CAN BUS FAULT DIAGNOSTIC Once the error is detected t" />
參數(shù)資料
型號： MCZ33903BS5EK
廠商： Freescale Semiconductor
文件頁數(shù)： 64/106頁
文件大?。?/td> 0K
描述： IC SBC CAN HS 5.0V 32SOIC
標(biāo)準(zhǔn)包裝： 42
應(yīng)用： 系統(tǒng)基礎(chǔ)芯片
接口： CAN，LIN
電源電壓： 5.5 V ~ 28 V
封裝/外殼： 32-SSOP（0.295"，7.50mm 寬）裸露焊盤
供應(yīng)商設(shè)備封裝： 32-SOICW 裸露焊盤
包裝： 管件
安裝類型： 表面貼裝
Analog Integrated Circuit Device Data
60
Freescale Semiconductor
33903/4/5
CAN INTERFACE
CAN BUS FAULT DIAGNOSTIC
Once the error is detected the driver is disabled and the
error is reported via SPI in CAN register.
Recovery Condition
The internal recovery is done by sampling a correct low
level at TXD as shown in the following illustration.
Figure 40. RXD Path Simplified Schematic, RXD Short to VDD Detection
TXD PERMANENT DOMINANT
Principle
If the TXD is set to a permanent low level, the CAN bus is
set into dominant level, and no communication is possible.
The device has a TXD permanent timeout detector. After the
timeout (TDOUT), the bus driver is disabled and the bus is
released into a recessive state. The TXD permanent flag is
set.
Recovery
The TXD permanent dominant is used and activated when
there is a TXD short to RXD. The recovery condition for a
TXD permanent dominant (recovery means the re-activation
of the CAN drivers) is done by entering into a Normal mode
controlled by the MCU or when TXD is recessive while RXD
change from recessive to dominant.
TXD TO RXD SHORT-CIRCUIT
Principle
When TXD is shorted to RXD during incoming dominant
information, RXD is set to low. Consequently, the TXD pin is
low and drives CANH and CANL into a dominant state. Thus
the bus is stuck in dominant. No further communication is
possible.
Detection and Recovery
The TXD permanent dominant timeout will be activated and
release the CANL and CANH drivers. However, at the next
incoming dominant bit, the bus will then be stuck in dominant
again. The recovery condition is same as the TXD dominant
failure
IMPORTANT INFORMATION FOR BUS DRIVER
REACTIVATION
The driver stays disabled until the failure is/are removed
(TXD and/or RXD is no longer permanent dominant or
recessive state or shorted) and the failure flags cleared
(read). The CAN driver must be set by SPI in TXD/RXD mode
in order to re enable the CAN bus driver.
CANL&H
Diff output
RXD output
RXD short to VDD
RXD flag
RXD flag latched
Sampling
The RXD flag is not the RXPR bit in the LPC register, and neither is the CANF in the INTR register.
RXD no longer shorted to VDD
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