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参数资料
| 型号： | MC33889 |
| 厂商： | 飞思卡尔半导体(中国)有限公司 |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | System Basis Chip (SBC) with Low Speed Fault Tolerant CAN Interface |
| 中文描述： | 带有低速CAN的精简版系统基础芯片 |
| 文件页数： | 15/30页 |
| 文件大小： | 464K |
| 代理商： | MC33889 |
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PC33889
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PC33889
Figure 5. Reset and Wdogb function diagram
The Wdogb output pin is a push pull structure than can drive external component of the application in order for instance to sig-
nal MCU wrong operation. Even if it is internally turned on (low sate) the reset pins can be forced to 5V at 25°C only, thanks to
its internal limited current drive capability. Wdogb stays low until the Watchdog register is properly addressed through SPI.
4.16
Debug mode Application hardware and software debug with the SBC.
When the SBC is mounted on the same printed circuit board as the micro controller it supplies, both application software and
SBC dedicated routine must be debugged. Following features allow the user to debug the software by allowing the possibility to
disable the SBC internal software watchdog timer.
4.16.1
Device power up, reset pin connected to Vdd1
At SBC power up, the Vdd1 voltage is provided, but if no SPI communication occurs to configure the device, a reset occurs
every 350ms. In order to allow software debug and avoid MCU reset the Reset pin can be connected directly to Vdd1 by a jumper.
4.16.2
Debug modes with software watchdog disabled though SPI (Normal Debug, Standby Debug and Stop Debug)
The software watchdog can be disabled through SPI. In order to avoid unwanted watchdog disable and to limit the risk of
disabling the watchdog during SBC normal operation the watchdog disable has to be done with the following sequence:
Step 1) Power down the SBC
Step 2) Power up the SBC (The BATFAIL bit is set, and the SBC enters normal request mode)
Step 3) Write to TIM1 register to allow SBC to enter Normal mode
Step 4) Write to MCR register with data 0000 (this enables the debug mode). (Complete SPI byte: 000 1 0000)
Step 5) Write to MCR register normal debug (0001 x101), standby debug (0001 x110) or Stop debug (0001 x111)
While in debug mode, the SBC can be used without having to clear the W/D on a regular basis to facilitate software and
hardware debug.
Step 6) To leave the debug mode, write 0000 to MCR register.
To avoid entering debug mode after a power up, first read BATFAIL bit (MCR read) and write 0000 into MCR.
The graph below illustrates the debug mode entering.
Figure 6. Debug mode enter
4.16.3
MCU flash programming configuration
In order to allow the possibility to download software into the application memory (MCU EEPROM or Flash) the SBC allows
the following capabilities: The Vdd1 can be forced by an external power supply to 5V and the reset and Wdogb outputs by
For More Information On This Product,
Go to: www.freescale.com
Reset
WDOGB
Vdd1
SPI
SPI CSB
Watchdog time out
Watchdog register addressed
Watchdog
period
W/D clear
VSup
SPI
MCR(step4)
Batfail
Vdd1
debug mode
MCR (step5)
SPI: read batfail
MCR (step6)
SBC in debug Mode, no W/D
SBC not in debug Mode and W/D on
TIM1(step 3)
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Freescale Semiconductor, Inc.
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相关代理商/技术参数 |
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|---|---|
| MC33889BDW | 功能描述:网络控制器与处理器 IC SBC LIGHT PASS 3.3 RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MC33889BDWR2 | 功能描述:网络控制器与处理器 IC SBC LIGHT PASS 3.3 RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MC33889BPEG | 制造商:Freescale Semiconductor 功能描述:SYSTEM BASIS CHIP WITH LOW SPEED FAULT TOLERANT CAN INTERFACE 制造商:Freescale Semiconductor 功能描述:SBC-LITE-LS-CAN - Bulk 制造商:Freescale Semiconductor 功能描述:IC SYSTEM BASIS W/CAN 28SOIC |
| MC33889BPEGR2 | 制造商:Freescale Semiconductor 功能描述:CAN 125Kbps Sleep/Stop 9V/12V/15V T/R 制造商:Freescale Semiconductor 功能描述:SBC-LITE-LS-CAN - Tape and Reel 制造商:Freescale Semiconductor 功能描述:IC SYSTEM BASIS W/CAN 28SOIC |
| MC33889DDW | 功能描述:网络控制器与处理器 IC SBC LIGHT REV D RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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