MCP2551
2.1.5
DIFFERENTIAL VOLTAGE, VDIFF
(OF CAN BUS)
2.0
2.1
ELECTRICAL
CHARACTERISTICS
Differential voltage of the two-wire CAN bus, value
VDIFF = VCANH – VCANL.
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.
2.1.6
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).
2.1.1
BUS VOLTAGE
VCANL and VCANH denote the voltages of the bus line
wires CANL and CANH relative to ground of each
individual CAN node.
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).
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 up to the maximum number of CAN nodes are
connected to the bus.
FIGURE 2-1:
PHYSICAL LAYER
DEFINITIONS
ECU
2.1.3
DIFFERENTIAL INTERNAL
CAPACITANCE, CDIFF
(OF A CAN NODE)
RIN
RIN
CANL
Capacitance seen between CANL and CANH during
the Recessive state when the CAN node is
disconnected from the bus (see Figure 2-1).
CDIFF
RDIFF
CANH
CIN
CIN
2.1.4
DIFFERENTIAL INTERNAL
RESISTANCE, RDIFF
(OF A CAN NODE)
GROUND
Resistance seen between CANL and CANH during the
Recessive state when the CAN node is disconnected
from the bus (see Figure 2-1).
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DS20001667G-page 7
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