AC LINE
NODE/APP SPECIFIC
uP/CAN
LOCAL
NODE
SUPPLY
GALVANIC
ISOLATION
BOUNDARY
HCPL
0710
HCPL
0710
5 V REG.
TRANSCEIVER
DRAIN/SHIELD
SIGNAL
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
POWER
NETWORK
POWER
SUPPLY
Figure 17. Typical DeviceNet Node.
Implementing DeviceNet
and SDS with the
HCPL-0710
With transmission rates up to 1
Mbit/s, both DeviceNet and SDS
are based upon the same
broadcast-oriented, communica-
tions protocol — the Controller
Area Network (CAN). Three types
of isolated nodes are
recommended for use on these
networks: Isolated Node Powered
by the Network (Figure 18),
Isolated Node with Transceiver
Powered by the Network (Figure
19), and Isolated Node Providing
Power to the Network
same ground reference. Yet, all
components are still powered by
the network. This node contains
two regulators: one is isolated and
powers the CAN controller, node-
specific application and isolated
(node) side of the two optocoup-
lers while the other is non-
(Figure 20).
Isolated Node Powered by the
Network
This type of node is very flexible
and as can be seen in Figure 18,
is regarded as “isolated” because
not all of its components have the
isolated. The non-isolated
regulator supplies the transceiver
and the non-isolated (network)
half of the two optocouplers.
NODE/APP SPECIFIC
uP/CAN
ISOLATED
SWITCHING
POWER
GALVANIC
ISOLATION
BOUNDARY
HCPL
0710
HCPL
0710
SUPPLY
REG.
TRANSCEIVER
DRAIN/SHIELD
SIGNAL
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
POWER
NETWORK
POWER
SUPPLY
Figure 18. Isolated Node Powered by the Network.
HP [ HEWLETT-PACKARD ]
