ATA6612 データシートの表示（PDF） - Atmel Corporation

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ATA6612

Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

ATA6612/ATA6613

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 3-6 on page 14).

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 3-5. Switch to Sleep Mode

Normal Mode

Sleep Mode

EN

TXD

NRES

Mode select window

td = 3.2 µs

VCC

Delay time sleep mode

td_sleep = maximum 20 µs

LIN

LIN switches directly to recessive mode

3.3.20.4

Fail-safe Mode

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

is switched on (VCC = 50 mA) (see Figure 3-7 on page 17). 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.

13

9111G–AUTO–05/10

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