P82C150AHT datasheet(25/36 Pages) PHILIPS

25 / 36 page

1996 Jun 19

Philips Semiconductors

Preliminary speciﬁcation

CAN Serial Linked I/O device (SLIO) with

digital and analog port functions

P82C150

11 APPLICATION INFORMATION

11.1

Maximum bus length

The bit timing parameters refer to using a P8xCE598 or

P8xC592 microcontroller with on-chip CAN interface as a

host node (see Fig.20).

11.1.1

ASSUMPTIONS

• The total in/out delay of external transceiver circuit is

less than 180 ns (e.g. PCA82C250 CAN transceiver;

see Fig.20).

• The propagation delay on the transmission medium is

5.0 ns/m.

Table 15 Maximum bus length for CAN-bus systems with P82C150 nodes.

Notes

1. tprop is the maximum propagation delay between two CAN-bus nodes (delays of on- and off-chip transceiver circuits

included).

2. BTR0 and BTR1 (hex values) are particular configuration registers referring to bit timing.

BIT RATE

(kbit/s)

tprop(1)

(

µs)

INDICATION

FOR MAXIMUM

BUS LENGTH

(m)

BIT TIMING (P8xCE598/P8xC592)

fCLK

(MHz)

BTR0(2)

BTR1(2)

125

0.8

C5H

34H

100

C7H

34H

145

CFH

34H

445

E7H

34H

11.2

Start up sequence

The following start-up sequence, illustrated by

Figures 10 and 11, shows a simple example how

P82C150 nodes can be controlled from a host node. This

application example works with different system

configurations:

• One conventional crystal-controlled CAN node and one

or more P82C150 nodes.

• More than one conventional crystal-controlled CAN

node and one or more P82C150 nodes.

Fig.10 General start-up procedure for CAN-bus

systems with P82C150 nodes.

handbook, halfpage

Power-on

MHA077

Initialization of host node's CAN controller

Wait until all P82C150 nodes are assumed

to have finished Power-on-reset

Periodic calibration

(transmit calibration message with a

repetition period of maximum 8000 bit times)

Start-up bit time calibration procedure

(1)

(1) See Fig.11.

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