Manual

7
9146E–AUTO–03/11
Atmel ATA6663/ATA6664
Figure 3-3. Floating LIN Bus During Sleep Mode
If the Atmel
®
ATA6663/ATA6664 is in sleep mode and the voltage level at the LIN is in domi-
nant state (V
LIN
< V
BUSdom
) for a time period exceeding t
mon
(during a short circuit at LIN, for
example), the IC switches back to sleep mode. The VS current consumption then consists of
I
VSsleep
plus I
LINWAKE
. After a positive edge at pin LIN the IC switches directly to fail-safe mode
(see Figure 3-4).
Figure 3-4. Short Circuit to GND on the LIN Bus During Sleep Mode
I
VSsleep
I
VSsleep
I
VSfail
+ I
LINwake
I
VSsleep
V
BUSdom
V
LINL
I
VS
t
mon
LIN Pre-wake
LIN dominant state
LIN BUS
Mode of
operation
Int. Pull-up
Resistor
RLIN
Wake-up Detection Phase
off (disabled)
Sleep Mode Sleep Mode
Sleep Mode
I
VSsleep
I
VSfail
+ I
LINwake
I
VSsleep
V
BUSdom
V
LINL
LIN Pre-wake
LIN dominant state
LIN BUS
I
VS
Mode of
operation
Int. Pull-up
Resistor
RLIN
off (disabled) on (enabled)
Wake-up Detection PhaseSleep Mode Fail-Safe Mode
t
mon
t
mon