參數(shù)資料
型號(hào): MCZ33989EG
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
中文描述: 系統(tǒng)基礎(chǔ)芯片高高速CAN收發(fā)器
文件頁數(shù): 53/66頁
文件大小: 1181K
代理商: MCZ33989EG
Analog Integrated Circuit Device Data
Freescale Semiconductor
53
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
Table 35. Current in Case of Bus Short Conditions
Notes
34.
For the failure case which leads to loss of communication and current flow for a very short time period as illustrated in
Figure 45
. So for
instance for CANH to gnd, the impact of the peak current on the V2 voltage regulator is very limited. The TX, RX, and CAN signal in the
figure are placed in a CANH to CANL short circuit condition.
Figure 45. CANH to CANL Short Circuit Condition
The sender node drives TX and the CAN bus, but doesn’t
receive anything on RX, so the CAN protocol handler inside
the MCU increases its TEC transmit error counter by 8.The
sender node keeps driving TX in dominant until it reaches the
error passive level (TEC=128).
When it is in error passive, it sends a passive error frame
(23 bits in recessive). Then the sender nodes drive the bus
and send only 1 dominant bit, and as nothing is received on
RX, the TEC is incremental by 8. After TX is driven 15 times,
the TEC reaches 255: then the node is in the BUS OFF state.
When the node is in the BUS OFF state, it needs 128
occurrences of 11 recessive bits (1.408 ms at 1MBauds) in
order to recover and be able to transmit again.
Condition
I term
current
I_H
current
I-L
current
Comment
peak current (mA)
No failure
32
0
0
Normal communication.
CANH line to gnd
0
150
0
No communication. Current flowing from V2 pin, during CAN driver dominant
state.
(34)
CANH line to 5 V
55
-55
0
communication OK.
CANH line to +VBAT
150
-150
0
communication OK.
CANL line to gnd
50
0
50
communication OK.
CANL line to 5 V
0
0
-150
no communication
(34)
CANL line to VBAT
0
0
-240
no communication
(34)
CANH line shorted to
CANL line
0
70
-70
no communication
(34)
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