4-20mA reduce components

juan camarasa

Other Parts Discussed in Thread: ISO1540, INA3221, RCV420, ADS1100

I'm currently using the rcv420, ads1100 and iso1540 to measure one 4-20mA input and feed the voltage value to one microcontroller (msp430). Now I'm want to mesure 4 inputs 4-20mA but using many components is not an option (cost, board space as well). By looking the ina3221 i guess is an option but I really want to now your opinion on this. The schematic of the current circuit is below:

over 8 years ago

0 Rabab Itarsiwala over 8 years ago

TI__Expert 4595 points

Hi Juan,
What is the bus voltage or the common mode voltage for the current source. What kind of application is this. INA3221 supports 0 to 26V common mode. It is a 3 channel device with digital output (I2C compatible).

0 juan camarasa over 8 years ago in reply to Rabab Itarsiwala

Intellectual 390 points

Rabab Itarsiwala
the common voltage is 24V (industrial application). The main application is sensor reading (4-20mA current loop)

Regards, Juan

0 Rabab Itarsiwala over 8 years ago in reply to juan camarasa

TI__Expert 4595 points

Hi Juan,

INA3221 can support bus supply from 0 to 26 V. Seems like you could use it. You will need an external shunt resistor per channel.

You can sample it here: INA3221_Samples.

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4-20mA reduce components