SUPPLEMENTAL APPLICATION NOTES Table 36. Current i" />
參數(shù)資料
型號(hào)： MC33989DWR2
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 53/72頁(yè)
文件大?。?/td> 0K
描述： IC SYSTEM BASE W/CAN 28-SOIC
標(biāo)準(zhǔn)包裝： 1
控制器類型： 系統(tǒng)基礎(chǔ)芯片
接口： CAN
電源電壓： 5.5 V ~ 18 V
電流 - 電源： 45mA
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 剪切帶 (CT)
配用： KIT33989DWEVB-ND - KIT EVAL 33989DW HS SBC
其它名稱： MC33989DWR2CT
Analog Integrated Circuit Device Data
Freescale Semiconductor
57
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
Table 36. 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 1.0 MB) 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
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 5.0 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 5.0 V
0
-150
no communication (34)
CANL line to VBAT
0
-240
no communication (34)
CANH line shorted to
CANL line
0
70
-70
no communication (34)
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