ata6621n ATMEL Corporation, ata6621n Datasheet - Page 9

• Manufacturer Part Number: ata6621n
• Description: Lin Transceiver With 5v Regulator And Watchdog
• Manufacturer: ATMEL Corporation

3.15.3
4887H–AUTO–12/07
Sleep Mode
The falling edge at EN has to occur not more than t
ing edge at TXD in order to switch the IC into Sleep mode. The TXD Signal has to stay logic low
during the Mode Select window
In Sleep mode the transmission path is disabled. Supply current from V
I
termination between pin LIN and pin VS is disabled to minimize the power dissipation in case pin
LIN is shorted to GND. Only a weak pull-up current (typically 10 µA) between pin LIN and pin VS
is present.
A falling edge at pin LIN followed by a dominant bus level maintained for a certain time period
(t
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 pin RXD to interrupt the microcon-
troller.
With EN high you can switch directly from Silent mode to Normal mode. In the application where
the ATA6621N supplies the microcontroller, wake-up from Sleep mode is only possible via LIN
or pin WAKE.
If the device is switched into Sleep mode, V
reset at pin NRES.
Figure 3-4.
VSsleep
bus
) results in a remote wake-up request. The device switches from Sleep mode to Pre-normal
(Figure 3-5 on page
= 10 µA. The V
NRES
VCC
TXD
LIN
EN
Switch to Sleep Mode
CC
regulator is switched off. NRES and RXD are low. The internal slave
10)
(Figure
t
d
LIN switches directly to recessive mode
_sleep = maximum 15 µs
Delay time Sleep Mode
t
d
= 3.2 µs
Mode Select window
3-4). See also section
CC
ramps down without generating an undervoltage
DOMmin
= 6 ms after or 3.2 µs before the fall-
“Silent Mode” on page
Sleep Mode
ATA6621N
Bat
is typically
6.
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