ATA6662 Ver la hoja de datos (PDF) - Atmel Corporation

Número de pieza

componentes Descripción

Fabricante

ATA6662

LIN Transceiver

Atmel Corporation 

ATA6662

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 10 µA. 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 automotive

transients or EMI. In Sleep Mode the INH pin is left floating. The internal termination

between pin LIN and pin VS is disabled. Only a weak pull-up current (typical 10 µA)

between pin LIN and pin VS is present. The 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. LIN communication is

switched off. The microcontroller of the application will then confirm the Normal Mode

by setting the EN pin to high.

4. Unpowered Mode

If you connect battery voltage to the application circuit, the voltage at the VS pin

increases according to the block capacitor. After VS is higher than the VS undervoltage

threshold VSth, the IC mode changes from Unpowered Mode to Fail-safe Mode.

Figure 3-1. Mode of Operation

Unpowered Mode

VBatt = 0V

b

a

a: VS > 5V

b: VS < 5V

c: Bus wake-up event

d: Wake-up from wake switch

Fail-safe Mode

INH: high (INH internal high-side switch ON)

b

Communication: OFF

b

EN = 1

d

Normal Mode

INH: high (INH HS switch ON)

Communication: ON

Go to sleep command

EN = 0; after 1 → 0 while TXD = 1

EN = 1

Local wake-up event

c

Sleep Mode

INH: high impedance (INH HS switch OFF)

Communication: OFF

Table 3-1. Table of Modes

Mode of Operation

Transceiver

Fail-safe

Off

Normal

On

Sleep

Off

INH

RXD

LIN

On

High, except after

wake up

Recessive

On

LIN depending

TXD depending

Off

High ohmic

Recessive

5

4916O–AUTO–05/10

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