ATA6661 データシートの表示（PDF） - Atmel Corporation

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ATA6661

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3.7 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 Rx both active. If EN = 0, the device

is switched to sleep mode and no transmission 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 next section “Inhibit Output Pin (INH)” ).

During sleep mode the device is still supplied from the battery voltage. The supply current is typ-

ically 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.

3.8 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. The

RDSon of the high-side output is < 1 kΩ.

3.9 Wake-up Input Pin (WAKE)

This pin is a high-voltage input used to wake-up the device from sleep mode. It is usually con-

nected to an external switch in the application to generate a local wake-up. If you do not need a

local wake-up in your application, connect pin WAKE directly to pin VS. 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 typical –3 µA.

Wake-up events from sleep mode:

• LIN bus

• EN pin

• WAKE pin

Figure 3-1 on page 6, Figure 3-2 and Figure 3-3 on page 7 show details of wake-up operations.

4 ATA6661

4729M–AUTO–02/09

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