mc33742 Freescale Semiconductor, Inc, mc33742 Datasheet - Page 35

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

Table 10. CAN Interface / 33742 Modes and Pin Status — Operation without Ballast on V2
CAN SLEEP MODE
• Sleep mode with CAN wake-up enable: detection of
• Sleep mode with CAN wake-up disable: no detection of
CAN interface is internally supplied from the VSUP pin. The
voltage at V2 pin can be either 5.0 V or turned off. When the
CAN is in Sleep mode, the current sourced from V2 is
Analog Integrated Circuit Device Data
Freescale Semiconductor
V2 connected to VDD
Notes
Reset (with Ballast)
45.
V2 Connected to
External Ballast,.
V2 Connected to
External Ballast,.
V2 Connected to
The 33742 offers two CAN Sleep modes:
incoming CAN message and SBC wake-up.
incoming CAN message.
The CAN Sleep modes are set via the CAN SPI register.
In CAN Sleep mode (with wake-up enable or disable), the
Normal Request
External Ballast.
Standby without
without Ballast.
Normal without
Normal without
Unpowered
See also
Mode
Sleep
VDD
VDD
VDD
Stop
Figure 36,
(Controlled by SPI)
Slew Rate 0, 1, 2,3
Normal or Sleep
CAN Mode
page 55.
Normal
Sleep
Sleep
Sleep
–
–
–
V2 Voltage
0.0 V
0.0 V
5.0 V
5.0 V
5.0 V
5.0 V
0.0 V
0.0 V
TXD Pin
LOW
LOW
LOW
0.0 V
5.0 V
0.0 V
LOW
LOW
extremely low. In most cases the V2 voltage is off; however,
the CAN can be placed into Sleep mode even with 5.0 V
applied on V2.
disabled, and the receiver is also disabled. CANH and CANL
are high-impedance mode to ground.
CAN SIGNALS IN TXRX AND SLEEP MODES
SPI command, CAN H and CANL are set in recessive level.
This is illustrated in
In CAN Sleep mode, the CANH and CANL drivers are
When the CAN interface is set back into TXRX mode by an
RXD Pin
5.0 V
5.0 V
5.0 V
5.0 V
LOW
LOW
LOW
LOW
Figure 21
CANH = CANL = 2.5 V
(Disconnected from
Floating to GND
Floating to GND
Floating to GND
Floating to GND
Floating to GND
Floating to GND
Floating to GND
Bus Recessive
CANH/CANL
Other Node)
FUNCTIONAL DEVICE OPERATION
(45)
.
OPERATIONAL MODES
Wake-up if enabled
Wake-up if enabled
Communication
CAN
YES
NO.
NO.
NO
NO
NO
NO
NO
33742
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