
Semiconductor Components Industries, LLC, 2014
February, 2014 Rev. 7
1
Publication Order Number:
A5191HRT/D
A5191HRT
HART Modem
Description
The A5191HRT is a singlechip, 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 transmitsignal 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 halfduplex operation used in HART communications.
Features
Singlechip, Halfduplex 1200 Bits per Second FSK Modem
Bell 202 Shift Frequencies of 1200 Hz and 2200 Hz
3.0 V 5.5 V Power Supply
Transmitsignal Wave Shaping
Receive Bandpass 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 28pin PLCC, 32pin QFN and 32pin LQFP Packages
These are PbFree Devices
Applications
HART Multiplexers
HART Modem Interfaces
4 20 mA Loop Powered Transmitters
http://onsemi.com
See detailed ordering and shipping information in the package
dimensions section on page
14 of this data sheet.
ORDERING INFORMATION
PLCC28
P SUFFIX
CASE 776AA
QFN32
N SUFFIX
CASE 488AM
LQFP32
L SUFFIX
CASE 561AB
MARKING DIAGRAMS
XXXXYZZ
A5191HRTPG
XXXXYZZ
A5191
HRTLG
A5191HRTxx = Specific Device Code
xx
= P (PLCC), L (LQFP) or N (QFN)
XXXX
= Date Code
Y
= Plant Identifier
ZZ
= Traceability Code
A
= Assembly Location
WL
= Wafer Lot
YY
= Year
WW
= Work Week
G or G = PbFree Package
(Top Views)
A5191
HRTNG
AWLYYWW
G
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