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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CAN收發(fā)器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大小： | 205K |
| 代理商： | L9669 |
L9669
10/13
1.4 Diagnosis
A serial interface is available to retrieve diagnostic informations. Diagnostic data can be requested by using EN
as serial clock and evaluating NERR.
Figure 4.
Readout is initialized by a negative edge on EN and acknowledged by NERR entering HIGH state. Following
the next negative edge the first error status bit is displayed on NERR according to the data table below. If no
edge on EN is detected for a time longer than t
Dmax
diagnosis is disabled and operation continuous in the mode
given by NSTB and EN with NERR showing bus errors or wake-up correspondingly. If the clock continues, the
readout sequence starts over again with the initial bit set HIGH.
The following errors are displayable (sequence listed in chronological order):
– error status bit 1 (LSB):
HIGH if Error 1 or 5
– error status bit 2:
HIGH if Error 2 or 9
– error status bit 3:
HIGH if Error 3
– error status bit 4:
HIGH if Error 4
– error status bit 5:
HIGH if Error 6
– error status bit 6:
HIGH if Error 8
– error status bit 7:
HIGH if Error 10
– error status bit 8:
HIGH if Thermal shutdown of Transceiver
1.5 Protections
A current limiting circuit protects the transmitter outputs against short-circuit to battery, ground and shorted
wires.
If the junction temperature exceeds a maximum value, the transmitter output stages are disabled.
99AT0004
E1
or E5
E2
or E9
E3
E4
EN
NERR
Mode
(Example)
NSTB
Bus Error
detected
Normal
RXonly
Standby
No Bus Errors
Delay between falling slope at EN and reaction at NERR: 0.7
(NERR is synchronized with internal clock).
μ
s...3.0
μ
s
t
Dmax
Diagnosis
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