ATA6616 Ver la hoja de datos (PDF) - Atmel Corporation

Número de pieza

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Fabricante

ATA6616

Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

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 13).

Figure 3-5. Switch to Sleep Mode

Normal Mode

Sleep Mode

EN

TXD

NRES

VCC

Mode select window

td = 3.2µs

Delay time sleep mode

td_sleep = maximum 20µs

LIN

LIN switches directly to recessive mode

3.4.4

3.4.5

Fail-safe Mode

The device automatically switches to Fail-safe Mode at system power up and the voltage reg-

ulator is switched on (see Figure 3-7 on page 16).The NRES output switches to 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 < 4V) during Silent or Sleep Mode switches the IC into Fail-safe Mode. 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.

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 3-7 on page 16). 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.

The NRES is low for the reset time delay treset. During this time, treset, no mode change is

possible.

12 Atmel ATA6616/ATA6617

9132D–AUTO–12/10

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