ATA6625 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6625

LIN Bus Transceiver with Integrated Volt age Regulator

Atmel Corporation 

5. Fail-safe Features

• During a short-circuit at LIN to VBattery, the output limits the output current to IBUS_lim. Due to

the power dissipation, the chip temperature exceeds TLINoff and the LIN output is switched off.

The chip cools down and after a hysteresis of Thys, switches the output on again. RXD stays

on high because LIN is high. During LIN overtemperature switch-off, the VCC regulator is

working independently.

• During a short-circuit from LIN to GND the IC can be switched into Sleep or Silent Mode. If

the short-circuit disappears, the IC starts with a remote wake-up.

• The reverse current is very low < 2 µA at pin LIN during loss of VBatt. This is optimal behavior

for bus systems where some slave nodes are supplied from battery or ignition.

• During a short circuit at VCC, the output limits the output current to IVCClim. Because of

undervoltage, NRES switches to low and sends a reset to the microcontroller. The IC

switches into Fail-safe Mode. If the chip temperature exceeds the value TVCCoff, the VCC

output switches off. The chip cools down and after a hysteresis of Thys, switches the output on

again. Because of Fail-safe Mode, the VCC voltage will switch on again although EN is

switched off from the microcontroller. The microcontroller can then start with normal

operation.

• Pin EN provides a pull-down resistor to force the transceiver into Recessive Mode if EN is

disconnected.

• Pin RXD is set floating if VBatt is disconnected.

• Pin TXD provides a pull-up resistor to force the transceiver into Recessive Mode if TXD is

disconnected.

• If TXD is short-circuited to GND, it is possible to switch to Sleep Mode via ENABLE after

tdom > 20 ms.

10 ATA6623/ATA6625

4957H–AUTO–05/10

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