Microchip Technology MCP2551-E/SN Linear IC MCP2551-E/SN Data Sheet

© 2010 Microchip Technology Inc.

DS21667F-page 7

A number of terms are defined in ISO-11898 that are
used to describe the electrical characteristics of a CAN
transceiver device. These terms and definitions are
summarized in this section.

2.1.1

BUS VOLTAGE

V

CANL

 and V

CANH

 denote the voltages of the bus line

wires CANL and CANH relative to ground of each
individual CAN node.

2.1.2

COMMON MODE BUS VOLTAGE 
RANGE

Boundary voltage levels of V

CANL

 and V

CANH

 with

respect to ground, for which proper operation will occur,
if up to the maximum number of CAN nodes are
connected to the bus.

2.1.3

DIFFERENTIAL INTERNAL 
CAPACITANCE, C

DIFF

 

(OF A CAN NODE)

Capacitance seen between CANL and CANH during
the Recessive state when the CAN node is
disconnected from the bus (see 

).

2.1.4

DIFFERENTIAL INTERNAL 
RESISTANCE, R

DIFF

 

(OF A CAN NODE)

Resistance seen between CANL and CANH during the
Recessive state when the CAN node is disconnected
from the bus (see 

2.1.5

DIFFERENTIAL VOLTAGE, V

DIFF

 

(OF CAN BUS)

Differential voltage of the two-wire CAN bus, value
V

DIFF

 = V

CANH

 - V

CANL

.

2.1.6

INTERNAL CAPACITANCE, C

IN

 

(OF A CAN NODE)

Capacitance seen between CANL (or CANH) and
ground during the Recessive state when the CAN node
is disconnected from the bus (see 

).

2.1.7

INTERNAL RESISTANCE, R

IN

 

(OF A CAN NODE)

Resistance seen between CANL (or CANH) and
ground during the Recessive state when the CAN node
is disconnected from the bus (see 

).

R

IN

R

IN

R

DIFF

C

IN

C

IN

C

DIFF

CANL

CANH

GROUND

ECU