ATA6630 データシートの表示（PDF） - Atmel Corporation

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ATA6630

LIN Bus Transceiver with 3.3V (5V) Regulator and Watchdog

Atmel Corporation 

5.5 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 overtemperature 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 and even in this case the

current consumption is lower than 30µA in Sleep Mode and lower than 70µA in Silent Mode. If the short-circuit

disappears, the IC starts with a remote wake-up.

● Sleep or Silent Mode: During a floating condition on the bus the IC switches back to Sleep Mode/Silent Mode

automatically and thereby the current consumption is lower than 30µA/70µA.

● The reverse current is < 2µA at the LIN pin during loss of VBatt. 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 IVCClim. Because of undervoltage, 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 and 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 switching the IC into Normal Mode the TXD pin must be pulled to high longer than 10µs in order to activate the

LIN driver. This feature prevents the bus from being driven into dominant state when the IC is switched into Normal

Mode and TXD is low.

● If the WD_OSC pin has a short-circuit to GND and the NTRIG Signal has a period time > 27ms a reset is guaranteed.

● If the resistor at the WD_OSC pin is disconnected and the NTRIG Signal has a period time < 46ms a reset is

guaranteed.

● If there is no NTRIG signal and a short-circuit at WD_OSC to GND the NRES switches to low after 90ms. For an open

circuit (no resistor) at WD_OSC it switches to low after 390ms.

ATA6628/ATA6630 [DATASHEET]

17

9117I–AUTO–10/14

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