ATA6616(2012) データシートの表示（PDF） - Atmel Corporation

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ATA6616
(Rev.:2012)

8K/16K Flash Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

Atmel ATA6616/ATA6617

3.3.8

TXD Dominant Time-out Function

The TXD input has an internal pull-up resistor. An internal timer prevents the bus line from

being driven permanently in dominant state. If TXD is forced to low for longer than tDOM > 6ms,

the LIN-bus driver is switched to recessive state.

To reactivate the LIN-bus driver, switch TXD to high (> 10µs).

3.3.9

3.3.10

Output Pin (RXD)

The Output pin reports the state of the LIN bus to the microcontroller. LIN high (recessive

state) is reported by a high level at RXD; LIN low (dominant state) is reported by a low level at

RXD. The output has an internal pull-up resistor with typically 5kΩ to VCC. The AC character-

istics can be defined with an external load capacitor of 20pF.

The output is short-circuit protected. RXD is switched off in Unpowered Mode (i.e., VS = 0V).

Enable Input Pin (EN)

The Enable Input pin controls the operation mode of the device. If EN is high, the circuit is in

Normal Mode with transmission paths from TXD to LIN and from LIN to RXD both active. The

VCC voltage regulator operates with 5V/85mA output capability.

If EN is switched to low while TXD is still high, the device is forced to Silent Mode. No data

transmission is then possible, and the current consumption is reduced to IVS typ. 57µA. The

VCC regulator has its full functionality.

If EN is switched to low while TXD is low, the device is forced to Sleep Mode. No data trans-

mission is possible, and the voltage regulator is switched off.

3.3.11

Wake Input Pin (WAKE)

The Wake Input pin is a high-voltage input used to wake up the device from Sleep Mode or

Silent Mode. It is usually connected to an external switch in the application to generate a local

wake-up. A pull-up current source, typically 10µA, is implemented.

If a local wake-up is not needed for the application, connect the Wake pin directly to the VS

pin.

3.3.12

Mode Input Pin (MODE)

Connect the MODE pin directly or via an external resistor to GND for normal watchdog opera-

tion. To debug the software of the connected microcontroller, connect the MODE pin to VCC

and the watchdog is switched off.

3.3.13

TM Input Pin

The TM pin is used for final production measurements at Atmel. In normal application, it must

always be connected to GND.

7

9132F–AUTO–02/12

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