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
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 (VDD1) to the
HCPL-0710 located in the
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.
transmit path is eliminated, a
RECESSIVE bus state is ensured
as the HCPL-0710 output voltage
(VO) goes HIGH.
AC LINE
NON ISO
5 V
NODE/APP SPECIFIC
uP/CAN
GALVANIC
ISOLATION
BOUNDARY
HCPL
0710
HCPL
0710
REG.
TRANSCEIVER
DRAIN/SHIELD
SIGNAL
V+ (SIGNAL)
V– (SIGNAL)
V+ (POWER)
V– (POWER)
POWER
NETWORK
POWER
SUPPLY
Figure 19. Isolated Node with Transceiver Powered by the Network.
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
