Rainbow-electronics ATA6823 Manual de usuario descargar pdf (Pagina 7)

4856E–AUTO–07/07

ATA6823 [Preliminary]

Pulling the EN2 pin up to the V

BAT

level will drive the IC into Active mode. EN2 is debounced with

a time constant of 20 µs, based on a 100 kHz clock.

• Go to Active using the LIN interface

The second possibility for wake-up can be performed using the LIN transceiver. In Sleep mode,

the LIN receiver is partially active.

The wake-up by LIN requires 2 steps:

1. If the voltage on pin LIN is below a value of V

/DATwake

(about V

VBAT

– 2V) the receive part

of the LIN interface is active (not to be confused with Active mode of the whole IC). The

active receive part is able to detect a valid LOW on the LIN pin.

2. If LIN = LOW during a filter time t

wakeLIN

(typically 70 µs) the IC will change to Active

mode. A short change back to HIGH during the filter time will reset the filter. This infor-

mation is stored in a latch after entering Active mode

If the change to Active mode was caused by LIN, the EN1 or EN2 pins may remain LOW without

disturbing the Active mode.

• Stay in Active via EN1

The input EN1 is intended to keep the IC in Active Mode via a signal from the microcontroller.

The input is ESD-protected by diodes against GND and VCC. Therefore, the input voltage must

be positive and not higher than V

. EN1 cannot be used to switch from Sleep to Active because

the VCC regulator is off in the Sleep mode and V

will be zero.

• Go to Sleep

A HIGH to LOW transition at pin EN1 and a following permanent LOW for the time t

gotosleep

(typically 20 µs) switches the IC to Sleep mode.

Figure 5-1 illustrates the wake-up by LIN. The status PREWAKE is characterized by the acti-

vated receive block of the LIN interface. After going to Active mode, the V

regulator starts

working.

Go to Sleep is possible with a valid HIGH to LOW transition at pin EN1 (permanent LOW for

longer than t

) if EN1 was in a valid HIGH state (HIGH for longer than t

) before.

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