MPXV2010DP Designreview

[BTLede]

Hello Folks,

i would like to use 3 MPXV2010DP differential pressure sensors

I wanna use them to messure pressures up to 10kPa, which seems fine like the datasheet.

Now it is that the MPXV2010DP is giving out 0-25mV. To use this i want to amplify the Outputvoltage x 200, so i have a range from 0-5V, so i can read it out from an ADC.

For this i am using an operational amplifier as non-inverting amplifier.

Now it would be nice if you can check my schematic to see, if i am right or not.. Its my first time working with them and before i order my PCB i can change things before..

Thank you in advance!

[BTLede]

Hello Tomas!

thank you so much..

Yes, it seems like the MPX2010DP has an + and - output.. i started the design with an MPX5010DP and also created the footprint for it, and then i thought i could use the MPX2010DP since it has better tolerances.

But as you asume, it would be better to just use the MPX5010DP. But here i would need your help again:
When i use the MPX5010DP, i can delete the operational amplifier and give the signals directly into the ADC? That would be really really easy.. since i only need those 3 sensors.

[TomasVaverka]

Hello Thomas,

Yes, when using the MPX5010DP with a single ended and internally amplified output, there is no need for the external operational amplifier. The output voltage is typically in the range of 0.2V to 4.7V and can usually be directly connected to the ADC input. 

BRs, Tomas

[TomasVaverka]

Hello Thomas,

First of all, all 4 pins of the MPX2010DP needs to be connected as below:

Pin 1: GND
Pin 2: Positive Output Voltage
Pin 3: Voltage Supply (10V recommended)
Pin 4: Negative Output Voltage

The output of this sensor is differential and temperature compensated, which means that the sensor gives you a differential output in the range of millivolts (0-25mV). This differential output needs to be converted to a single ended output using an instrumentation amplifier (differential input amplifier). You can find some information about that e.g. in our old AN1318 (attached), but my recommendation would be using a single chip solution such as the INA122 instrumentation amplifier.

Alternatively, you can use an integrated pressure sensor MPX5010DP instead, it is already internally compensated, calibrated and amplified, so you do not need many external components other than few capacitors (as can be seen in Figure 11 of the MPX5010 datasheet) and the output is already given in the range of 0 to 5V, so it is much more easier to use than the MPX2010DP pressure sensor.

BRs, Tomas