Constant current source for piezoresistive sensor

Thread Starter

Spaken

Joined Mar 28, 2021
1
Hello.

I am trying to make a pressure sensor using a CS040 sensor. The manufacturer sent me a complicated constant current circuit to power the sensor, but I wonder if there is a simpler way to power it.

The sensor is piezoresistive. It outputs a voltage that varies with the pressure applied to the sensor. To get a consistent output voltage the input voltage and current needs to be constant. My question is; can I use a PSSI2021SAY constant current source instead of the circuit the manufacturer suggested? Will it deliver a current and voltage constant enough to get a consistent reading from the sensor? Or is the PSSI2021SAY not suitable for a load with varying resistance?

Thanks for any replies.
 

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