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© Semiconductor Components Industries, LLC, 2013
April, 2013 − Rev. 3
1 Publication Order Number:
EVBUM2180/D
AMIS-49200EVB
AMIS-492x0 Fieldbus MAU
Evaluation Board User's
Manual
Introduction
ON Semiconductor offers the AMIS-492x0 Fieldbus
Media Access Unit (MAU) as part of an overall industrial
network communication solution. Please refer to the
AMIS-492x0 data sheet for more information on this
integrated circuit. The scope of this user’s manual focuses
on a reference design and board that ON Semiconductor also
offers its customers, and which satisfies the Foundation
Fieldbus H1 or Profibus PA physical layer network
requirement.
This user’s manual helps the user design in the
AMIS-492x0 MAU, by referring to a usable board design
known to pass the Foundation Fieldbus Physical Layer
Conformance (Specification FF830, Rev 1.5).
The reference design discussed in this document also
includes additional flexible sub-circuits not discussed in the
AMIS-492x0 data sheet, that help the user optimally fit the
AMIS-492x0 to their application.
Fieldbus Node Description
Figure 1 shows a typical, complete node using the
AMIS-492x0.
Process
Sensor
Microprocessor,
I/O (A/D)
RAM ROM
Fieldbus or
Profibus Link
Controller
Reference Design in Figure 12 of Data Sheet
RXA
RXS
TXE
TXS
Fieldbus
Segment
Connection
+
-
Figure 1. Complete Fieldbus Device using AMIS-492x0
Discrete
Components
AMIS−492x0
Fieldbus MAU
PFAIL2
PFAIL1
Vo
V
SHUNT
A link controller is placed between a typical
microprocessor and the AMIS-492x0 MAU to provide
Manchester encoding and decoding of the data to be
transmitted or received, respectively. It may be possible to
program a high-end microprocessor to handle the
Manchester style data stream, but the effort to do so is likely
cost prohibitive.
One example of a suitable link controller is the
UFC100-F1 by Softing/Aniotek, Inc.
(http://www.softing.com/home/en/industrial-automation/p
roducts/foundation-fieldbus/device-integration/universal-f
ield-controller.php?navanchor=3010446)
AMIS-492x0 Fieldbus MAU Reference Design
ON Semiconductor has developed a reference design for
commercial use in a Foundation Fieldbus H1 or Profibus PA
application.
Figure 12 in the AMIS-492x0 data sheet shows an
example of external circuitry required to connect the
AMIS-492x0 to an IEC 61158-2 conformant network. That
schematic is of a circuit that passed the Foundation Fieldbus
Physical Layer Conformance test as specified in Foundation
Fieldbus Specification FF830, Rev 1.5.
There are many alternative designs and it is beyond the
scope of this document to identify all possible
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EVAL BOARD USER’S MANUAL
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