ata6625-taqy ATMEL Corporation, ata6625-taqy Datasheet - Page 8

• Manufacturer Part Number: ata6625-taqy
• Description: Lin Bus Transceiver With Integrated Vol Tage Regulator
• Manufacturer: ATMEL Corporation

4.3
8
Sleep Mode
ATA6623/ATA6625
A falling edge at EN while TXD is low switches the IC into Sleep Mode. The TXD Signal has to
be 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 short-circuited to GND. Only a weak pull-up current (typically 10 µA) between pin LIN and
pin VS is present. The Sleep Mode can be activated independently from the current level on pin
LIN.
A voltage less than the LIN Pre-wake detection V
receiver.
A falling edge at the LIN pin followed by a dominant bus level maintained for a certain time
period (t
request. The device switches from Sleep Mode to Fail-safe Mode.
The V
remote wake-up request is indicated by a low level at the RXD pin to interrupt the microcontroller
(Figure 4-5 on page
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 Normal Mode.
Figure 4-4.
VSsleep
CC
= 10 µA. The V
bus
regulator is activated, and the internal LIN slave termination resistor is switched on. The
NRES
VCC
TXD
) and a following rising edge at pin LIN respectively results in a remote wake-up
LIN
EN
Switch to Sleep Mode
Normal Mode
9).
CC
regulator is switched off; NRES and RXD are low. The internal slave
LIN switches directly to recessive mode
t
d_sleep
Delay time sleep mode
t
d
= 3.2 µs
Mode select window
= maximum 20 µs
(Figure 4-4 on page
LINL
at pin LIN activates the internal LIN
8).
Sleep Mode
Batt
4957F–AUTO–02/08
is typically