A519HRT HART® Modem
■This application note describes a demonstration circuit that permits a user to implement a HART slave or master interface between a microprocessor and a process loop using the ON Semiconductor A5191HRT HART modem integrated circuit. The information in this Application Note is correct to the best of our knowledge. Development of a circuit suitable to the user's particular system and application environment is the responsibility of the user.
■The HART (Highway Addressable Remote Transmitter)communication protocol provides digital communication for microprocessor−based process control instruments.HART uses the Bell−202 forward channel signaling frequencies and bit rate (1200 bits/second) as making it a subset of the Bell−202 standard. HART−speaking devices can use virtually any Bell−202 standard modem. However,the ON Semiconductor A5191HRT single−chip modem has been designed to meet the low power requirements of 2−wire process instruments.
■The ON Semiconductor A5191HRT modem is designed to allow the user to easily implement a HART compliant Physical Layer design conforming to the HART FSK Physical Layer Specification. The A5191HRT is intended to replace the 20C15 for all existing and future HART applications with no circuit topology changes. Only the values of four external resistors in the receive filter need to be adapted.
●Features
■Same modem design as 20C15 from LSI Logic(formerly NCR and Symbios)
■Transmits a trapezoidal signal
■Internal oscillator cell
■Internal receive filter
■Carrier detect
■Available in 28−pin PLCC, 32−pin QFN and 32−pin LQFP Packages
■These Devices are Pb−Free and are RoHS Compliant
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Application note & Design Guide |
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Please see the document for details |
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PLCC;QFN;LQFP |
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English Chinese Chinese and English Japanese |
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2021/8/6 |
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Rev. 4 |
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AND8346/D |
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459 KB |
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