ATA663201 datasheet(6/36 Pages) MICROCHIP

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ATA663201/03/31/54

DS20006075D-page 6

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1.2.3

SLEEP MODE (SBC ONLY)

A falling edge at EN while TXD is low switches the IC

into Sleep mode. The TXD signal has to be logic low

during the mode select window (Figure 1-6).

FIGURE 1-4:

SWITCHING TO SLEEP MODE

In order to avoid any influence to the LIN pin when

switching into Sleep mode, it is possible to switch EN

up to 3.2 μs earlier to low than TXD. The easiest and

best way to do this is by having two falling edges at

TXD and EN at the same time.

In Sleep mode, the transmission path is disabled.

Supply current from VBat is typically IVSsleep =9 μA.

The VCC regulator is switched off; NRES and RXD are

low. The internal termination resistor between the LIN

pin and VS pin is disabled to minimize the current con-

sumption in case the LIN pin is short-circuited to GND.

Only a weak pull-up current (typically 10 μA) between

the LIN pin and the VS pin is present. The Sleep mode

can be activated independently from the current level

on the LIN pin.

Voltage below the LIN pre-wake detection VLINL at the

LIN pin activates the internal LIN receiver and starts the

wake-up detection timer.

If the TXD pin is short-circuited to GND, it is possible to

switch to Sleep mode via EN after t > tdom.

1.2.4

FAIL-SAFE MODE (SBC ONLY)

The device automatically switches to Fail-Safe mode at

system power-up. The voltage regulator is switched on.

The NRES output remains low for tres =4 ms and

causes

the

microcontroller

reset.

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 low at NRES switches the IC into

Fail-Safe mode directly. During Fail-Safe mode, the

TXD pin is an output and, together with the RXD output

pin, signals the Fail-Safe source.

If the device enters the Fail-Safe mode coming from the

Normal mode (EN = 1) due to a VS undervoltage

condition (VVS <VVS_th_N_F_down), it is possible to

switch into sleep or silent mode by a falling edge at the

EN input. With this feature the current consumption can

be further reduced.

A wake-up event from either Silent or Sleep mode is

signaled to the microcontroller using the RXD pin and

the TXD pin. A VS undervoltage condition is also

signaled at these two pins. The coding is shown in

Table 1-2.

A wake-up event switches the IC to Fail-Safe mode.

Delay time

leep mode

td_sleep = maximum 20 μs

LIN switches directly to

ecessive mode

td = 3.2 μs

LIN

VCC

NRES

TXD

Sleep Mode

Normal Mode

Mode select window

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