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[AD421] current loop issue

Question asked by Gbriantais on Oct 30, 2015
Latest reply on Nov 2, 2015 by Gbriantais

Hi everyone,

 

i've an issue with the AD421 in 4/20mA mode, powered at 3.3V.

 

ad421.jpg

I'm using a microchip DN2530 FET transistor.

 

I've always 16.6mA accross R2, regardless the current order from my microcontroller, when i power-up the AD421 i've 16.6mA and then... no reaction...

My SPI communication seems correct.

 

Any ideas?

Thanks in advance.

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