ATA6629 datasheet(13/26 Pages) ATMEL

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ATA6629/ATA6631 [DATASHEET]

9165F–AUTO–10/14

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.

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 15). 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

Table 4-3.

Signalling Fail-safe Sources

Fail-safe Sources

TXD

RXD

LIN wake up (pin LIN)

Low

VSth (battery) undervoltage detection

High

Low

VCC

LIN

NRES

Regulator drop voltage V

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

5.5

6.0

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

ATA6629 Datasheet(PDF) 13 Page - ATMEL Corporation

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