ata6603 ATMEL Corporation, ata6603 Datasheet - Page 12

• Manufacturer Part Number: ata6603
• Description: Microcontroller With Lin Transceiver, 5v Regulator And Watchdog
• Manufacturer: ATMEL Corporation

3.3.14.4
3.3.14.5
3.3.14.6
12
ATA6602/ATA6603
Pre-normal Mode
Unpowered Mode
Debug Mode
Figure 3-6.
At system power-up the device automatically switches to Pre-normal mode. The voltage regula-
tor is switched on V
to low for t
off and the watchdog is active. The LIN-SBC stays in this mode until EN is switched to high.
If V
Pre-normal mode. During this mode the TXD pin is an output.
If you connect battery voltage to the application circuit, the voltage at the VS pin increases due
to the block capacitor (see
voltage threshold V
V
and the load.
The NRES is low for the reset time delay t
The watchdog is switched off with pin MODE high (5V) and in normal operation if it is tied to
GND.
DD
Regulator
Battery
LIN bus
Voltage
output voltage reaches its nominal value after t
NRES
RXD
VCC
EN
(V
res
S
< 4V) is powered down during Silent mode or Sleep mode, the IC powers up into
= 10 ms and sends a reset to the microcontroller. LIN communication is switched
LIN Wake-up Waveform Diagram from Sleep Mode
DD
S_th
= 5V ±2%/50 mA (see
Bus wake-up filtering time
, the IC mode changes from Unpowered mode to Pre-normal mode. The
Low or floating
Low or floating
Figure 3-8 on page
Off state
t
bus
reset
Figure 3-8 on page
. During this time, no mode change is possible.
15). When V
VDD
Reset
time
Regulator Wake-up time
. This time depends on the V
Pre Normal Mode
S
becomes higher than the V
start-up time delay
Low
On state
Microcontroller
15). The NRES output switches
4921D–AUTO–08/07
operation
Node ln
EN High
Normal Mode
High
DD
capacitor
S
under-