Hello, at this moment I am working with these sensors.My question is the following:
- According to the technical data sheet, the output voltage is radiometric to 1.8 [V]. Then, the values delivered by the sensor range from -1.8 to 1.8 [V], where 0 equals 0 [g]? Or the values it delivers range in scale from 0 to 1.8 [V], being 0.9 [V] equivalent to 0 [g]?
According to the technical data sheet, the sensitivity is radiometric to V1P8ANA = 1.8 [V], to better explain my doubt, the voltage scale delivered by the sensor ranges from -1.8 to 1.8 [V] or 0 to 1, 8 [V].
In my case I use the scale of +/- 10 [g], therefore the sensitivity I get is 80 mV / g.
Please, I need to know what scale the sensor uses if it is radiometric.
Thank you for your post. It couldn't be -1.8V to +1.8V, as there is no -1.8v supply to support such an assumption. I will review the datasheet and documentation that I have access to, in order to answer your question more directly.
The ADXL356 datasheet, Table 1, the scale factors are defined for a specific voltage and are identified as ratiometric, with V_1p8ANA voltage.
NOTE: click on image for sharper resolution
This reference, also from Table 1 (ADXL356), seems to indicate that 0g relates to V_1P8ANA/2.
If I look at the sensitivity numbers for each range, they seem to correlate with V1P8ANA = 1.8V.
For example, the nominal sensitivity, for the +/-40g, is 20mV/g. When we multiply 80g (+/-40g) by 20mV, we arrive at 1.6V, which provides 0.2V of headroom to accommodate offset and sensitivity variation.
Do these insights help?