OPERATIONAL MODES CAN SLEEP MODE The 33742 " />
參數(shù)資料
型號(hào)： MCZ33742SEG
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 33/71頁(yè)
文件大?。?/td> 0K
描述： IC SYSTEM BASIS CHIP CAN 28-SOIC
標(biāo)準(zhǔn)包裝： 26
應(yīng)用： 自動(dòng)
電流 - 電源： 42mA
電源電壓： 5.5 V ~ 18 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 管件
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.
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.
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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