I'm trying to interface an mma7361L accelerometer (on breakout board with caps) to the analog inputs of an 18f46k20. According to the PIC datasheet, the Vmax input voltage is Vdd + 0.3 which means I have to get the signal between 0V – 3.6V.
I only need to measure the Z-axis and from what I can tell it produces 850mV/g but I don't know if that's centered at an already offset voltage, or at zero. Does anyone here have experience with this chip? If so, what kind of signal conditioning do you recommend if any?
Many thanks.
Best Answer
I didn't used the device. But I can answer one part of your question.
When you take a look at page 3 of the datasheet under
Output Signal
you see a value forZero-g
thats typically 1.65 volts for VDD = 3.3V. Even more detail is given in footnote 5 on the same page:So yes, the output signals is centered.