ATA663201 datasheet(8/36 Pages) MICROCHIP

8 / 36 page

ATA663201/03/31/54

DS20006075D-page 8

 2018-2021 Microchip Technology Inc.

FIGURE 1-6:

LIN WAKE-UP FROM SLEEP MODE

1.3.2

WAKE-UP SOURCE RECOGNITION

(SBC ONLY)

The device can distinguish between different wake-up

sources. The wake-up source can be read on the TXD

and RXD pin in Fail-Safe mode. These flags are

immediately reset if the microcontroller sets the EN pin

to high and the IC is in Normal mode.

1.4

Behavior Under Low Supply

Voltage Condition

After the battery voltage has been connected to the

application circuit, the voltage at the VS pin increases

according to the block capacitor used in the application

(see Figure 1-14). If VVS is higher than the minimum

VS operation threshold VVS_th_U_F_up, the IC mode

changes from unpowered mode to Fail-Safe mode. As

soon as VVS exceeds the undervoltage threshold

VVS_th_F_N_up, the LIN transceiver can be activated.

The VCC output voltage reaches its nominal value after

tVCC. This parameter depends on the externally applied

VCC capacitor and the load. The NRES output is low

for the reset time delay treset. No mode change is

possible during this time treset.

The behavior of VCC, NRES and VS is shown in

Figures 1-7 to Figure 1-10 (ramp-up and ramp-down).

tVCC

Off state

On state

Low

Fail- afe Mode

Normal Mode

EN High

Microcontroller

start-up time delay

Reset

time

Low

NRES

VCC

RXD

LIN bus

Bus wake-up filtering time

tbus

High

TXD

Low (strong pull-down)

High

TABLE 1-3:

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

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