ata6663 ATMEL Corporation, ata6663 Datasheet - Page 6

• Manufacturer Part Number: ata6663
• Description: Lin Transceiver
• Manufacturer: ATMEL Corporation

3.12
6
Remote Wake-up via Dominant Bus State
Atmel ATA6663/ATA6664
A voltage lower than the LIN pre-wake detection V
receiver and starts the wake-up detection timer.
A falling edge at pin LIN, followed by a dominant bus level V
time period (t
switches to fail-safe mode. Pin INH is activated (switches to V
resistor is switched on. The remote wake-up request is indicated by a low level at pin RXD to
interrupt the microcontroller (see
Figure 3-2.
In sleep mode the device has a very low current consumption, even during short-circuits or
floating conditions on the bus. A floating bus can arise if the Master pull-up resistor is missing,
e.g., in case it is switched off when the LIN Master is in sleep mode or if the power supply of
the Master node is switched off.
To minimize the current consumption I
pre-wake threshold, the receiver is activated only for a specific time t
the voltage at the bus is lower than pre-wake detection low (V
dominant level, the receiver is switched off again and the circuit reverts to sleep mode. The
current consumption is then the result of I
the bus no wake-up will occur. Even if the voltage exceeds the pre-wake detection high
(V
This means the LIN bus must be above the Pre-wake detection threshold V
microseconds before a new LIN wake-up is possible.
regulator
External
LIN bus
voltage
LINH
RXD
INH
EN
), the IC will remain in sleep mode (see
BUS
LIN Wake-up Waveform Diagram
) and a rising edge at pin LIN results in a remote wake-up request. The device
Bus wake-up filtering time
Node in sleep state
High or floating
Low or floating
Off state
(t
BUS
)
Figure
VS
3-2).
VSsleep
during voltage levels at the LIN-pin below the LIN
Figure 3-3 on page
plus I
LINL
LINwake
Regulator wake-up time delay
at pin LIN activates the internal LIN
Microcontroller start-up
. If a dominant state is reached on
BUSdom
S
High
delay time
Low
) and the internal termination
LINL
7).
) and higher than the LIN
mon
maintained for a certain
. If t
mon
9146D–AUTO–09/10
LINH
elapses while
EN High
Normal
Mode
for a few