ATA6629 查看數據表（PDF） - Atmel Corporation

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ATA6629

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

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

short-circuits 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 IVS 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 tmon elapses while the voltage at the bus is lower than Pre-wake detection low (VLINL)

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

IVSsleep or IVSsilent plus ILINwake. 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 (VLINH), 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 VLINH for a few micro-

seconds before a new LIN wake-up is possible.

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

LIN BUS

VLINL

VBUSdom

LIN Pre-wake

LIN dominant state

IVS

IVSsleep/silent

tmon

IVSfail

IVSsleep

+ ILINwake

IVSsleep

Mode of

operation Sleep/Silent Mode

Wake-up Detection Phase

Sleep/Silent Mode

Int. Pull-up

Resistor

RLIN

off (disabled)

If the ATA6629/ATA6631 is in Sleep or Silent Mode and the voltage level at the LIN-bus is in

dominant state (VLIN < VBUSdom) for a time period exceeding tmon (during a short circuit at LIN, for

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

consumption then consists of IVSsleep or IVSsilent plus ILINWAKE. After a positive edge at pin LIN the

IC switches directly to Fail-safe Mode (see Figure 4-7 on page 11).

10 ATA6629/ATA6631

9165B–AUTO–05/10

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