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ATA6602 Datasheet(PDF) 11 Page - ATMEL Corporation

Part # ATA6602
Description  Microcontroller with LIN Transceiver, 5V Regulator and Watchdog
Download  362 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATA6602 Datasheet(HTML) 11 Page - ATMEL Corporation

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11
4921C–AUTO–01/07
ATA6602/ATA6603
Figure 3-5.
Switch to Sleep Mode
3.3.13.4
Pre Normal Mode
At system power-up the device automatically switches to Pre Normal Mode. The voltage regula-
tor is switched on V
DD = 5V ±2%/50 mA (see Figure 3-7 on page 14). The NRES output switches
to low for t
res = 10 ms and sends a reset to the microcontroller. LIN communication is switched
off and the watchdog is active. The LIN-SBC stays in this mode until EN is switched to high.
If V
Battery (VS < 4V) is powered down during Silent Mode or Sleep Mode, the IC powers up into
Pre Normal Mode.
3.3.13.5
Unpowered Mode
If you connect battery voltage to the application circuit, the voltage at the VS pin increases due
to the block capacitor (see Figure 3-7 on page 14). When V
S becomes higher than the VS under-
voltage threshold V
S_th, the IC mode changes from Unpowered Mode to Pre Normal Mode. The
V
DD output voltage reaches its nominal value after tVDD. This time depends on the VDD capacitor
and the load.
The NRES is low for the reset time delay t
reset. During this time, no mode change is possible.
3.3.13.6
Debug Mode
The watchdog is switched off with pin MODE high (5V) and in normal operation if it is tied to
GND.
Delay time Sleep Mode
Td_sleep = maximum 15 µs
Mode Select window
LIN switches directly to recessive mode
Td = 3.2 µs
LIN
VCC
NRES
TXD
EN
Sleep Mode


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