Rainbow Electronics ATA6631 User Manual
Page 9
9
9165A–AUTO–11/09
ATA6629/ATA6631
A voltage less than the LIN Pre-wake detection V
LINL
at pin LIN activates the internal LIN
receiver and starts the wake-up detection timer.
A falling edge at the LIN pin followed by a dominant bus level maintained for a certain time
period (t
bus
) and a following rising edge at pin LIN results in a remote wake-up request. The
device switches from Sleep Mode to Fail-safe Mode.
The V
CC
regulator is activated, and the internal LIN slave termination resistor is switched on. The
remote wake-up request is indicated by a low level at RXD and TXD to interrupt the microcon-
troller (
EN high can be used to switch directly from Sleep/Silent to Fail-safe Mode. If EN is still high after
VCC ramp up and undervoltage reset time, the IC switches to Normal Mode.
Figure 4-5.
LIN Wake-up Diagram from Sleep Mode
Reg
u
l
a
tor w
a
ke-
u
p time
Off
s
t
a
te
On
s
t
a
te
Low
Fail-
s
afe Mode
Normal Mode
EN High
Microcontroller
s
t
a
rt-
u
p time del
a
y
Re
s
et
time
Low or flo
a
ting
Low or flo
a
ting
NRE
S
EN
VCC
volt
a
ge
reg
u
l
a
tor
RXD
LIN
bus
B
us
w
a
ke-
u
p filtering time
t
bus
High
TXD