ATA6560 datasheet(7/28 Pages) MICROCHIP

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 2018 Microchip Technology Inc.

DS20005991A-page 7

ATA6560/1

FIGURE 1-4:

Release of Transmission After Overtemperature Condition.

1.2.6

SHORT-CIRCUIT PROTECTION OF

THE BUS PINS

The CANH and CANL bus outputs are short-circuit

protected, either against GND or a positive supply

voltage. A current-limiting circuit protects the trans-

ceiver against damage. If the device heats up due to

a continuous short on CANH or CANL, the internal

overtemperature protection switches the bus trans-

mitter off.

1.2.7

RXD RECESSIVE CLAMPING

This fail-safe feature prevents the controller from

sending data on the bus if its RXD line is clamped to

high (for example, recessive). That is, if the RXD pin

cannot signal a dominant bus condition (for example,

because it is shorted to VCC), the transmitter within the

ATA6560/1 is disabled to avoid possible data collisions

on the bus. In Normal and Silent modes (only for the

ATA6560), the device permanently compares the state

of the HSC to the state of the RXD pin.

If the HSC indicates a dominant bus state for more than

tRC_det, without the RXD pin doing the same, a

recessive clamping situation is detected and the device

is forced into the Silent mode. This Fail-Safe mode is

released by entering either the Standby or the Unpow-

ered mode or if the RXD pin is showing a dominant (for

example, low) level again.

Failure

Overtemp

GND

TXD

Overtemperature

BUS VDIFF

(CANH-CANL)

V O

RXD

V O

GND

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