Rainbow Electronics ATA6626 - Manual (Page 9)

9
4986B–AUTO–07/07
ATA6622/ATA6624/ATA6626 [Preliminary]
DRAFT
Figure 4-3. LIN Wake Up from Silent Mode
4.3 Sleep Mode
A falling edge at EN when TXD is low switches the IC into Sleep Mode. The TXD Signal has to
be logic low during the Mode Select window (
Figure 4-4 on page 10 ). The transmission path is
disabled in Sleep Mode. The supply current I
VSsleep
from V
Batt
is typically 10 µA.
The VCC regulator is switched off. NRES and RXD are low. The internal slave termination
between the LIN pin and VS pin is disabled to minimize the power dissipation in the event that
the LIN pin is short-circuited to GND. Only a weak pull-up current (typically 10 µA) between the
LIN pin and the VS pin is present. Sleep Mode can be activated independently from the current
level on the LIN, WAKE, or KL_15 pin.
A voltage less than the LIN Pre_Wake detection VLINL at the LIN pin activates the internal LIN
receiver.
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 respectively result in a remote wake-up request. The
device switches from Sleep Mode to Fail-safe Mode.
Watchdog off Start watchdog lead time t
d
Watchdog
Undervoltage detection active
Silent mode 3.3V/5V/50 mA Fail safe mode 3.3V/5V/50 mA Normal mode
Low
Fail-safe mode Normal mode
EN High
Node in silent mode
High High
NRES
EN
VCC
voltage
regulator
RXD
LIN bus
Bus wake-up filtering time
t
bus
TXD