ATA6612C データシートの表示（PDF） - Atmel Corporation

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ATA6612C

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

Atmel Corporation 

3.3.21.2 Local Wake-up via Pin Wake

A falling edge at the WAKE pin followed by a low level maintained for a certain time period (> tWAKE) results in a local

wake-up request. The device switches to fail-safe mode. The local wake-up request is indicated by a low level at the RXD

pin to generate an interrupt in the microcontroller and a strong pull down at TXD. When the wake pin is low, it is possible to

switch to silent or sleep mode via pin EN. In this case, the wake-up signal has to be switched to high >10µs before the

negative edge at WAKE starts a new local wake-up request.

3.3.21.3 Local Wake-up via Pin KL_15

A positive edge at pin KL_15 followed by a high voltage level for a certain time period (>tKL_15) results in a local wake-up

request. The device switches into the fail-safe mode. The extra long wake-up time ensures that no transients at KL_15

create a wake up. The local wake-up request is indicated by a low level at the RXD pin to generate an interrupt for the

microcontroller and a strong pull down at TXD. During high-level voltage at pin KL_15, it is possible to switch to silent or

sleep mode via pin EN. In this case, the wake-up signal has to be switched to low >250µs before the positive edge at KL_15

starts a new local wake-up request. With external RC combination, the time is even longer.

3.3.21.4 Wake-up Source Recognition

The device can distinguish between a local wake-up request (Wake or KL_15 pins) and a remote wake-up request (via LIN

bus). The wake-up source can be read on the TXD pin in fail-safe mode. A high level indicates a remote wake-up request

(weak pull up at the TXD pin); a low level indicates a local wake-up request (strong pull down at the TXD pin). The wake-up

request flag (signalled on the RXD pin), as well as the wake-up source flag (signalled on the TXD pin), is immediately reset if

the microcontroller sets the EN pin to high (see Figure 3-3 on page 12 and Figure 3-4 on page 13) and the IC is in normal

mode. The last wake-up source flag is stored and signalled in fail-safe mode at the TXD pin.

3.3.22

Fail-safe Features

● During a short-circuit at LIN to VBattery, the output limits the output current to IBUS_LIM. Due to the power dissipation, the

chip temperature exceeds TLINoff, and the LIN output is switched off. The chip cools down and after a hysteresis of

Thys, switches the output on again. RXD stays on high because LIN is high. During LIN over temperature switch-off,

the VCC regulator works independently.

● During a short-circuit from LIN to GND the IC can be switched into sleep or silent mode. If the short-circuit disappears,

the IC starts with a remote wake-up.

● The reverse current is very low <15µA at the LIN pin during loss of VBatt or GND. This is optimal behavior for bus

systems where some slave nodes are supplied from battery or ignition.

● During a short circuit at VCC, the output limits the output current to IVCCn. Because of under voltage, NRES switches

to low and sends a reset to the microcontroller. The IC switches into fail-safe mode. If the chip temperature exceeds

the value TVCCoff, the VCC output switches off. The chip cools down and after a hysteresis of Thys, switches the output

on again. Because of the fail-safe mode, the VCC voltage will switch on again although EN is switched off from the

microcontroller. The microcontroller can start with its normal operation.

● EN pin provides a pull-down resistor to force the transceiver into recessive mode if EN is disconnected.

● RXD pin is set floating if VBatt is disconnected.

● TXD pin provides a pull-up resistor to force the transceiver into recessive mode if TXD is disconnected.

● If TXD is short-circuited to GND, it is possible to switch to sleep mode via ENABLE after tdom >20ms.

● If the WD_OSC pin has a short-circuit to GND and the NTRIG signal has a period time >27ms, the watchdog runs with

an internal oscillator and guarantees a reset after the second NTRIG signal at the latest.

● If the resistor at WO_OSC pin is disconnected, the watchdog runs with an internal oscillator and guarantees a reset

after the second NTRIG signal at the latest.

16 ATA6612C/ATA6613C [DATASHEET]

9111L–AUTO–11/14

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