ata6621n ATMEL Corporation, ata6621n Datasheet - Page 10

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

Figure 3-5.
3.15.4
3.15.5
10
ATA6621N
Pre-normal Mode
Unpowered Mode
LIN Bus
LIN Wake-up Waveform Diagram from Sleep Mode
NRES
VCC
RXD
TXD
EN
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 ATA6621N 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
age threshold V
output voltage reaches its nominal value after t
the load.
The NRES is low for the reset time delay t
Battery
Bus wake-up filtering time
Low or floating
(V
Node in sleep mode
Low or floating
res
S
Off state
< 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
VLIN < 0.4 V
S_th
t
bus
, the IC mode changes from Unpowered mode to Pre-normal mode. The V
CC
(Figure 3-7 on page
= 5V ±2%/50 mA (see
S
Regulator wake-up time
Reset
time
reset
13). When V
Figure 3-7 on page
. During this time, no mode change is possible.
VCC
Pre-normal Mode
Microcontroller start-up
. This time depends on the V
On state
Low
time delay
S
becomes higher than the V
13). The NRES output switches
EN High
Normal Mode
CC
4887H–AUTO–12/07
capacitor and
S
undervolt-
CC