Rainbow-electronics ATA6630 Manual do Utilizador descarregar pdf (Página 13)

9117C–AUTO–10/09

ATA6628/ATA6630 [Preliminary]

4.4 Sleep or Silent Mode: Behavior at a Floating LIN-bus or a Short Circuited LIN to GND

In Sleep or in Silent Mode the device has a very low current consumption even during shortcir-

cuits or floating conditions on the bus. A floating bus can arise if the Master pull-up resistor is

missing, e.g., if it is switched off when the LIN- Master is in sleep mode or even if the power

supply of the Master node is switched off.

In order to minimize the current consumption I

in sleep or silent mode during voltage levels at

the LIN-pin below the LIN pre-wake threshold, the receiver is activated only for a specific time

tmon. If t

mon

elapses while the voltage at the bus is lower than Pre-wake detection low (V

LINL

)

and higher than the LIN dominant level, the receiver is switched off again and the circuit

changes back to sleep respectively Silent Mode. The current consumption is then the result of

VSsleep

or I

VSsilent

plus I

LINwake

. If a dominant state is reached on the bus no wake-up will occur.

Even if the voltage rises above the Pre-wake detection high (V

LINH

), the IC will stay in sleep

respectively silent mode (see Figure 4-6).

This means the LIN-bus must be above the Pre-wake detection threshold V

LINH

for a few micro-

seconds before a new LIN wake-up is possible.

Figure 4-6. Floating LIN-bus During Sleep or Silent Mode

If the ATA6628/ATA6630 is in Sleep or Silent Mode and the voltage level at the LIN-bus is in

dominant state (V

LIN

< V

BUSdom

) for a time period exceeding t

mon

(during a short circuit at LIN, for

example), the IC switches back to Sleep Mode respectively Silent Mode. The V

current

consumption then consists of I

VSsleep

or I

VSsilent

plus I

LINWAKE

. After a positive edge at pin LIN the

IC switches directly to Fail-safe Mode (see Figure 4-7 on page 14).

VSsleep/silent

VSsleep

VSfail

+ I

LINwake

VSsleep

BUSdom

LINL

mon

LIN Pre-wake

LIN dominant state

LIN BUS

Mode of

operation

Int. Pull-up

Resis tor

RLIN

Wake-up Detection Phase

off (disabled)

Sleep/Silent Mode Sleep/Silent Mode

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 33 34

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