ATA6625 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6625

LIN Bus Transceiver with Integrated Volt age Regulator

Atmel Corporation 

ATA6623/ATA6625

Figure 4-5.

LIN Wake-up Diagram from Sleep Mode

Bus wake-up filtering time

tbus

Fail-safe Mode

LIN bus

Normal Mode

RXD

Low or floating

Low

VCC

voltage

regulator

EN

NRES

Off state

Low or floating

On state

Regulator wake-up time

EN High

Reset

time

Microcontroller

start-up time delay

4.4 Fail-safe Mode

At system power-up the device automatically switches to Fail-safe Mode. The voltage regulator

is switched on (VCC = 3.3V/5V/50 mA), (see Figure 6-1 on page 11). The NRES output switches

to low for tres = 4 ms and gives a reset to the microcontroller. LIN communication is switched off.

The IC stays in this mode until EN is switched to high, and changes then to the Normal Mode. A

power down of VBatt (VS < 4V) during Silent- or Sleep Mode switches the IC into the Fail-safe

Mode after power up. A logic low at NRES switches the IC into Fail-safe Mode directly.

4.5 Unpowered Mode

If you connect battery voltage to the application circuit, the voltage at the VS pin increases

according to the block capacitor (see Figure 6-1 on page 11). After VS is higher than the VS

undervoltage threshold VSth, the IC mode changes from Unpowered Mode to Fail-safe Mode.

The VCC output voltage reaches its nominal value after tVCC. This time, tVCC, depends on the

VCC capacitor and the load.

NRES is low for the reset time delay tReset; no mode change is possible during this time.

9

4957H–AUTO–05/10

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