MC33742DW Freescale Semiconductor, MC33742DW Datasheet - Page 40

• Manufacturer Part Number: MC33742DW
• Description: IC SYSTEM BASE W/LIN 28-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MC33742DW

• Applications: Automotive
• Interface: SPI
• Voltage - Supply: 5.5 V ~ 18 V
• Package / Case: 28-SOIC (7.5mm Width)
• Mounting Type: Surface Mount
• For Use With: KIT33742DWEVB - KIT FOR 33742 SBC WITH EHSCAN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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 5.0V or turned off. When the
CAN is in Sleep mode, the current sourced from V2 is
CAN IN SLEEP MODE WITH WAKE-UP ENABLE
enable, the CAN bus traffic is detected. The CAN bus wake-
up is a pattern wake-up.
PATTERN WAKE-UP
must be fulfilled:
• The CAN interface wake-up receiver must receive a series
40
33742
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
2.5V
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
When the CAN interface is in Sleep mode with wake-up
In order to wake up the CAN interface, the following criteria
of three consecutive valid dominant pulses, each of which
must be longer than 500ns and shorter than 500μs.
TXD
CANH
CANL
RXD
CANH Dominant
CANL Dominant
CAN in TXRX Mode
CANL/CANH Recessive
Figure 21. CAN Signals in TXRX and Sleep Modes
extremely low. In most cases the V2 voltage is off; however,
the CAN can be placed into Sleep mode even with 5.0V
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
• The distance between 2 pulses must be lower than 500μs.
• The three pulses must occur within a time frame of 1.0ms.
wake-up by any CAN message content.
bus Sleep state and wake-up sequence.
(Wake-up Enable or Disable)
In CAN Sleep mode, the CANH and CANL drivers are
When the CAN interface is set back into TXRX mode by an
The pattern wake-up of the 33742 CAN interface allow
Figure 22
CAN in Sleep Mode
Ground
below illustrates the CAN signals during a CAN
Figure
Analog Integrated Circuit Device Data
21.
(Controlled by SPI Command)
Freescale Semiconductor
CAN in TXRX Mode