User Manual

© 2010 Microchip Technology Inc. DS21667F-page 11
MCP2551
FIGURE 2-1: TEST CIRCUIT FOR ELECTRICAL CHARACTERISTICS
FIGURE 2-2: TEST CIRCUIT FOR AUTOMOTIVE TRANSIENTS
FIGURE 2-3: HYSTERESIS OF THE RECEIVER
RS
Rext
GND
RXD
V
REF
TXD
60 Ω
100 pF
30 pF
CANH
CANL
CAN
Transceiver
Note: RS may be connected to VDD or GND via a load resistor depending on desired
operating mode as described in Section 1.7.3 “Supply Voltage (V
DD
)”.
0.1µF
V
DD
RS
Rext
GND
RXD
V
REF
TXD
60Ω
500 pF
500 pF
Note: RS may be connected to VDD or
GND via a load resistor depending
on desired operating mode as
described in Section 1.7.8 “Slope
Resistor Input (Rs)”.
CANH
CANL
CAN
Transceiver
Schaffner
Generator
The wave forms of the applied transients shall be in accordance with “ISO-7637, Part 1”, test pulses 1, 2, 3a and 3b.
VOH
VOL
0.5 0.9
hysteresis
D19
V
DIFF (V)
RXD (receive data
output voltage)
VDIFF (r)(i)
VDIFF (d)(i)