I'm working with a MEMS Accelerometer, specifically the MS 3028. In it, the sensitivity is given as the following:

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That seems like exceptionally large variation in sensitivity. I am aware that this value varies with temperature and input voltage, but it is given that "All values are typical at +24°C, 80Hz and 5Vdc excitation unless otherwise stated", which per my understanding means a constant temperature and input voltage.

I do not understand whether there is a factor that I have missed that justifies this level of variation, or how to determine a "normal" value for my simulation of the 3028.

enter image description here

Please let me know if more information is required.


1 Answer 1


Apparently a Wheatstone bridge in a MS 3028 accelerometer uses something called an Excitation Voltage. Read more about it in section one of this ti.com paper.

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In the MS 3028 specification you linked to, several lines below the mV/g Sensitivity line you copied into the question, there is a line that specifies the excitation voltage range. As an example, the range for a 3028 which has a range of 2g (first column of the specification) is 2 Volts to 10 Volts.

In the MS 3028 specification, there is a foot not (foot note 1) next to the Sensitivity line in the table:

1 Output is ratiometric to excitation voltage

This website describes this as:

The actual output of these instruments is directly proportional, or ratiometric, to the excitation voltage. This means that if the excitation fluctuates, the output will change proportionally. As a result of this dependence on a steady excitation voltage, regulated power supplies are highly recommended.

Apparently, if the Excitation Voltage is regulated, the mV/g Sensitivity value will vary less.


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