Rainbow-electronics ATA6624 Manual de usuario descargar pdf (Pagina 10)

4986F–AUTO–07/08

ATA6622/ATA6624/ATA6626

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

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 t

res

= 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 V

Batt

< 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 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.

Delay time sleep mode

d_sleep

= maximum 20 µs

LIN switches directly to recessive mode

= 3.2 µs

LIN

VCC

NRES

TXD

Sleep ModeNormal Mode

Mode select window

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 28 29

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