Rainbow-electronics ATA6630 Manual do Utilizador descarregar pdf (Página 16)

9117C–AUTO–10/09

ATA6628/ATA6630 [Preliminary]

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 5-1 on page 19). After VS is higher than the VS

undervoltage threshold VS

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

The VCC output voltage reaches its nominal value after t

VCC

. This time, t

VCC

, depends on the

VCC capacitor and the load.

The NRES is low for the reset time delay t

reset

. During this time, t

reset

, no mode change is

possible.

IF VS drops below VS

, then the IC switches to Unpowered Mode. The behavior of VCC, NRES

and LIN is shown in Figure 4-8. The watchdog needs to be triggered.

Figure 4-8. VCC versus VS for the VCC = 3.3V Regulator

4.7 High-speed Mode

If SP_MODE pin is high and the IC is in Normal Mode, the slew rate control is switched off. The

slope time of the LIN falling edge is t

S_Fall

< 2 µs. The slope time of the LIN rising edge strongly

depends on the LIN capacitive and resistive load. To achieve a high baud rate it is recom-

mended to use a small resistor (500Ω) and a low capacitor. This allows very fast data

transmission up to 115 kBaud, e.g., for electronic control (ECU) tests and microcontroller pro-

gram or data download. In this mode superior EMC performance is not guaranteed.

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

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

V in V

VCC

LIN

NRES

Regulator drop voltage V

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 33 34

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