MCP2557FD datasheet(9/36 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

DS20005533A-page 9

MCP2557FD/8FD

2.0

ELECTRICAL

CHARACTERISTICS

2.1

Terms and Definitions

A number of terms are defined in ISO/DIS-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

VCANL and VCANH denote the voltages of the bus line

wires CANL and CANH relative to the ground of each

individual CAN node.

2.1.2

COMMON MODE BUS VOLTAGE

RANGE

Boundary voltage levels of VCANL and VCANH with

respect to ground, for which proper operation will occur,

if the maximum number of CAN nodes are connected

to the bus.

2.1.3

DIFFERENTIAL INTERNAL

CAPACITANCE, CDIFF

(OF A CAN NODE)

Capacitance seen between CANL and CANH during

the

Recessive

state

when

the

CAN

node

disconnected from the bus (see Figure 2-1).

2.1.4

DIFFERENTIAL INTERNAL

RESISTANCE, RDIFF

(OF A CAN NODE)

Resistance seen between CANL and CANH during the

Recessive state when the CAN node is disconnected

from the bus (see Figure 2-1).

2.1.5

DIFFERENTIAL VOLTAGE, VDIFF

(OF CAN BUS)

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

equal to VDIFF =VCANH –VCANL.

2.1.6

INTERNAL CAPACITANCE, CIN

(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 Figure 2-1).

2.1.7

INTERNAL RESISTANCE, RIN

(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 Figure 2-1).

FIGURE 2-1:

PHYSICAL LAYER

DEFINITIONS

RIN

RDIFF

CIN

CDIFF

CANL

CANH

GROUND

ECU

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