CMOS modem IC for HART industrial communications

16th June 2014
Nat Bowers

Designed for highway addressable remote transducer (HART) industrial communication implementations, a single-chip CMOS modem IC has been unveiled by ON Semiconductor. The NCN5193 supports Bell 202 shift frequencies of 1200-2200Hz and is capable of delivering a 1200bps half-duplex data rate.

With a built-in power amplifier, a 17-bit sigma-delta DAC and an extremely responsive watchdog mechanism, it presents engineers with a very sophisticated HART solution, that is both cost-effective and space saving. It has a voltage range of 3V-5.5V and draws only 190µA while in standby mode with the system clock running (76µA with no clock). In order to keep its power budget to a minimum the receive circuitry is disabled during transmission phases and, likewise, the transmit circuitry is disabled when the IC is in the process of receiving.

The modem IC has an operational temperature range that spans from -40 to +85°C, allowing it to be deployed in industrial environments. Thanks to the high level of integration offered by the NCN5193, only a small number of external component parts are required. The NCN5193GEVB evaluation board, which includes all external components necessary for operation, helps to ease the design of HART implementations using the NCN5193.

Ryan Cameron, Vice President, Industrial and Timing Products, ON Semiconductor, commented: “We are delighted to now be featured as a member of the HART Foundation and are well positioned to contribute to the eco-system that is continuing to build up around the HART standard. The NCN5193 underlines our on-going commitment to developing next generation slave and master devices which will facilitate further proliferation of HART based communication in the future. It ensures reliable performance in an application where communication interrupts can often lead to crippling operational cost penalties.”

The NCN5193 is offered in a compact, lead-free, 32-pin QFN package and priced at $2.31 (USD) each in 10,000 unit quantities.

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