AMIS-492X0 Datasheet, PDF (21/22 Pages) ON Semiconductor – Fieldbus MAU

AMIS-492x0
6.0 Ordering Information
Part Number
AMIS-49200-XTD
AMIS-49200-XTP
AMIS-49250-XTD
AMIS-49250-XTP
Package
44 LQFP 10x10mm (Green/RoHS Compliant)
44 LQFP 10x10mm (Green/RoHS Compliant)
44 NQFP 7x7mm (Green/RoHS Compliant)
44 NQFP 7x7mm (Green/RoHS Compliant)
Shipping Configuration
Tray
Tape & Reel
Tray
Tape & Reel
Temperature Range
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
7.0 Appendix (A) – Manchester Encoding
All Fieldbus devices transmit the data onto the media as a Manchester-encoded baseband signal. With Manchester encoding, zeros
and ones are represented by transitions that occur in the middle of the bit period (see below). For FOUNDATION Fieldbus H1 and
Profibus PA, the nominal bit time is 32μsec, with the transition occurring at 16μsec. The Manchester encoding rules have been
extended to include two additional symbols, non-data plus (N+) and non-data minus (N-). The symbol encoding rules are shown in
Figure 15.
32 usec
-T
T
2
2
Logical "0"
-T
T
2
2
Logical "1"
-T
T
2
2
"N+"
-T
T
2
2
"N-"
Figure 15: Manchester Encoding
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