Civil Engineering Reference
In-Depth Information
Fig. 2.56
Receiver compara-
tors to receive the data and
detect bus failures`
ten nodes are in the network and two nodes have 500 Ω, the value for the termina-
tion resistors of the other nodes is 1,400 Ω.
RxD, TxD, the mode pins NSTB, ENT and the failure flag pin NERR are con-
nected to the microcontroller.
The local wake pin should be connected to the switch via a 10-kΩ resistor to in-
crease the robustness against disturbance. A pull-up resistor is necessary; otherwise,
the node floats if the switch is open. The value on these resistors depends on the
required wetting current. The typical value is 1 kΩ, if the local wake pin is not used.
This pin can be connected to the supply pin VS.
The pin INH can be connected to a voltage regulator or DC/DC converter. The
transceiver controls now the power supply. In case of sleep mode, the power supply
is switched off via the INH pin and in case of an:
• Power up
• Local wake event on pin WK
• Remote bus wake
The power supply will be switched on again.
