MCP2551

DS21667C-page 4

Preliminary

 2002 Microchip Technology Inc.

TABLE 1-1:

MODES OF OPERATION

TABLE 1-2:

TRANSCEIVER TRUTH TABLE

FIGURE 1-1:

SLEW RATE VS. SLOPE-CONTROL RESISTANCE VALUE

Mode

Standby

Slope-Control

High-Speed

TXD

CANH

CANL

Bus State(1)

4.5V

0

HIGH

LOW

Dominant

0

1 or floating

Not Driven

Not Driven

Recessive

1

X

Not Driven

Not Driven

Recessive

1

(See Note 3)

0

HIGH

LOW

Dominant

0

1 or floating

Not Driven

Not Driven

Recessive

1

X

Not Driven

Not Driven

Recessive

1

XX

Not Driven/

No Load

Not Driven/

No Load

High Impedance

X

Note 1: If another bus node is transmitting a dominant bit on the CAN bus, then RXD is a logic 0.

2: X = “don’t care”.

3: Device drivers will function, although outputs are not guaranteed to meet the ISO-11898 specification.

0

5

10

15

20

25

10 20 30 40 49 60 70 76 90 100 110 120

Resistance (k

Ω)