參數(shù)資料
型號(hào)： MCZ33742SEG
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
元件分類(lèi)： CAN
英文描述： System Basis Chip (SBC) with Enhanced High-Speed CAN Transceiver
中文描述： 系統(tǒng)基礎(chǔ)芯片的增強(qiáng)型（SBC）的高速CAN收發(fā)器
文件頁(yè)數(shù)： 35/65頁(yè)
文件大?。?/td> 1158K
代理商： MCZ33742SEG
Analog Integrated Circuit Device Data
Freescale Semiconductor
35
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.
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 21
.
Table 10. CAN Interface / 33742 Modes and Pin Status — Operation without Ballast on V2
(45)
Mode
CAN Mode
(Controlled by SPI)
V2 Voltage
TXD Pin
RXD Pin
CANH/CANL
(Disconnected from
Other Node)
CAN
Communication
Unpowered
–
0.0 V
LOW
LOW
Floating to GND
NO
Reset (with Ballast)
–
0.0 V
LOW
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
5.0 V
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
Sleep
0.0 V
LOW
LOW
Floating to GND
NO.
Wake-up if enabled
Stop
Sleep
0.0 V
LOW
LOW
Floating to GND
NO.
Wake-up if enabled
Notes
45.
See also
Figure 36,
page
55
.
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