3.9
Output Pin (RXD)
This 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 characteristics 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).
3.10 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 3.3V/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 transmission is possible, and the
voltage regulator is switched off.
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 in the application, connect the Wake pin directly to the VS pin.
3.12 Mode Input Pin (MODE)
Connect the MODE pin directly or via an external resistor to GND for normal watchdog operation. To debug the software of
the connected microcontroller, connect MODE pin to 3.3V/5V and the watchdog is switched off.
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.
3.14 KL_15 Pin
The KL_15 pin is a high-voltage input used to wake up the device from Sleep or Silent Mode. It is an edge sensitive pin (low-
to-high transition). It is usually connected to ignition to generate a local wake-up in the application when the ignition is
switched on. Although KL_15 pin is at high voltage (VBatt), it is possible to switch the IC into Sleep or Silent Mode. Connect
the KL_15 pin directly to GND if you do not need it. A debounce timer with a typical TdbKl_15 of 160µs is implemented.
The input voltage threshold can be adjusted by varying the external resistor due to the input current IKL_15. To protect this pin
against voltage transients, a serial resistor of 47kΩ and a ceramic capacitor of 100nF are recommended. With this RC
combination you can increase the wake-up time TwKL_15 and, therefore, the sensitivity against transients on the ignition
Kl.15.
You can also increase the wake-up time using external capacitors with higher values.
3.15 INH Output Pin
The INH Output pin is used to switch an external voltage regulator on during Normal or Fail-safe Mode. The INH pin is
switched off in Sleep or Silent Mode. It is possible to switch off the external 1kΩ master resistor via the INH pin for master
node applications. The INH pin is switched off during VCC undervoltage reset.
3.16 Reset Output Pin (NRES)
The Reset Output pin, an open drain output, switches to low during VCC undervoltage or a watchdog failure.
ATA6622C/ATA6624C/ATA6626C [DATASHEET]
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