AMIS-30600 Datasheet, PDF (4/11 Pages) AMI SEMICONDUCTOR – LIN Transceiver

AMIS−30600
APPLICATION INFORMATION
POWER
UP
INH = H
Rx = LIN data
NORMAL
MODE
EN = H
EN = H
VBB=anodn
VCC = on
INH = H
Rx = LIN data
STANDBY
MODE
EN= L
INH = H
Rx = H
NORMAL
MODE
POWER
UP
EN = H
VBB= on
STANDBY
MODE
EN= L
INH = H BVCC = on
Rx = H
EN = L
PC20061221.1
SLEEP
MODE
Wake−up over bus
t > t _wake
INH = Float
Rx = H
VCC= on
permanently
EN = L
SLEEP
MODE
Wake−up over bus
t > t _wake
IRNxH==FFloloaBat tVCC= off
VCCcontrolled by INH:
INH = Float B V _CC= off
INH = H B V _CC= on
Figure 3. State Diagrams
The AMIS−30600 has a slope which depends of the
supply V_bat. This implementation guarantees biggest
slope−time under all load conditions. The rising slope has to
be slower then the external RC−time−constant, otherwise
the slope will be terminated by the RC−time−constant and no
longer by the internal slope−control. This would affect the
symmetry of the bus−signal and would limit the maximum
allowed bus−speed.
A capacitor of 10 mF 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.
In order to reduce the current consumption, the
AMIS−30600 offers a sleep operation mode. This mode is
selected by switching the enable input EN low (see Figure
4).
An external voltage regulator can be controlled via the
INH output in order to minimize the current consumption of
the whole application in sleep mode (see Figure 2). A
wake−up caused by a message on the communication bus
automatically enables the voltage regulator by switching the
INH output high (see Figure 3). In case the voltage regulator
control input is not connected to the INH output, or the
microcontroller is active respectively, the AMIS−30600 can
be set in normal operation mode by EN = H (see Figure 3).
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