33903 datasheet(85/104 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33903/4/5

SERIAL PERIPHERAL INTERFACE

FLAGS AND DEVICE STATUS

CAN

CAN driver

state

Description

Report real time CAN bus driver state: 1 if Driver is enable, 0 if driver disable

Set / Reset condition

Set: CAN driver is enable. Reset: CAN driver is disable. Driver can be disable by SPI command (ex

CAN set in RXD only Mode) or following a failure event (ex: TXD Dominant). Flag read SPI command

(0x2180) do not clear the flag, as it is “real time” information.

CAN receiver

state

Description

Report real time CAN bus receiver state: 1 if Enable, 0 if disable

Set / Reset condition

Set: CAN bus receiver is enable. Reset: CAN bus receiver is disable. Receiver disable by SPI

command (ex: CAN set in sleep Mode). Flag read SPI command (0x2180) do not clear the flag, as it

is “real time” information.

CAN WU

enable

Description

Report real time CAN bus Wake-Up receiver state: 1 if WU receiver is enable, 0 if disable

Set / Reset condition

Set: CAN Wake-Up receiver is enable. Reset: CAN Wake-Up receiver is disable. Wake-Up receiver

is controlled by SPI, and is active by default after device Power ON. SPI command (0x2180) do not

change flag state.

CAN

Wake-Up

Description

Report that Wake-Up source is CAN

Set / Reset condition

Set: after CAN wake detected. Reset: Flag read (SPI)

CAN Over-

temp

Description

Report that the CAN interface has reach over-temperature threshold.

Set / Reset condition

Set: CAN thermal sensor above threshold. Reset: thermal sensor below threshold and flag read (SPI)

RXD low

Description

Report that RXD pin is shorted to GND.

Set / Reset condition

Set: RXD low failure detected. Reset: failure recovered and flag read (SPI)

Rxd high

Description

Report that RXD pin is shorted to recessive voltage.

Set / Reset condition

Set: RXD high failure detected. Reset: failure recovered and flag read (SPI)

TXD dom

Description

Report that TXD pin is shorted to GND.

Set / Reset condition

Set: TXD low failure detected. Reset: failure recovered and flag read (SPI)

Bus Dom

clamp

Description

Report that the CAN bus is dominant for a time longer than tDOM

Set / Reset condition

Set: Bus dominant clamp failure detected. Reset: failure recovered and flag read (SPI)

CAN Over-

current

Description

Report that the CAN current is above CAN over-current threshold.

Set / Reset condition

Set: CAN current above threshold. Reset: current below threshold and flag read (SPI)

CAN_UF

Description

Report that the CAN failure detection has not yet identified the bus failure

Set / Reset condition

Set: bus failure pre detection. Reset: CAN bus failure recovered and flag read

CAN_F

Description

Report that the CAN failure detection has identified the bus failure

Set / Reset condition

Set: bus failure complete detetction.Reset: CAN bus failure recovered and flag read

CANL

to VBAT

Description

Report CAN L short to VBAT failure

Set / Reset condition