ata6616 ATMEL Corporation, ata6616 Datasheet - Page 12

• Manufacturer Part Number: ata6616
• Description: Microcontroller With Lin Transceiver, 5v Regulator And Watchdog
• Manufacturer: ATMEL Corporation

3.4.4
3.4.5
12
ATA6616/ATA6617 [Preliminary]
Fail-safe Mode
Unpowered Mode
The device switches from Sleep Mode to Fail-safe Mode and the VCC regulator is activated and
the internal LIN slave termination resistor is switched off. The remote wake-up request is indi-
cated by a low level at the RXD pin to interrupt the microcontroller (see
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 3-5.
The device automatically switches to Fail-safe Mode at system power-up. The voltage regulator
is switched on (VCC = 50 mA) (see
t
stays in this mode until EN is switched to high. The IC then changes to Normal Mode. A power
down of V
power up. A low at NRES switches into Fail-safe Mode directly. During Fail-safe Mode the TXD
pin is an output and signals the last wake-up source.
If you connect battery voltage to the application circuit, the voltage at the VS pin increases
according to the block capacitor (see
undervoltage threshold VS
The VCC output voltage reaches its nominal value after t
VCC capacitor and the load.
The NRES is low for the reset time delay t
possible.
res
= 4 ms and gives a reset to the microcontroller. LIN communication is switched off. The IC
NRES
Batt
VCC
TXD
LIN
EN
(V
Switch to Sleep Mode
S
< 4V) during Silent or Sleep Mode switches the IC into Fail-safe Mode after
Normal Mode
th
, the IC mode changes from Unpowered Mode to Fail-safe Mode.
LIN switches directly to recessive mode
t
d_sleep
Delay time sleep mode
Figure 3-7 on page
t
d
= 3.2 µs
Figure 3-7 on page
= maximum 20 µs
Mode select window
reset
DRAFT
. During this time, t
16).The NRES output switches to low for
VCC
16). After VS is higher than the VS
. This time, t
Sleep Mode
reset
Figure 3-6 on page
, no mode change is
VCC
, depends on the
9132A–AUTO–10/08
13).