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All   >>  Energy Efficiency   >>   Industrial and Home Appliances   >>   Questions
 

We are planning to use the A5191HRT HART modem in a loop powered application. Using a nominal operating voltage between 2.8V and 2.9V for the device would greatly simplify design of the power regulation circuit. The device datasheet specifies a minimum operating voltage of 3.0V, however there are some application notes refering to a minimum operating voltage of 2.7V. Question is now: Is a reliable operation at a minimal voltage of 2.8V possible? Which drawbacks should be considered when using such a low supply?

The A5191HRT Industrial HART Modem will work fine at that voltage. While the device spec says 3V, it will work perfectly on slightly lower voltage. The important thing is to keep enough headroom for the internal opamps to operate at Vref + VHART. I have tested operation down to 2.5V, which worked fine (with a perfectly regulated power supply of course). Answered by:
ON Semiconductor
2013-09-26 10:20:38.556