HCPL-0710 Datasheet, PDF (12/16 Pages) Agilent(Hewlett-Packard) – 40 ns Prop. Delay, SO-8 Optocoupler

Isolated Node with
Transceiver Powered by the
Network
Figure 19 shows a node powered
by both the network and another
source. In this case, the trans-
ceiver and isolated (network) side
of the two optocouplers are
powered by the network. The rest
of the node is powered by the AC
line which is very beneficial when
an application requires a
significant amount of power. This
method is also desirable as it does
not heavily load the network.
More importantly, the unique
“dual-inverting” design of the
HCPL-0710 ensures the network
will not “lock-up” if either AC line
power to the node is lost or the
node powered-off. Specifically,
when input power (V_DD1) to the
HCPL-0710 located in the
transmit path is eliminated, a
RECESSIVE bus state is ensured
as the HCPL-0710 output voltage
(V_O) goes HIGH.
NODE/APP SPECIFIC
uP/CAN
HCPL
0710
HCPL
0710
TRANSCEIVER
DRAIN/SHIELD
SIGNAL
POWER
NETWORK
POWER
SUPPLY
AC LINE
NON ISO
5V
REG.
GALVANIC
ISOLATION
BOUNDARY
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
Figure 19. Isolated Node with Transceiver Powered by the Network.