Abstract
In smart transmitters with HART protocol, the HART physical layer implementation is critical for reliable communication. For the existing smart pressure transmitter circuit is complex and unstable, this paper designed a simple and reliable circuit in accordance with HART physical layer specifications. The design uses AD421 and AD5700-1 constitute a 4-to-20mA loop-powered smart transmitter circuit, is fully compatible with standard HART or other similar FSK protocols. The smart transmitter using this circuit has passed the HART certification by HART communication foundation. This implementation can be applied to other smart transmitters.
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