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
Turn OFF
Turn OFF
Turn OFF due to V2.
No communication
OFF
VDD Temperature
Pre-Warning
Warning flag only.
Leave as is
No change
Turn OFF
No change
No change
OFF
VDD Overtemperature
Turn OFF
Turn OFF due to V2.
No communication
VDD Overcurrent
VDD regulator enters linear
mode. VDD undervoltage undervoltage reset occurs
reset may occurs. VDD
Turn OFF if VDD
If V2 is OFF, turn OFF
and no communication
Turn OFF if VDD
undervoltage reset occurs
overtemperature Pre-
Warning or shutdown may
occur
VDD Short Circuit
Watchdog Reset
VDD undervoltage reset
occurs. VDD
overtemperature Pre-
Warning or shutdown may
occur
Turn OFF
Turn OFF due to V2.
No communication
OFF
ON
Turn OFF
Turn OFF due to V2.
No communication
OFF
V2LOW (e.g., V2 < 4.0 V)
HS Overtemperature
HS Overcurrent
No change
No change
No change
V2 out of range
No change
Turn OFF due to V2 low
No change
No change
OFF
No change
No change
HS overtemperature
may occur
VSUP LOW
No change
No change
No change
No change
No change
No change
No change
CAN Overtemperature
Disable. As soon as
temperature falls, CAN is
re-enabled automatically
(46)
CAN Overcurrent
CANH Short to GND
CANH Short to VDD
CANH Short to VSUP
CANL Short to GND
CANL Short to VDD
CANL Short to VSUP
Notes
No change
No change
No change
No change
No change
No change
No change
No change
No change (47)
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
No communication (48)
Communication OK
Communication OK
Communication OK
No communication (48)
No communication (48)
46. Refer to descriptions of CANH and CANL short to GND, VDD, and VSUP elsewhere in table.
47. Peak current 150 mA during TXD dominant only. Due to loss of communication, CAN controller reaches bus OFF state. Average current
out of V2 is below 10 mA.
48. Overcurrent might be detected. THERM-CUR bit set in CAN register.
33742
Analog Integrated Circuit Device Data
Freescale Semiconductor
41
FREESCALE [ Freescale ]
