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参数资料
| 型号： | 33742S |
| 厂商： | Motorola, Inc. |
| 元件分类： | CAN |
| 英文描述： | System Basis Chip (SBC) with Enhanced High-Speed CAN Transceiver |
| 中文描述： | 系统基础芯片的增强型（SBC）的高速CAN收发器 |
| 文件页数： | 31/52页 |
| 文件大小： | 1087K |
| 代理商： | 33742S |
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MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33742
31
CAN Sleep Mode
The 33742 offers two CAN Sleep modes:
Sleep mode with CAN wake-up enable: detection of
incoming CAN message and SBC wake-up.
Sleep mode with CAN wake-up disable: no detection of
incoming CAN message.
The CAN Sleep mode is done via the CAN SPI register.
In CAN Sleep mode (with wake-up enable or disable), the
CAN interface is internally supplied from the V
SUP
terminal. The
voltage at V2 terminal can be either 5.0 V or turned off. When
the CAN is in Sleep mode, the current sourced from V2 is
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.
In CAN Sleep mode, the CANH and CANL drivers are
disabled, and the receiver is also disabled. CANH and CANL
are high ohmic termination to ground.
CAN Signals in TXRX and Sleep Modes
When the CAN interface is set back into TXRX mode by an
SPI command, CAN H and CANL are set in recessive level.
This is illustrated in
Figure 18
.
Figure 18. CAN Signals in TXRX and Sleep Modes
Table 5. CAN Interface/33742 Modes and Terminal Status—Operation without Ballast on V2
(Note 45)
Mode
CAN Mode
(Controlled by SPI)
V2 Voltage
TXD Terminal
RXD Terminal
CANH/CANL
(Disconnected
from Other Node)
CAN
Communication
Unpowered
–
0 V
LOW
LOW
Floating to GND
NO
Reset (with Ballast)
–
0 V
LOW
LOW
Floating to GND
NO
Normal Request
without Ballast.
V2 Connected to V
DD
–
5.0 V
LOW
5.0 V
Floating to GND
NO
Standby without
External Ballast, V2
connected to V
DD
Normal or Sleep
5.0 V
0 V
5.0 V
Floating to GND
NO
Normal without
External Ballast. V2
Connected to V
DD
Normal
Slew Rate 0, 1, 2,3
5.0 V
5.0 V
5.0 V
Bus Recessive
CANH = CANL =
2.5 V
YES
Normal without
External Ballast, V2
Connected to V
DD
Sleep
5.0 V
0 V
5.0 V
Floating to GND
NO
Sleep
Sleep
0 V
LOW
LOW
Floating to GND
NO.
Wake-up if enabled
Stop
Sleep
0 V
LOW
LOW
Floating to GND
NO.
Wake-up if enabled
Notes
45.
See also
Figure 29,
page 47.
CANL
CANH
TXD
RXD
Ground
2.5 V
CANL Dominant
CANH Dominant
CANL/CANH Recessive
CAN in TXRX Mode
CAN in Sleep Mode
(Wake-Up Enable or Disable)
CAN in TXRX Mode
(Controlled by SPI Command)
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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