MEMS and Sensors
iMEMS® Accelerometers
iMEMS® Gyroscopes
Analog Temperature Sensors
Digital Temperature Sensors
Techniques for Improving Resolution in Tilt and Inertial
A/D converter resolution
 

Given a 5V reference and a 500mV/g accelerometer

A/D Bits Resolution g's per bit Degrees/bit
8 Bits 19.5mV/bit 39mg 2.3
10 Bits 4.88mV/bit 10mg 0.6
12 Bits 1.22mV/bit 2.4mg 0.14
 

Accelerometer offsets can limit resolution

Accelerometer signal can be amplified, but initial zero g offset is also amplified

Low cost accelerometers have initial offset equal to full scale

HW offset trimming is required even for moderate amplification

 
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