INA169: INA169

Paolo Motta

Part Number: INA169
Other Parts Discussed in Thread: REF200,

Hi,finally i made circuit with ina 169 as in my previous post.

Ina169 10mR shunt RL 33K2 with 10nF cap in parallel REF200 an OPA as buffer.

I have a "calibration" resistor of 100R and Vin 12V so I = 0,12A i read with tester and ADC 2,94Volts at the output of OPA . I think the expected/correct value is 3,359xxxxx

where i made mistake?

Ps: REF200 input is connected to +5V

Thanks

Paolo

over 6 years ago

0 Patrick Simmons over 6 years ago

TI__Mastermind 24275 points

Hello Paola,

Thanks for considering to use Texas Instruments. If you disconnect the OPA and probe at the REF200, 50K node, what voltage do you see?

0 Paolo Motta over 6 years ago in reply to Patrick Simmons

Prodigy 90 points

Hi,

in picture there are values of voltage i read, This is the schematics i used ijn my application. As you see after OPA i read correct value but after protection circuit i have voltage drop.

I made mistake ? Can you explain ?

Adc is a input channel of PIC16F877A

Thanks PAOLO