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参数资料
型号： MC33742DWR2
厂商： Freescale Semiconductor
文件页数： 33/71页
文件大小： 0K
描述： IC SYSTEM BASE W/LIN 28-SOIC
标准包装： 1,000
应用： 自动
接口： SPI
电源电压： 5.5 V ~ 18 V
封装/外壳： 28-SOIC（0.295"，7.50mm 宽）
供应商设备封装： 28-SOIC W
包装： 带卷 (TR)
安装类型： 表面贴装
配用： KIT33742DWEVB-ND - KIT FOR 33742 SBC WITH EHSCAN
Analog Integrated Circuit Device Data
Freescale Semiconductor
39
33742
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
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 modes are set via the CAN SPI register.
In CAN Sleep mode (with wake-up enable or disable), the 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 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-
impedance mode to ground.
Standby with
External Ballast
Normal or Sleep
0.0 V
LOW
Floating to GND
NO
Sleep
0.0 V
LOW
Floating to GND
NO.
Wake-up if enabled
Stop
Sleep
0.0 V
LOW
Floating to GND
NO.
Wake-up if enabled
Notes
45.
See also Figure 31, page 57.
46.
The state of the RXD pin is dependant upon: 1) the V2 voltage, 2) the external circuitry connected to RXD, (i.e. the MCU RXD pin), and
3) any external pull-up between RXD and the 5.0 V supply.
Table 10. CAN Interface/33742 Modes and Pin Status—Operation without Ballast on V2 (47)
Mode
CAN Mode
(Controlled by SPI)
V2 Voltage
TXD Pin
RXD Pin(48)
CANH/CANL
(Disconnected from
Other Node)
CAN
Communication
Unpowered
–
0.0 V
LOW
Floating to GND
NO
Reset (without Ballast)
–
5.0 V
LOW
Floating to GND
NO
Normal Request without
Ballast.
V2 Connected to VDD
–
5.0 V
LOW
5.0 V
Floating to GND
NO
Standby without External
Ballast,.
V2 connected to VDD
Normal or Sleep
5.0 V
0.0 V
5.0 V
Floating to GND
NO
Normal without External
Ballast.
V2 Connected to VDD
Normal
Slew Rate 0, 1, 2,3
5.0 V
Bus Recessive
CANH = CANL = 2.5 V
YES
Normal without External
Ballast,.
V2 Connected to VDD
Sleep
5.0 V
0.0 V
5.0 V
Floating to GND
NO
Sleep
0.0 V
LOW
Floating to GND
NO.
Wake-up if enabled
Stop
Sleep
5.0 V
LOW
Floating to GND
NO.
Wake-up if enabled
Notes
47.
See also Figure 36, page 60.
48.
The state of the RXD pin is dependant upon: 1) the V2 voltage, 2) the external circuitry connected to RXD, (i.e. the MCU RXD pin), and
3) any external pull-up between RXD and the 5.0 V supply.
Table 9. CAN Interface/33742S Modes and Pin Status—Operation with Ballast on V2(45)
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