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AMIS-30663_14 Datasheet, PDF (9/11 Pages) ON Semiconductor – High Speed CAN Transceiver | |||
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AMISâ30663
HIGH
TxD
LOW
CANH
CANL
Vi(dif) =
VCANH â VCANL
0,9V
0,5V
dominant
recessive
RxD
t d(TxDâBUSon)
t pd(recâdom)
0,3 x V33
t d(TxDâBUSoff)
td(BUSonâRxD)
t pd(domârec)
0,7 x V33
td(BUSoffâRxD)
Figure 7. Timing Diagram for AC Characteristics
+3.3 V
+5 V
V CC
V 33
100 nF
TxD
Generator
3
8
7
1 AMISâ
30663
6
CANH
CANL
RxD
4
20 pF
5
30 W
2
V REF
GND
6.2 k W
10 nF
6.2 k W
30 W
Active Probe
Spectrum Anayzer
47 nF
Figure 8. Basic Test Setâup for Electromagnetic Measurement
CANH
CANL
VCM =
0.5*(VCANH+VCANL)
V CMâstep
recessive
V CMâpeak
V CMâpeak
Figure 9. Commonâmode Voltage Peaks (see measurement setâup Figure 8)
http://onsemi.com
9
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