33902 Datasheet, PDF (24/31 Pages) Freescale Semiconductor, Inc – High Speed CAN Interface with Embedded 5.0 V Supply

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Description
CANSR (1,0)
Configure
00: CAN slew rate 0
11: CAN slew rate 0
01: CAN slew rate 1
10: CAN slew rate 2
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.
Description
Select between 2 wake-up mechanisms
CAN WU -
pattern
Configure
Reset
By P_SPI in Listen Only and Normal mode
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 V_DD low condition does not disable CAN and V_DD regulator, if V_SUV 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)
PASS ID(1,0),
METID(1,0)
Action
Set
Reset
Action
No disable of CAN and V_DD regulator in case of a V_DD low condition, and the V_SUV flag is set. ERR reports
a V_DD low condition. The P_SPI VDD low flag is set.
Report device internal identification
BUS dom
Description
Set
Reset
Detect a bus voltage dominant for a time longer than t_DOM.
This flag is set if the bus is detected to be in dominant for more than t_DOM
Entering low power mode, bus recessive P_SPI reading (Listen Only and Normal mode)
Action
No action, set ERR low in Normal mode
Description
Over-current occurred on the CANH or CANL driver
CAN cur
Set
Reset
In Normal mode, if the CANH or CANL current exceed the threshold (parameter)
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
24
Analog Integrated Circuit Device Data
Freescale Semiconductor