33742_08 Datasheet, PDF (46/70 Pages) Freescale Semiconductor, Inc – System Basis Chip with Enhanced High Speed CAN Transceiver

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
DEVICE FAULT OPERATION
Table 12 describes the relationship between device fault or warning and the operation of the VDD, V2, CAN, and HS interface.
Table 12. Fault / Warning
Fault / Warning
VDD
V2
CAN
HS
Battery Fail
VDD Temperature
Pre-warning
Turn OFF
Warning flag only.
Leave as is
Turn OFF
No change
Turn OFF due to V2.
No communication
No change
OFF
No change
VDD Over-temperature
Turn OFF
Turn OFF
VDD Over-current
VDD Short-circuit
VDD regulator enters linear
mode. VDD under-voltage
reset may occurs. VDD
over-temperature Pre-
warning or shutdown may
occur
Turn OFF if VDD under-
voltage reset occurs
VDD under-voltage reset
occurs. VDD over-
temperature Pre-warning or
shutdown may occur
Turn OFF
Turn OFF due to V2.
No communication
If V2 is OFF, turn OFF
and no communication
Turn OFF due to V2.
No communication
OFF
Turn OFF if VDD under-
voltage reset occurs
OFF
Watchdog Reset
V2LOW (e.g., V2 < 4.0V)
ON
No change
Turn OFF
V2 out of range
Turn OFF due to V2.
No communication
Turn OFF due to V2 low
OFF
No change
HS Over-temperature
No change
No change
No change
OFF
HS Over-current
No change
No change
No change
HS over-temperature
may occur
VSUP LOW
No change
No change
No change
No change
CAN Over-temperature
CAN Over-current
CANH Short to GND
No change
No change
No change
No change
No change
No change⁽⁵⁰⁾
Disable. As soon as
temperature falls, CAN is
re-enabled automatically
(49)
No communication⁽⁵¹⁾
No change
No change
No change
CANH Short to VDD
No change
No change
Communication OK
No change
CANH Short to VSUP
No change
No change
Communication OK
No change
CANL Short to GND
CANL Short to VDD
CANL Short to VSUP
No change
No change
No change
No change
No change
No change
Communication OK
No communication⁽⁵¹⁾
No communication⁽⁵¹⁾
No change
No change
No change
Notes
49. Refer to descriptions of CANH and CANL short to GND, VDD, and VSUP elsewhere in table.
50. Peak current 150mA during TXD dominant only. Due to loss of communication, CAN controller reaches bus OFF state. Average current
out of V2 is below 10mA.
51. Over-current might be detected. THERM-CUR bit set in CAN register.
33742
46
Analog Integrated Circuit Device Data
Freescale Semiconductor