ATA6620N データシートの表示（PDF） - Atmel Corporation

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ATA6620N

LIN Bus Transceiver with Integrated Voltage Regulator

Atmel Corporation 

Figure 4-6. Wake Up from Silent Mode at an Insufficient Falling Edge at Pin LIN

Pre-normal Mode

LIN Bus

VLIN < VS - 1V and

VLIN > 0.6 VS

TXD

High

Low

Normal Mode

RXD

VCC

EN

High

Low

Wake-up filtering

time t WAKE

Silent mode

Pre-normal mode

Node ln silent mode

Regulator Wake-up Time

Normal mode

EN High

NRES

If undervoltage switch to pre-normal mode

Undervoltage detection active

When designing the complete system it has to be considered, that in this case (only in pre-nor-

mal mode) the pin TXD of the ATA6620N works as an output.

4.3 Pre-normal Mode

At system power-up the device automatically switches to Pre-normal mode. The voltage regula-

tor is switched on (VCC = 5V/50 mA) (see Figure 4-7 on page 11) after typically tVCC > 300 µs.

The NRES output switches to low for tres = 10 ms and sends a reset to the microcontroller. LIN

communication is switched off, and the undervoltage detection is active.

A power-down of VBatt (VS < 4.15V) during Silent or Sleep mode switches into Pre-normal mode

after powering up the IC. During this mode the TXD pin is an output.

10 ATA6620N

4850I–AUTO–09/09

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