ATA6621N-PGQW(2007) データシートの表示（PDF） - Atmel Corporation

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ATA6621N-PGQW
(Rev.:2007)

LIN Transceiver with 5V Regulator and Watchdog

Atmel Corporation 

Figure 3-5. LIN Wake-up Waveform Diagram from Sleep Mode

LIN Bus

TXD

VLIN < 0.4 VS

Pre-normal Mode

Normal Mode

RXD

VCC

EN

NRES

Low or floating

Bus wake-up filtering time

tbus

Off state

Regulator wake-up time

Node in sleep mode

Low or floating

Reset

time

Low

On state

EN High

Microcontroller start-up

time delay

3.15.4

3.15.5

Pre-normal Mode

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

tor is switched on VCC = 5V ±2%/50 mA (see Figure 3-7 on page 13). 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 ATA6621N 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 (Figure 3-7 on page 13). When VS becomes higher than the VS undervolt-

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

output voltage reaches its nominal value after tVCC. This time depends on the VCC capacitor and

the load.

The NRES is low for the reset time delay treset. During this time, no mode change is possible.

10 ATA6621N

4887H–AUTO–12/07

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