mc33742 Freescale Semiconductor, Inc, mc33742 Datasheet - Page 55

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

Analog Integrated Circuit Device Data
Freescale Semiconductor
POWER-UP AND VDD GOING LOW WITH SLEEP MODE AS DEFAULT LOW POWER MODE IS SELECTED
overcurrent or short circuit (for instance, short to 4.0 V), and if the low power mode previously selected was Sleep mode and if
the BATFAIL flag has been cleared, the 33742 enters in Reset mode for a time period of 100 ms. The WDOG pin stays HIGH,
but the high level (Voh) follows VDD level. The RST and INT pins are low. After 100 ms the 33742 goes into Sleep mode, and
the VDD and V2 are off.
.
The first part of Figure 35 is identical to Figure 34. If VDD is pulled below the VDD under voltage reset (typ 4.6V), say by an
Figure 35 shows an example wherein VDD is shorted to 4.0 V, and after 100 ms the 33742 enters Sleep mode.
CAN Connector
Legend
R5: 60 Ω
CL, CH: 220 pF
CANH
CANL
Figure 36. CAN Bus Standard Termination
VDD
VDD
SPI
SPI
RST
RST
INT
INT
WD
WD
(CS)
(CS)
SBC in
SBC in
RESET
RESET
mode
mode
CH
CL
Figure 35. Undervoltage at VDD. Sleep mode selected.
SBC in Normal request
SBC in Normal request
& reset modes
& reset modes
Reset each 350 ms
Reset each 350 ms
R5
CANH (33742)
CANL (33742)
SBC in Normal
SBC in Normal
mode
mode
Watchdog refresh
Watchdog refresh
CANH
CANL
CAN Connector
Legend
R6, R7: 30 Ω
CL, CH: 220 pF
CS: > 470 pF
SBC in Reset mode for
SBC in Reset mode for
100ms, then enter
100ms, then enter
Sleep mode
Sleep mode
Figure 37. CAN Bus Split Termination
Under voltage at VDD
Under voltage at VDD
100 ms
100 ms
SBC in Sleep mode
SBC in Sleep mode
CH
CL
TYPICAL APPLICATIONS
CS
R6
R7
CANH (33742)
CANL (33742)
33742
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