ATA6662 データシートの表示（PDF） - Atmel Corporation

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ATA6662

LIN Transceiver

Atmel Corporation 

3.8 Enable Input Pin (EN)

This pin controls the Operation Mode of the interface. If EN = 1, the interface is in Normal Mode,

with the transmission path from TXD to LIN and from LIN to RXD both active. At a falling edge

on EN, while TXD is already set to high, the device is switched to Sleep Mode and no transmis-

sion is possible. In Sleep Mode, the LIN bus pin is connected to VS with a weak pull-up current

source. The device can transmit only after being woken up (see Section 3.9, “Inhibit Output Pin

(INH)” ).

During Sleep Mode the device is still supplied from the battery voltage. The supply current is

typically 10 µA. The pin EN provides a pull-down resistor in order to force the transceiver into

Sleep Mode in case the pin is disconnected.

3.9 Inhibit Output Pin (INH)

This pin is used to control an external switchable voltage regulator having a wake-up input. The

inhibit pin provides an internal switch towards pin VS. If the device is in Normal Mode, the inhibit

high-side switch is turned on and the external voltage regulator is activated. When the device is

in Sleep Mode, the inhibit switch is turned off and disables the voltage regulator.

A wake-up event on the LIN bus or at pin WAKE will switch the INH pin to the VS level. After a

system power-up (VS rises from zero), the pin INH switches automatically to the VS level.

3.10

Wake-up Input Pin (WAKE)

This pin is a high-voltage input used to wake the device up from Sleep Mode. It is usually

connected to an external switch in the application to generate a local wake-up. A pull-up current

source with typically –10 µA is implemented. The voltage threshold for a wake-up signal is 3V

below the VS voltage with an output current of typically –3 µA.

If you do not need a local wake-up in your application, connect pin WAKE directly to pin VS.

4 ATA6662

4916O–AUTO–05/10

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