OPERATIONAL MODES The following figure illu" />
參數(shù)資料
型號(hào): MC33889DEG
廠商: Freescale Semiconductor
文件頁數(shù): 28/59頁
文件大?。?/td> 0K
描述: IC SYSTEM BASE W/CAN 28-SOIC
標(biāo)準(zhǔn)包裝: 24
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: 管件
Analog Integrated Circuit Device Data
34
Freescale Semiconductor
33889
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
The following figure illustrates the CAN signal during normal communication and in the example of a CANH open wire. The
single ended receiver is sampled at the differential receiver switching event, in a window of 1.0
s.
Figure 14. CAN Normal Signal Communication and CAN Open Wire
Figure 15. Open Wire Detection Principle
Open wire detection, MC33889B and D:
Failure detection:
The device will detect a difference in toggling counts between the differential receiver and one of the single ended receivers.
Every time a difference in count is detected a counter is incremented. When the counter reaches 4, the device detects and reports
an open wire condition. The open wire detection is performed only when the device receives a message and not when it send
message.
Open wire recovery:
When the open wire failure has recovered, the difference in count is reduced and the device detects the open wire recovery.
CANH
CANL
Diff
S-L
S-H
-3.2V
Rec
Dom
Rec
Sampling point
CANH
CANL
Diff
S-L
S-H
-3.2V
Rec
Dom
Rec
Sampling point
Sampling recessive level
= > open wire “detection pulse”
1us
(No open wire, or open wire recovery)
(CAN H open wire)
Sampling dominant level
= > no failure or “recovery pulse”
Diff
CANH
CANL
S-H
1us
Sampling
Dom Rec
S-L
1us
Sampling
CANH counter
L-open
L-counter +/-
(count = 4)
recover
(count = 0)
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