mc33742 Freescale Semiconductor, Inc, mc33742 Datasheet - Page 41

• Manufacturer Part Number: mc33742
• Description: Mc33742 System Basis Chip Sbc With Enhanced High-speed Can Transceiver
• Manufacturer: Freescale Semiconductor, Inc

DEVICE FAULT OPERATION
Table 12. Fault / Warning
Analog Integrated Circuit Device Data
Freescale Semiconductor
Notes
V2LOW (e.g., V2 < 4.0 V)
46.
47.
48.
Table 12
VDD Overtemperature
CAN Overtemperature
CANH Short to VSUP
CANL Short to VSUP
HS Overtemperature
CANH Short to GND
CANH Short to VDD
CANL Short to GND
CANL Short to VDD
VDD Temperature
VDD Short Circuit
VDD Overcurrent
CAN Overcurrent
Watchdog Reset
HS Overcurrent
Fault / Warning
Pre-Warning
Refer to descriptions of CANH and CANL short to GND, VDD, and VSUP elsewhere in table.
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.
Overcurrent might be detected. THERM-CUR bit set in CAN register.
VSUP LOW
Battery Fail
describes the relationship between device fault or warning and the operation of the
VDD regulator enters linear
Warning or shutdown may
Warning or shutdown may
mode. VDD undervoltage
VDD undervoltage reset
reset may occurs. VDD
overtemperature Pre-
overtemperature Pre-
Warning flag only.
occurs. VDD
Leave as is
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
Turn OFF
Turn OFF
occur
occur
VDD
ON
undervoltage reset occurs
Turn OFF if VDD
V2 out of range
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
Turn OFF
Turn OFF
Turn OFF
Turn OFF
V2
(47)
temperature falls, CAN is
re-enabled automatically
Turn OFF due to V2 low
and no communication
If V2 is OFF, turn OFF
No communication
No communication
No communication
Turn OFF due to V2.
Turn OFF due to V2.
Turn OFF due to V2.
Turn OFF due to V2.
Disable. As soon as
Communication OK
Communication OK
Communication OK
No communication
No communication
No communication
No communication
No change
No change
No change
No change
CAN
(46)
FUNCTIONAL DEVICE OPERATION
VDD
(48)
(48)
(48)
, V2, CAN, and HS interface
undervoltage reset occurs
OPERATIONAL MODES
HS overtemperature
Turn OFF if VDD
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
No change
may occur
OFF
OFF
OFF
OFF
OFF
HS
33742
41
.