5

9146D–AUTO–09/10

Atmel ATA6663/ATA6664

3.11

Operation Modes

1.

Normal Mode

This is the normal transmitting and receiving mode. All features are available.

2.

Sleep Mode

In this mode the transmission path is disabled and the device is in low-power mode.

Supply current from V

pin WAKE will be detected and will switch the device to fail-safe mode. If EN then

switches to high, normal mode is activated. Input debounce timers at pin WAKE

(t

motive transients or EMI. In sleep mode the INH pin remains floating. The internal

termination between pin LIN and pin V

ical 10 µA) between pin LIN and pin V

independently from the actual level on pin LIN or WAKE.

3.

Fail-safe Mode

At system power-up or after a wake-up event, the device automatically switches to

fail-safe mode. It switches the INH pin to a high state, to the V

exceeds 5V. LIN communication is switched off. The microcontroller of the application

will then confirm normal mode by setting the EN pin to high.

Figure 3-1.

Mode of Operation

Wake-up events from sleep mode:

•LIN bus

•EN pin

• WAKE pin

• VS undervoltage

Figure 3-1 on page 5, Figure 3-2 on page 6 and Figure 3-5 on page 8 show the details of

wake-up operations.

Table 3-1.

Table of Operation Modes

Mode of Operation

Transceiver

INH

RXD

LIN

Fail-safe

Off

On, except

VS < 5V

High, except after

wake-up

Recessive

Normal

On

On

LIN depending

TXD depending

Sleep

Off

Off

High ohmic

Recessive

Fail-safe Mode

Communication: OFF

RXD: see table of Modes

INH: high (INH HS switch ON) if VS > 5V

a

Sleep Mode

INH: high impedance (INH HS switch OFF)

Communication: OFF

EN = 0

Go to sleep command

EN = 1

Local wake-up event

a: Power-up (V

b: V

c: Bus wake-up event

d: Wake-up from wake switch

b

EN = 1

& NOT b

b

c or d

Normal Mode

INH: high (INH HS switch ON)

Communication: ON

Power-up