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MAX22191: Common vs Separate Field-Side Ground for 4 Digital Inputs

Thread Summary

The user asks if the GND pins of four MAX22191 devices should be tied to a common field ground or kept separate for a digital input module. The final answer states that if channel-to-channel isolation is required, each MAX22191 GND should be separate. If the inputs share a common field ground, the GND pins can be connected together.
AI Generated Content
Category: Hardware
Product Number: MAX22191

Hello,

I am designing an industrial system with four 24-V digital inputs (source/sink type), using one MAX22191 per input.

On the field side, should the GND pins of all MAX22191 devices be tied to a common sensor/field ground, or should each MAX22191 have a separate, individual field-side ground?

All inputs are part of the same digital input module, and the goal is correct operation while maintaining proper isolation .

Thank You