How to differentiate adxl355 and adxl357 from digital interface

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!

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!