ATA663201 datasheet(7/36 Pages) MICROCHIP

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DS20006075D-page 7

ATA663201/03/31/54

1.3

Wake-Up Scenarios from Silent

Mode or Sleep Mode

1.3.1

REMOTE WAKE-UP VIA LIN BUS

1.3.1.1

Remote Wake-Up from Silent Mode

(SBC only)

A remote wake-up from Silent mode is only possible if

TXD is high. A voltage less than the LIN pre-wake

detection VLINL at the LIN pin activates the internal LIN

receiver and starts the wake-up detection timer. A

falling edge at the LIN pin followed by a dominant bus

level maintained for a certain period of time (>tbus) and

the following rising edge at pin LIN (see Figure 1-5)

result in a remote wake-up request. The device

switches from Silent mode to Fail-Safe mode, the VCC

voltage regulator remains activated and the internal

LIN termination resistor is switched on. The remote

wake-up request is indicated by a low level at the RXD

pin and TXD pin (strong pull-down at TXD). EN high

can be used to switch directly to Normal mode.

FIGURE 1-5:

LIN WAKE-UP FROM SILENT MODE

1.3.1.2

Remote Wake-Up from Sleep Mode

(SBC only)

A falling edge at the LIN pin followed by a dominant bus

level maintained for a certain period of time (>tbus) and

a following rising edge at the LIN pin result in a remote

wake-up request, causing the device to switch from

Sleep mode to Fail-Safe mode.

The VCC regulator is activated, and the internal LIN

termination resistor is switched on. The remote wake-

up request is indicated by a low level at RXD and TXD

(strong pull-down at TXD) (see Figure 1-6).

EN high can be used to switch directly from Sleep/

Silent mode to Fail-Safe mode. If EN is still high after

VCC ramp-up and undervoltage reset time, the IC

switches to Normal mode.

TABLE 1-2:

SIGNALING IN FAIL-SAFE MODE

Fail-Safe Sources

TXD

RXD

LIN wake-up (LIN pin)

Low

VSth (battery) undervoltage detection (VVS <3.9V)

High

Low

Undervoltage detection active

Silent mode 3.3V/5V

Fail- afe mode 3.3V/5V

Normal mode

Low

Fail- afe Mode

Normal Mode

EN High

High

NRES

VCC

RXD

LIN bus

Bus wake-up filtering time

tbus

High

TXD

High

Low (strong pull-down)

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