Rainbow Electronics ATA6631 - Manual (Page 7)

7
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 the following rising edge at pin LIN (see Figure 4-3 on page 7 ) results in a
remote wake-up request. The device switches from Silent Mode to Fail-safe Mode, then the
internal LIN slave termination resistor is switched on. The remote wake-up request is indicated
by a low level at pin RXD and TXD to interrupt the microcontroller (
Figure 4-3 on page 7 ). EN
high can be used to switch directly to Normal Mode.
Figure 4-3. LIN Wake-up Waveform Diagram from Silent Mode
Undervolt a ge detection a ctive
S ilent mode 3 . 3 V/5V/50 mA F a il- sa fe mode 3 . 3 V/5V/50 mA Norm a l mode
Low
F a il- sa fe mode Norm a l mode
EN High
High
NRE S
EN
VCC
RXD
LIN bus
B us w a ke- u p filtering time
t
bus
High TXD High