Rainbow-electronics ATA6625 Manual de usuario descargar pdf (Pagina 9)

4957E–AUTO–10/07

ATA6623/ATA6625

Figure 4-5. LIN Wake-up Diagram from Sleep Mode

4.4 Fail-safe Mode

At system power-up the device automatically switches to Fail-safe mode. The voltage regulator

is switched on (V

= 3.3V/5V/50 mA), (see Figure 6-1 on page 11). 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, and changes then to the Normal mode. A

power down of V

Batt

< 4V) during Silent- or Sleep mode switches the IC into the Fail-safe

mode after power up. A logic low at NRES switches the IC into Fail-safe mode directly.

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 6-1 on page 11). 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.

NRES is low for the reset time delay t

Reset

; no mode change is possible during this time.

Regulator wake-up time

Off state

On state

Low

Fail-safe Mode Normal Mode

EN High

Microcontroller

start-up time delay

Reset

time

Low or floating

NRES

VCC

voltage

regulator

RXD

LIN bus

Bus wake-up filtering time

bus

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 21 22

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Rainbow-electronics ATA6625 Manual de usuario Pagina 9

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