AMIS-30600 American Microsystems, Inc., AMIS-30600 Datasheet - Page 4

• Manufacturer Part Number: AMIS-30600
• Description: Lin Transceiver
• Manufacturer: American Microsystems, Inc.

AMI Semiconductor
2.3 Application Information
1) after wake-up via bus
2) after start up
Fig.3: State Diagram
For fail safe reasons the MTC-30600 already has an internal pull
up resistor of 30kΩ implemented. To achieve the required
timings for the dominant to recessive transition of the bus
signal an additional external termination resistor of 1kΩ is
required. It is recommended to place this resistor in the master
node. To avoid reverse currents from the bus line into the
battery supply line in case of an unpowered node, it is
recommended to place a diode in series to the external pull up.
For small systems (low bus capacitance) the EMC performance
of the system is supported by an additional capacitor of at least
1nF in the master node (see figure 1, Typical application
diagram).
A capacitor of 10µF at the supply voltage input VB buffers the
input voltage. In combination with the required reverse polarity
diode this prevents the device from detecting power down
conditions in case of negative transients on the supply line.
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LIN transceiver
MTC-30600
4
In order to reduce the current consumption the MTC-30600
offers a sleep operation mode. This mode is selected by
switching the enable input EN low (see figure 3, state diagram).
In the sleep mode a voltage regulator can be controlled via the
INH output in order to minimize the current consumption of the
whole application. A wake-up caused by a message on the
communication bus automatically enables the voltage regulator
by switching the INH output high. In parallel, the wake-up is
indicated by setting the RxD output low. When entering the
normal mode this wake-up flag is reset and the RxD output is
released to transmit the bus data. In case the voltage regulator
control input is not connected to INH output or the
microcontroller is active respectively, the MTC-30600 can be
set in normal operation mode without a wake-up via the
communication bus.