ATA6622(2008) データシートの表示（PDF） - Atmel Corporation

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ATA6622
(Rev.:2008)

LIN Bus Transceiver with 3.3V (5V) Regulator and Watchdog

Atmel Corporation 

The VCC regulator is activated, and the internal LIN slave termination resistor is switched on.

The remote wake-up request is indicated by a low level at the RXD pin to interrupt the microcon-

troller (see Figure 4-5 on page 11).

EN high can be used to switch directly from Sleep/Silent to Fail-safe Mode. If EN is still high after

VCC ramp up and undervoltage reset time, the IC switches to the Normal Mode.

Figure 4-4. Switch to Sleep Mode

Normal Mode

Sleep Mode

EN

TXD

NRES

Mode select window

td = 3.2 µs

VCC

Delay time sleep mode

td_sleep = maximum 20 µs

LIN

LIN switches directly to recessive mode

4.4 Fail-safe Mode

The device automatically switches to Fail-safe Mode at system power-up. The voltage regulator

is switched on (VCC = 3.3V/5V/2%/50 mA) (see Figure 5-1 on page 14). The NRES output

switches to low for tres = 4 ms and gives a reset to the microcontroller. LIN communication is

switched off. The IC stays in this mode until EN is switched to high. The IC then changes to Nor-

mal Mode. A power down of VBatt (VS < 4V) during Silent or Sleep Mode switches the IC into

Fail-safe Mode after power up. A low at NRES switches into Fail-safe Mode directly. During

Fail-safe Mode the TXD pin is an output and signals the last wake-up source.

4.5 Unpowered Mode

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

according to the block capacitor (see Figure 5-1 on page 14). After VS is higher than the VS

undervoltage threshold VSth, the IC mode changes from Unpowered Mode to Fail-safe Mode.

The VCC output voltage reaches its nominal value after tVCC. This time, tVCC, depends on the

VCC capacitor and the load.

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

possible.

10 ATA6622/ATA6624/ATA6626

4986F–AUTO–07/08

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