ATA6602(2009) データシートの表示（PDF） - Atmel Corporation

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ATA6602
(Rev.:2009)

Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

Figure 3-6. LIN Wake-up Waveform Diagram from Sleep Mode

Pre Normal Mode

LIN bus

Normal Mode

RXD

VCC

Voltage

Regulator

EN

NRES

Low or floating

Bus wake-up filtering time

tbus

Off state

Low or floating

Low

High

On state

Regulator Wake-up time

Node ln

operation

EN High

Reset

time

Microcontroller

start-up time delay

3.3.14.4

3.3.14.5

3.3.14.6

Pre-normal Mode

At system power-up the device automatically switches to Pre-normal mode. The voltage regula-

tor is switched on VDD = 5V ±2%/50 mA (see Figure 3-8 on page 15). The NRES output switches

to low for tres = 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 VBattery (VS < 4V) is powered down during Silent mode or Sleep mode, the IC powers up into

Pre-normal mode. During this mode the TXD pin is an output.

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 3-8 on page 15). When VS becomes higher than the VS under-

voltage threshold VS_th, the IC mode changes from Unpowered mode to Pre-normal mode. The

VDD 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 treset. During this time, no mode change is possible.

Debug Mode

The watchdog is switched off with pin MODE high (5V) and in normal operation if it is tied to

GND.

12 ATA6602/ATA6603

4921E–AUTO–09/09

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