A5191HRT Datasheet, PDF (1/13 Pages) AMI SEMICONDUCTOR – AMIS HART™ Modem

A5191HRT
HART Modem
1.0 Key Features
• Can be used in designs presently using the SYM20C15
• Single-chip, half-duplex 1200 bits per second FSK modem
• Bell 202 shift frequencies of 1200Hz and 2200Hz
• 3.3V - 5.0V power supply
• Transmit-signal wave shaping
• Receive band-pass filter
• Low power: optimal for intrinsically safe applications
• CMOS compatible
• Internal oscillator requires 460.8kHz crystal or ceramic resonator
• Meets HART physical layer requirements
• Industrial temperature range of -40°C to +85°C
• Available in 28-pin PLCC and 32-pin LQFP packages
2.0 Description
The A5191HRT is a single-chip, CMOS modem for use in highway addressable remote transducer (HART) field instruments and
masters. The modem and a few external passive components provide all of the functions needed to satisfy HART physical layer
requirements including modulation, demodulation, receive filtering, carrier detect, and transmit-signal shaping. The A5191HRT is pin-
compatible with the SYM20C15. See the Pin Description and Functional Description sections for details on pin compatibility with the
SYM20C15.
The A5191HRT uses phase continuous frequency shift keying (FSK) at 1200 bits per second. To conserve power the receive circuits
are disabled during transmit operations and vice versa. This provides the half-duplex operation used in HART communications.
Figure 1: 28-Pin PLCC Pin Out Diagrams (Green & Non-Green)
©2008 SCILLC. All rights reserved.
May 2008 – Rev. 3
Publication Order Number:
A5191HRT/D