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Implement HART communication with DAC8760

Posted: 28 Jul 2014  Print Version  Bookmark and Share

Keywords:DAC87x0  DACs  voltage  HART  Frequency shift keying 

The DAC87x0 is a family of single-channel, 16bit DACs with voltage and current outputs. The voltage outputs can be configured to one of four possible voltage ranges; (1) 0 V to 5 V, (2) 0 V to 10 V, (3) –5 V to 5 V (4) –10 V to 10 V, whereas the current outputs can be set to three possible ranges; (1) 4 mA to 20 mA, (2) 0 mA to 20 mA, and (3) 0 mA to 24 mA.

HART is defined by the HART Communication Foundation as a bi-directional communication protocol that provides data access between intelligent field instruments and host systems. It was developed in the mid 1980's and has been increasingly adopted in process control instrumentations systems. Frequency shift keying (FSK) is used to communicate at 1200 bit/s with 1.2kHz and 2.2kHz used to represent binary 1 and binary 0 values, respectively. The FSK signal is superimposed over a 4-mA to 20-mA analogue signal.

The DAC8760 can be configured in three different ways for HART communication; (1) CAP2 configuration, (2) HART-IN configuration, and (3) ISET-R configuration. For all three configurations, the DC level of the DAC current is unaffected by the modulating HART signal.

View the PDF document for more information.

Originally published by Texas Instruments Inc. at www.ti.com as "Implementing HART Communication with the DAC8760 Family".





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