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參數(shù)資料
| 型號： | L9669 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | CAN |
| 英文描述： | FAULT TOLERANT CAN TRANSCEIVER |
| 中文描述： | 容錯(cuò)CAN收發(fā)器 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大小： | 205K |
| 代理商： | L9669 |
9/13
L9669
1.3 Error Management
Ten different errors on the physical buslines can be distinguished:
Not all of these errors leads to a breakdown of the whole communication. So the errors can be categorized into
“negligible” (severity 0), “problematic” (severity 1) and “severe” (severity 2).
Negligible Errors
Transmitter
Error 1, 2, 4 or 8:
Receiver
Error 1, 2, 5 or 9:
In all cases data still can be transmitted in differential mode.
In all cases data still can be received in differential mode.
Problematic Errors
Transmitter
Error 3 or 6:
Receiver
Error 3 or 6:
Data are transmitted using the remaining dataline (single wire).
Data are received using the remaining dataline (single wire).
Severe Errors
Transmitter
Error 5 or 9:
Error 7:
Error 10:
Receiver
Error 7:
Error 4 or 8:
Error 10:
Data are transmitted using the remaining dataline after short circuit detection.
Data are transmitted on CANH or CANL after overcurrent was detected.
Transmission is terminated (fail safe).
Data are received on CANH or CANL after detection of permanent dominant state.
Data are received on CANH or CANL after short circuit was detected.
Data are received normally, error is detected by protocol unit.
Upon any error in normal or RXonly mode the NERR output will be forced LOW and released after error recovery.
N
Type of Errors
Severity
RX
TX
Errors caused by damage of the datalines or isolation
1
CANH wire interrupted (floating or tied to termination)
0
0
2
CANL wire interrupted (floating or tied to termination)
0
0
3
CANH short circuit to VS (overvoltage condition)
1
1
4
CANL short circuit to GND (permanently dominant)
2
0
5
CANH short circuit to GND (permanently recessive)
0
2
6
CANL short circuit to VS (overvoltage condition)
1
1
7
CANL shorted to CANH
2
2
Errors caused by misbehaviour of transceiver stage
8
CANH short circuit to VCC (permanently dominant)
2
0
9
CANL short circuit to VCC (permanently recessive)
0
2
Errors caused by defective protocol unit
10
CANH, CANL driven dominant for more than 1.3 ms
2
2
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