ATA6630 データシートの表示（PDF） - Atmel Corporation

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ATA6630

LIN Bus Transceiver with 3.3V (5V) Regulator and Watchdog

Atmel Corporation 

4.5 Fail-safe Mode

The device automatically switches to Fail-safe Mode at system power-up. The voltage regulator is switched on (see Figure

5-1 on page 18). The NRES output remains low for tres = 4ms and gives a reset to the microcontroller. LIN communication is

switched off. The IC stays in this mode until EN is switched to high. The IC then changes to Normal Mode. A power down of

VBatt (VS < VSthU) during Silent or Sleep Mode switches the IC into Fail-safe Mode after power up. A low at NRES switches

into Fail-safe Mode directly. During Fail-safe Mode, the TXD pin is an output and signals the fail-safe source. The watchdog

is switched on.

The LIN SBC can operate in different Modes, like Normal, Silent, or Sleep Mode. The functionality of these modes is

described in Table 4-2.

Table 4-2. TXD, RXD Depending from Operation Modes

Different Modes

Fail-safe Mode

Normal Mode

Silent Mode

Sleep Mode

TXD

RXD

Signalling fail-safe sources (see Table 4-3 and Table 4-4)

Follows data transmission

High

High

Low

Low

A wake-up event from either Silent or Sleep Mode will be signalled to the microcontroller using the two pins RXD and TXD.

The coding is shown in Table 4-3.

A wake-up event will switch the IC to the Fail-safe Mode.

Table 4-3. Signalling Fail-safe Sources

Fail-safe Sources

LIN wake-up (pin LIN)

Local wake-up (at pin Wake, pin KL15)

VSth (battery) undervoltage detection

TXD

Low

Low

High

RXD

Low

High

Low

Table 4-4. Signalling in Fail-safe Mode after Reset (NRES was Low), Shows the Reset Source at TXD and RXD

Pins

Fail-safe Sources

VCC undervoltage at NRES

Watchdog reset at NRES

TXD

High

High

RXD

Low

High

14 ATA6628/ATA6630 [DATASHEET]

9117I–AUTO–10/14

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