參數(shù)資料
型號: MC33989
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
元件分類: CAN
英文描述: System Basis Chip with High Speed CAN Transceiver(帶高速CAN收發(fā)器的系統(tǒng)基片)
中文描述: 系統(tǒng)基礎(chǔ)芯片的高速CAN收發(fā)器(帶高速的CAN收發(fā)器的系統(tǒng)基片)
文件頁數(shù): 10/32頁
文件大?。?/td> 676K
代理商: MC33989
MC33989
10
MC33989
Figure 3. Transient test pulses for CANH and CANL
Figure 4. Transceiver AC characteristics
3.1
CAN error detection and wake up
The error and the wake up are reported in the CANR register.
3.1.1
Dominant State Time-out
This protection is based on the fact that all CAN signals can not have more than five bits in a row with the same state. In case
of a condition the Tx pin is stuck at 0v, the transceiver would hold the bus in dominant state making it impossible to the others
CAN modules to use the bus. The protection acts releasing the bus when a dominant signal with more than 350uS typical (
Tdout
time)
is present in the Tx signal. After entering the fault condition the driver is disabled. To clear this disabled state the CAN
transceiver needs to have its input going to recessive state.
3.1.2
Internal Error output flags
There are internal error flags to signals when one of the below condition happens. The errors are reported in CAN register.
Thermal protection activated (bit THERM)
Over Current detection in CANL or CANH pins (bit CUR).
Time-out condition for dominant state (bit TXF).
3.1.3
Sleep mode & Wake-up via CAN bus feature
The HSCAN interface enters in a low consumption mode when the “CAN sleep mode” is enabled. In this mode the HSCAN
module will have a 60uA consumption via internal 5V.
When in sleep mode the transmitter and the receiver are disabled, the only part of circuit which remains working is the wake
up module which contains a special low power receiver to check the bus lines and according to its activity generate a wake up
output signal. The conditions for the wake is meet when there are 3 valid pulses in a row. A valid signal must have a pulse width
bigger than 0.5us and no more than 0.5ms.
CAN H
CAN L
Transient Pulse
Generator
(note)
Gnd
Gnd
1nF
1nF
note: Waveform in accordance to ISO7637 part1, test pulses 1, 2, 3a and 3b.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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