewC · Answer

I see this was a while back, but I thought I would share my experience with this. 
 I had this exact issue about 5 years ago in trying to differentiate between the parts. It is a shame that ADI did not take the (what seems incredibly obvious) opportunity to use the PartID register. Anyway, the way I solved it was to take a series of readings from the accelerometer at start-up and calculate the total applied g (the root-sum-squares of the three axes). 
 Assuming that the sensor is relatively stationary at turn-on (which I could assume for my application), the value obtained could be used to discern which sensor is fitted, since the ADXL357 would return a number five times smaller than the ADXL355 (five times great range, so "1g" would give a number fiver times smaller). 
 I took 16 samples to reject noise and any smallish spikes, but depending on the application you could probably get away with fewer. 
 Hope this helps!

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How to differentiate adxl355 and adxl357 from digital interface