ATA6613 データシートの表示（PDF） - Atmel Corporation

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ATA6613

Microcontroller with LIN Transceiver, 5V Regulator and Watchdog

Atmel Corporation 

3.3.7

Input/Output Pin (TXD)

In Normal Mode the TXD pin is the microcontroller interface used to control the state of the LIN

output. TXD must be pulled to ground in order to have a low LIN-bus. If TXD is high or uncon-

nected (internal pull-up resistor), the LIN output transistor is turned off, and the bus is in

recessive state. During Fail-safe Mode, this pin is used as output. It is current-limited to < 8 mA.

and is latched to low if the last wake-up event was from pin WAKE or KL_15.

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 > 6 ms, the

LIN-bus driver is switched to recessive state.

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

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 5 kΩ to VCC. The AC characteristics can

be defined with an external load capacitor of 20 pF.

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 output capability.

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

mission is then possible, and the current consumption is reduced to IVS typ. 57 µA. 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 transmis-

sion 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 10 µA, 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 MODE pin 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 has to

be always connected to GND.

8 ATA6612/ATA6613

9111G–AUTO–05/10

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