ATA6631 Ver la hoja de datos (PDF) - Atmel Corporation

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ATA6631

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

A wake-up event from either Silent or Sleep Mode will be signalled to the microcontroller using

the two pins RXD and TXD. The coding is shown in Table 4-3.

A wake-up event will lead the IC to the Fail-safe Mode.

Table 4-3. Signalling Fail-safe Sources

Fail-safe Sources

LIN wake up (pin LIN)

VSth (battery) undervoltage detection

TXD

Low

High

RXD

Low

Low

4.6 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 6-1 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.

IF VS drops below VSth, then the IC switches to Unpowered Mode. The behaviour of VCC,

NRES and LIN is shown in Figure 4-8.

Figure 4-8.

VCC versus VS for the VCC = 3.3V Regulator

6 .0

5.5

5.0

4 .5

Regulator drop voltage VD

4 .0

LIN

3 .5

3 .0

2 .5

VS

2 .0

NRES

1.5

1.0

VCC

0 .5

0 .0

0 .0 0 .5 1.0 1.5 2 .0 2 .5 3 .0 3 .5 4 .0 4 .5 5.0 5.5 6 .0

VS in V

12 ATA6629/ATA6631

9165B–AUTO–05/10

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