A5191HRTNG-XTP

Overview

The A5191HRTNG-XTP is a single-chip CMOS modem designed for Highway Addressable Remote Transducer (HART) field instruments and masters. It implements phase continuous frequency shift keying (FSK) at 1200 bits per second using Bell 202 shift frequencies of 1200 Hz and 2200 Hz. The device operates on a 3.0 V to 5.5 V power supply and supports half-duplex communication by disabling receive circuits during transmission. It integrates modulation, demodulation, receive filtering, carrier detect, and transmit-signal shaping functions. The component requires an external 460.8 kHz crystal or ceramic resonator for its internal oscillator and is available in a 32-pin QFN package.

Feature Summary

• Integrates complete HART physical layer functionality including FSK modulation and demodulation within a single chip
• Supports low-power operation suitable for intrinsically safe applications through half-duplex architecture
• Features internal oscillator compatible with standard 460.8 kHz ceramic resonators or external clock sources
• Includes dedicated carrier detect circuitry to ensure signal validity before data output

Applications

• HART multiplexers
• HART modem interfaces
• 4-20 mA loop powered transmitters

Procurement Notes

Verify the specific suffix 'N' corresponds to the 32-pin QFN package configuration as defined in the ordering information table. Confirm that the '-XTP' designation indicates tape and reel shipping with a quantity of 5000 units. Ensure the procurement documentation explicitly lists the industrial temperature range of -40°C to +85°C. Cross-reference the part number against the discontinuation notice for related PLCC variants to confirm current availability status.

Selection Notes

Select this component when designing HART slave interfaces requiring a compact 32-pin QFN footprint. Ensure the design accommodates the required 460.8 kHz external resonator and bias resistor network. Verify compatibility with 3.3 V or 5 V microcontroller logic levels. Consider the half-duplex nature of the interface for timing constraints between transmit and receive operations.

Part Context

This device belongs to the A5191HRT family of HART modems manufactured by onsemi. It provides a cost-effective solution for implementing HART protocol compliance in industrial automation equipment. The QFN variant offers a smaller surface area compared to the PLCC alternative, facilitating denser PCB layouts for modern instrumentation designs.

Replacement Considerations

Public confirmed substitute part numbers include NCN5192 and NCN5193. These devices serve similar HART modem functions but may require verification of pinout compatibility and specific electrical parameter alignment before implementation.