33902 datasheet(24/31 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33902

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

CANSR (1,0)

Description

00: CAN slew rate 0

11: CAN slew rate 0

01: CAN slew rate 1

10: CAN slew rate 2

Configure

By P_SPI in Listen Only and Normal mode

Reset

Entering low power mode

Action

Change CAN slew rate (ref to parametric). Default is 00.

CAN WU -

pattern

Description

Select between 2 wake-up mechanisms

Configure

By P_SPI in Listen Only and Normal mode

Reset

Leaving low power mode

Action

When high wake-up occurs after 1 pulse of a minimum of 4.0

μs (parameter). When low, (default) wake-

up occurs after 3 pulses of a minimum of 600ns (parameters).

CRANK

Description

When this flag is set, the VDD low condition does not disable CAN and VDD regulator, if VSUV flag is set.

Configure

By P_SPI in Normal and Listen Only modes

Reset

Entering low power mode or P_SPI write (Listen Only and Normal mode)

Action

No disable of CAN and VDD regulator in case of a VDD low condition, and the VSUV flag is set. ERR reports

a VDD low condition. The P_SPI VDD low flag is set.

PASS ID(1,0),

METID(1,0)

Set

Report device internal identification

Reset

Action

BUS dom

Description

Detect a bus voltage dominant for a time longer than tDOM.

Set

This flag is set if the bus is detected to be in dominant for more than tDOM

Reset

Entering low power mode, bus recessive P_SPI reading (Listen Only and Normal mode)

Action

No action, set

ERR low in Normal mode

CAN cur

Description

Over-current occurred on the CANH or CANL driver

Set

In Normal mode, if the CANH or CANL current exceed the threshold (parameter)

Reset

Entering low power mode, the CAN current below threshold + P_SPI reading (Listen Only and Normal

mode)

Action

By default no action. If the

ERR-EXT bit is set, the ERR is set low.

33902 Datasheet(PDF) 24 Page - Freescale Semiconductor, Inc

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