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Products Mentioned
ADXL327Production
The ADXL327 is a small, low power, complete 3-axis accelerometer with signal conditioned voltage outputs. The product measures acceleration with a minimum...
Datasheet ADXL327 on Analog.com
ADXL326Production
The ADXL326 is a small, low power, complete 3-axis accelerometer with signal conditioned voltage outputs. The product measures acceleration with a minimum...
Datasheet ADXL326 on Analog.com
ADXL325Production
The ADXL325 is a small, low power, complete 3-axis accelerometer with signal conditioned voltage outputs. The product measures acceleration with a minimum...
Datasheet ADXL325 on Analog.com
The user inquired about the internal connection of the 4 COM pins on the ADXL327 accelerometer and whether disconnecting one could cause x-axis output issues. The final answer confirmed that all COM pins must be connected to the same GND to prevent floating internal circuits and ensure stable output. The user observed the issue in one of three accelerometers (ADXL327, ADXL325, ADXL326) after 3 months of normal operation, affecting 2 out of 250 sets.
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Generally speaking, we would not have any reason to doubt this. Have you observed anything that would suggest otherwise? We would also suggest that all of COM pins be tied to a common point on the PCB, just out of "best engineering practices," if for no other reason.
Thank you! It might help to share more details on what you are observing. Perhaps some data or a plot of the unexpected behavior might be helpful. Is this on one unit only? Are other units, which have all of the pins grounded, behaving the way that you would expect?
All the COM pins of ADXL32x have to be connected to the same GND. If not, part of the internal circuit will be floating or say will cause the unfixed level, then the output will be unfixed too.
This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.
