OPERATIONAL MODES CAN SIGNALS IN TXRX AND S" />
參數(shù)資料
型號： MC33742SDW
廠商： Freescale Semiconductor
文件頁數(shù)： 35/71頁
文件大?。?/td> 0K
描述： IC SYSTEM BASE W/LIN 28-SOIC
標(biāo)準(zhǔn)包裝： 26
應(yīng)用： 自動
接口： SPI
電源電壓： 5.5 V ~ 18 V
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
安裝類型： 表面貼裝
配用： KIT33742DWEVB-ND - KIT FOR 33742 SBC WITH EHSCAN
Analog Integrated Circuit Device Data
40
Freescale Semiconductor
33742
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
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.
Figure 21. CAN Signals in TXRX and Sleep Modes
CAN IN SLEEP MODE WITH WAKE-UP ENABLE
When the CAN interface is in Sleep mode with wake-up enable, the CAN bus traffic is detected. The CAN bus wake-up is a
pattern wake-up.
PATTERN WAKE-UP
In order to wake up the CAN interface, the following criteria must be fulfilled:
The CAN interface wake-up receiver must receive a series of three consecutive valid dominant pulses, each of which must be
longer than 500 ns and shorter than 500
s.
The distance between 2 pulses must be lower than 500
s.
The three pulses must occur within a time frame of 1.0 ms.
The pattern wake-up of the 33742 CAN interface allow wake-up by any CAN message content.
Figure 22 below illustrates the CAN signals during a CAN bus Sleep state and wake-up sequence.
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)
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