Philips Semiconductors
PCA82C250 / 251 CAN Transceiver
Application Note
AN96116
Table 6 Maximum bus cable length for different cables and number of nodes (n)
1
2
Cable Type
L
(k
= 0,2)
L
(k
= 0,1)
sm
max
sm
max
n = 32
n = 64
n = 100
n = 32
n = 64
n = 100
TM
DeviceNet (thin cable)
and/or ISO 11898 cable
200 m
170 m
150 m
230 m
200 m
170 m
TM
DeviceNet (thick cable)
800 m
360 m
550 m
690 m
310 m
470 m
600 m
270 m
410 m
940 m
420 m
640 m
810 m
360 m
550 m
700 m
320 m
480 m
2
0.5 mm (or AWG 20)
2
0.75 mm (or AWG 18)
1. Calculated with V
2. Calculated with V
= 1.0 V and a safety margin of k
= 1.0 V and a safety margin of k
= 0.2
= 0.1
th.max
th.max
sm
sm
Note: If driving more than 64 bus nodes and/or more than 250 m bus length the accuracy of the V
supply volt-
CC
age for the PCA82C251 is recommended to be 5% or better. The PCA82C250 needs a supply voltage of at least
4.75V when driving 50 Ω load, i.e. 64 bus nodes, and at least 4.9V when driving 45 Ω load, i.e. 100 bus nodes.
21
NXP [ NXP ]
