Rainbow Electronics ATA6630 - Manual (Page 12)

12
9117C–AUTO–10/09
ATA6628/ATA6630 [Preliminary]
A falling edge at the LIN pin followed by a dominant bus level maintained for a certain time
period (t
bus
) and a rising edge at pin LIN result in a remote wake-up request. The device
switches from Sleep Mode to Fail-safe Mode.
The VCC 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 the RXD pin to interrupt the microcon-
troller (see
Figure 4-5 on page 12 ).
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 the Normal Mode.
Figure 4-5. LIN Wake Up 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
Re s et
time
Low or flo a ting
Flo a ting
W a tchdog
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
TXD
W a tchdog off S t a rt w a tchdog le a d time t
d
s t a rt- u p time del a y