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參數(shù)資料
| 型號： | 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)： | 47/66頁 |
| 文件大小： | 1181K |
| 代理商： | MCZ33989EG |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
47
33989
TYPICAL APPLICATIONS
SUPPLEMENTAL APPLICATION NOTES
TX and RX Pins
The TX pin has an internal pull up to V2. The state of TX
depends on the V2 status. RX is a push-pull structure,
supplied by V2. When V2 is set at 5V, and CAN is in normal
mode, RX reports the bus status. When V2 is off RX is low.
Normal Mode and Slew Rate Selection
The slew rate selection is done via the SPI. Four slew rates
are available. The slew rate affects the recessive to dominant
and dominant to recessive transitions. This affect is also the
delay time from the TX pin to the bus, and from the bus to RX.
The loop time is thus affected by the slew rate selection.
The following figure is an illustration of the slew rate on
CANH, CANL, TX and RX.
Figure 36. Normal Mode and Slew Rate Selection
Minimum Baud Rate
As TX permanent dominant is detected after TDOUT (min
200 μs), a minimum Baud rate is required in order to get good
behavior: once TX permanent dominant is detected the CAN
driver is off.
The maximum number of consecutive dominant bits in a
frame is 12 (6 bits of active error flag and its echo error flag).
200 μs/12 = 16.7 μs. The minimum Baud rate is 1/6.7 μs =
60 KBaud.
Termination
The MC33989 supports the two main types of bus
termination:
Differential termination resistors between CANH and
CANL lines.
Split termination concept, with mid point of the
differential termination connected to gnd through a
capacitor.
Figure 37. Bus Termination
CAN signal with slew rate 0 selected
CAN signal with slew rate 3 selected
R=60 ohms, CL = CH = 100pF
TX
RX
CANH
CANL
RT
Gnd
CAN bus
MC33989
(partial drawing)
TX
RX
CANH
CANL
RT /2
Gnd
CAN bus
MC33989
(partial drawing)
Split termination concept
Differential termination concept
RT /2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCZ33989EG | 制造商:Freescale Semiconductor 功能描述:IC SYSTEM BASIS W/CAN TRANCEIVER |
| MCZ33989EGR2 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC SBC-HS RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| MCZ33990EF | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC CLASS B SERIAL TRANS. RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| MCZ33990EF | 制造商:Freescale Semiconductor 功能描述:TRANCEIVER J-1850 CLASS B 8SOIC |
| MCZ33990EF/R2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Enhanced Class B Serial Transceiver |
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