ATA6631(2014) 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6631
(Rev.:2014)

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 IVSsleep_short or IVSsilent_short (typ. 10µA more

than IVSsleep respectively IVSsilent). 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 on page 11).

This means the LIN-bus must be above the pre-wake detection threshold VLINH for a few microseconds 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_short /

IVSsilent_short

IVSsleep/silent

Mode of

operation Sleep/Silent Mode

Wake-up Detection Phase

Sleep/Silent Mode

Int. Pull-up

Resistor

RLIN

off (disabled)

If the Atmel® 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 is IVSsleep_short or IVSsilent_short (typ. 10µA more than IVSsleep

respectively IVSsilent). After a positive edge at pin LIN the IC switches directly to fail-safe mode (see Figure 4-7 on page 12).

ATA6629/ATA6631 [DATASHEET]

11

9165F–AUTO–10/14

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