ATA6663-FAQW datasheet(9/20 Pages) ATMEL

9 / 20 page

9146D–AUTO–09/10

Atmel ATA6663/ATA6664

3.15

Fail-safe Features

• During a short-circuit at LIN to V

BAT, the output limits the output current to IBUS_LIM. Due

to the power dissipation, the chip temperature exceeds T

off, and the LIN output is switched

off. The chip cools down, and after a hysteresis of T

hys, it switches the output on again.

• During a short-circuit from LIN to GND the IC can be switched to sleep mode, and even in

this case the current consumption is lower than 45µA. When the short-circuit has elapsed,

the IC starts with a remote wake-up.

•If the Atmel

® ATA6663/ATA6664 is in sleep mode and a floating condition occurs on the

bus, the IC switches back to sleep mode automatically. The current consumption is lower

than 45µA in this case.

• The reverse current is < 2µA at pin LIN during loss of V

BAT. This is the best behavior for bus

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

• Pin EN provides a pull-down resistor to force the transceiver into sleep mode if EN is

disconnected

• Pin RXD is set floating if V

BAT is disconnected

• Pin TXD provides a pull-down resistor to provide a static low if TXD is disconnected

• The INH output transistor is protected by temperature monitoring

ATA6663-FAQW Datasheet(PDF) 9 Page - ATMEL Corporation