©
Semiconductor Components Industries, LLC, 2016
July, 2016 − Rev. 5
1
Publication Order Number:
EVBUM2130/D
A5191HRTNGEVB
A5191HRTNGEVB
Evaluation Board User's
Manual
Introduction
The A5191HRTNGEVB evaluation board includes all
external components needed for operating the
A5191HRT IC and demonstrates the small PCB surface area
such an implementation requires. The EVB allows easy
design of HART
®
implementations using A5191HRT.
Overview
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 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.
Features
•
Single−chip, Half−duplex 1200 Bits per Second FSK
Modem
•
Bell 202 Shift Frequencies of 1200 Hz and 2200 Hz
•
3.0 V − 5.5 V Power Supply
•
Transmit−signal Wave Shaping
•
Receive Band−pass Filter
•
Low Power: Optimal for Intrinsically Safe Applications
•
Compatible with 3.3 V or 5 V Microcontroller
•
Internal Oscillator Requires 460.8 kHz Crystal or
Ceramic Resonator
•
Meets HART Physical Layer Requirements
•
Industrial Temperature Range of −40
°
C to +85
°
C
•
Available in 28−pin PLCC, 32−pin QFN and 32−pin
LQFP Packages
Applications
•
HART Multiplexers
•
HART Modem Interfaces
•
4 – 20 mA Loop Powered Transmitters
Figure 1. A5191HRTNGEVB Evaluation Board
www.onsemi.com
EVAL BOARD USER’S MANUAL
