How to interface 200mA current output High Pressure sensor to PIC ADC?

[unhappy]

I am in need to use MLH series High pressure sensor of Honeywell make to interface with PIC16F887. Can anyone suggest basic electronics circuit to be used Here.
Note Sensor gives ratio-metric output from 0 to 200mA

 

[d123]

Hi,

Your PIC has an ADC. One option could be an op amp current to voltage converter between the sensor and the ADC.

 

[unhappy]

Hi,

Your PIC has an ADC. One option could be an op amp current to voltage converter between the sensor and the ADC.

Any working example??

 

[KlausST]

Hi,

All depends on voltage and current.
So we know the current..but we don't kniw what the valid input voltage range is.

Let's say it's 0..3V then you just need to select a resistor according Ohm's law to generate 3V @ 200mA

Then you say ratiometric....so the output proportionally depends on the input. We have no information what this "input" is.
Is it voltage or current? What range?

To measure ratiometric values...a good solution is to feed the sensor "input" infirmation to the ADC_Reference.
Low pass filtered, properly decoupled with a capacitor ... with identical time constant as the sensor_output_to_ADC.

As so often: a picture says more than thousand words. What about a (hand drawn) schematic?

Klaus

 

[betwixt]

200mA is an unusually high current, the industry standard is 4mA to 20mA (zero to full scale). Check the value before going further as it would make a huge difference to the interface design.

Brian.

 

[FvM]

Datasheet says

The MLH Series has six standard output options:
• Ratiometric: 0.5 Vdc to 4.5 Vdc from 5 Vdc excitation
• Current: 4 mA to 20 mA
• Regulated: 1 Vdc to 6 Vdc
• Regulated: 0.25 Vdc to 10.25 Vdc
• Regulated: 0.5 Vdc to 4.5 Vdc
• Regulated: 1 Vdc to 5 Vdc

Heavy Duty Pressure Transducers, PX3 Series, 1 bar to 46 bar | 15 psi to 667 psi (honeywell.com)

 

[unhappy]

Datasheet says

Heavy Duty Pressure Transducers, PX3 Series, 1 bar to 46 bar | 15 psi to 667 psi (honeywell.com)

@ Brian
I am sorry my mistake Datasheet says
The MLH has standard output options:
A. 0.5 Vdc to 4.5 Vdc ratiometric output from 5 Vdc excitation
B. 4 mA to 20 mA current from 5 Vdc to 30 Vdc excitation

 

[danadakk]

Basic application note for Ratiometric -

http://www.sensorica.ru/pdf/1_doc_7.pdf

http://www.maximintegrated.com/en/design/technical-documents/app-notes/3/3775.html

Regards, Dana.