MCP25612FD datasheet(11/26 Pages) MICROCHIP

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DS20005409A-page 11

MCP25612FD

2.3

Terms and Definitions

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.

2.3.1

BUS VOLTAGE

VCANLX and VCANHX denote the voltages of the bus line

wires, CANLx and CANHx, relative to the ground of

each individual CAN node.

2.3.2

COMMON-MODE BUS VOLTAGE

RANGE

Boundary voltage levels of VCANLX and VCANHX, with

respect to ground, for which proper operation will occur

if up to the maximum number of CAN nodes are

connected to the bus.

2.3.3

DIFFERENTIAL INTERNAL

CAPACITANCE, CDIFF

(OF A CAN NODE)

Capacitance seen between CANLx and CANHx

during the Recessive state, when the CAN node is

disconnected from the bus (see Figure 2-6).

2.3.4

DIFFERENTIAL INTERNAL

RESISTANCE, RDIFF

(OF A CAN NODE)

Resistance seen between CANLx and CANHx, during

the Recessive state, when the CAN node is

disconnected from the bus (see Figure 2-6).

2.3.5

DIFFERENTIAL VOLTAGE, VDIFFX

(OF CAN BUS)

Differential voltage of the two-wire CAN bus value:

VDIFFX =VCANHX –VCANLX.

2.3.6

INTERNAL CAPACITANCE, CIN

(OF A CAN NODE)

Capacitance seen between CANLx (or CANHx) and

ground, during the Recessive state, when the CAN

node is disconnected from the bus (see Figure 2-6).

2.3.7

INTERNAL RESISTANCE, RIN

(OF A CAN NODE)

Resistance seen between CANLx (or CANHx) and

ground, during the Recessive state, when the CAN

node is disconnected from the bus (see Figure 2-6).

FIGURE 2-6:

Physical Layer Definitions.

RIN

RDIFF

CIN

CDIFF

CANLx

CANHx

GROUND

ECU

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