© 2007 Microchip Technology Inc.

DS21667E-page 11

MCP2551

FIGURE 2-2:

TEST CIRCUIT FOR AUTOMOTIVE TRANSIENTS

FIGURE 2-3:

HYSTERESIS OF THE RECEIVER

Rext

GND

RXD

TXD

60

Ω

500 pF

500 pF

Note:

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.

0.5

0.9

hysteresis

D19

Vdiff (V)

RXD (receive data

output voltage)