ATA6663 Ver la hoja de datos (PDF) - Atmel Corporation

Número de pieza

componentes Descripción

Fabricante

ATA6663

LIN Transceiver

Atmel Corporation 

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 VBatt is typically 10µA. A wake-up signal from the LIN bus or via

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

(tWAKE), LIN (tBUS) and EN (tsleep,tnom) prevent unwanted wake-up events due to auto-

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

termination between pin LIN and pin VS is disabled. Only a weak pull-up current (typ-

ical 10 µA) between pin LIN and pin VS is present. Sleep mode can be activated

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 VS level when VS

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

Power-up

a

Fail-safe Mode

Communication: OFF

RXD: see table of Modes

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

b

a: Power-up (VS > 3V)

b: VS < 5V

c: Bus wake-up event

d: Wake-up from wake switch

b

EN = 1

& NOT b

Normal Mode

INH: high (INH HS switch ON)

Communication: ON

EN = 0

EN = 1

Go to sleep command

Local wake-up event

c or d

Sleep Mode

INH: high impedance (INH HS switch OFF)

Communication: OFF

9146D–AUTO–09/10

Table 3-1. Table of Operation Modes

Mode of Operation

Transceiver

Fail-safe

Off

Normal

On

Sleep

Off

INH

On, except

VS < 5V

On

Off

RXD

High, except after

wake-up

LIN depending

High ohmic

LIN

Recessive

TXD depending

Recessive

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.

5

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