ATA6602(2009) 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6602
(Rev.:2009)

Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

Figure 3-7. Wake Up Source Recognition

LIN Bus

VLIN < VS - 1V and

VLIN > 0.6 VS

TXD

High

Pre-normal Mode

Low

Normal Mode

RXD

VCC

High

Wake-up filtering time

tWAKE

Silent mode

Low

Pre-normal mode

EN

Node in Silent mode

Regulator Wake-up time

Normal mode

EN High

NRES If undervoltage, switch to Pre-normal Mode

Undervoltage detection active

3.3.16

Fail-safe Features

• During a short circuit at LIN, 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. During LIN

overtemperature switch-off, the VDD regulator works independently.

• The reverse current at pin LIN is very low (< 3 µA) during loss of VBAT or GND. This is optimal

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

• During a short circuit at VDD, the output limits the output current to IVDDn. Because of

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

switches into Pre-normal mode. If the chip temperature exceeds the value TVDDoff, the VDD

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

again. Because of Pre-normal mode, the VDD voltage will switch on again although EN is

switched off from the microcontroller. The microcontroller can start its normal operation.

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

disconnected.

• Pin RXD is connected with 5 kΩ to VCC, if VBatt is disconnected VCC is at GND level

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

disconnected.

14 ATA6602/ATA6603

4921E–AUTO–09/09

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