ATA6621 Ver la hoja de datos (PDF) - Atmel Corporation

Número de pieza

componentes Descripción

Fabricante

ATA6621

LIN Transceiver with 5V Regulator and Watchdog

Atmel Corporation 

Figure 3-4. Switch to Sleep Mode

EN

TXD

NRES

Mode Select window

Td = 3.2 µs

ATA6621

Sleep Mode

VCC

Delay time Sleep Mode

Td_sleep = maximum 15 µs

LIN

LIN switches directly to recessive mode

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 VCC = 5V ±2%/50 mA (see Figure 3-6 on page 12). 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 ATA6621 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.

3.13.5

3.13.6

Unpowered Mode

If you connect battery voltage to the application circuit, the voltage at the VS pin increases due

to the block capacitor (Figure 3-6 on page 12). 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.

Debug Mode

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

GND (see Figure 5-2 on page 23).

9

4887D–AUTO–12/06

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