ATA6622 데이터 시트보기 (PDF) - Atmel Corporation

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ATA6622

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

Atmel Corporation 

The VCC regulator is switched off. NRES and RXD are low. The internal slave termination

between the LIN pin and VS pin is disabled, only a weak pull-up current (typically 10 µA)

between the LIN pin and the VS pin is present. Sleep Mode can be activated independently from

the current level on the LIN, WAKE, or KL_15 pin.

A voltage less than the LIN Pre_Wake detection VLINL at the LIN pin activates the internal LIN

receiver and switches on the internal slave termination between the LIN pin and the VS pin.

A falling edge at the LIN pin followed by a dominant bus level maintained for a certain time

period (tbus) and a following rising edge at pin LIN results in a remote wake-up request. The

device switches from Sleep Mode to Fail-safe Mode.

The VCC regulator is activated, and the remote wake-up request is indicated by a low level at

the RXD pin to interrupt the microcontroller (see Figure 4-5 on page 11).

EN high can be used to switch directly from Sleep/Silent to Fail-safe Mode. If EN is still high after

VCC ramp up and undervoltage reset time, the IC switches to the Normal Mode.

Figure 4-4. Switch to Sleep Mode

Normal Mode

Sleep Mode

EN

TXD

NRES

VCC

Mode select window

td = 3.2 µs

Delay time sleep mode

td_sleep = maximum 20 µs

LIN

LIN switches directly to recessive mode

4.4 Fail-safe Mode

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

is switched on (VCC = 3.3V/5V/2%/50 mA) (see Figure 5-1 on page 14). 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. The IC then changes to

Normal Mode. A power down of VBatt (VS < 4V) 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 last wake-up source.

10 ATA6622/ATA6624/ATA6626

4986I–AUTO–07/10

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