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參數(shù)資料
| 型號： | MPC8309CVMAHFCA |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 417 MHz, RISC PROCESSOR, PBGA489 |
| 封裝： | 19 X 19 MM, 1.61 MM HEIGHT, 0.80 MM PITCH, LEAD FREE, PLASTIC, MAPBGA-489 |
| 文件頁數(shù)： | 75/81頁 |
| 文件大?。?/td> | 484K |
| 代理商： | MPC8309CVMAHFCA |
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MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 1
Freescale Semiconductor
77
System Design Information
to minimize inductance. Suggested bulk capacitors—100 to 330 F (AVX TPS tantalum or Sanyo
OSCON).
25.4
Output Buffer DC Impedance
For all buses, the driver is a push-pull single-ended driver type (open drain for I2C).
To measure Z0 for the single-ended drivers, an external resistor is connected from the chip pad to OVDD
or GND. Then, the value of each resistor is varied until the pad voltage is OVDD/2 (see Figure 47). The
output impedance is the average of two components, the resistances of the pull-up and pull-down devices.
When data is held high, SW1 is closed (SW2 is open) and RP is trimmed until the voltage at the pad equals
OVDD/2. RP then becomes the resistance of the pull-up devices. RP and RN are designed to be close to each
other in value. Then, Z0 =(RP +RN)/2.
Figure 47. Driver Impedance Measurement
The value of this resistance and the strength of the driver’s current source can be found by making two
measurements. First, the output voltage is measured while driving logic 1 without an external differential
termination resistor. The measured voltage is V1 = Rsource Isource. Second, the output voltage is measured
while driving logic 1 with an external precision differential termination resistor of value Rterm. The
measured voltage is V2 =(1/(1/R1 +1/R2)) Isource. Solving for the output impedance gives
Rsource =Rterm (V1/V2 – 1). The drive current is then Isource =V1/Rsource.
OVDD
OGND
RP
RN
Pad
Data
SW1
SW2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MPC8309EC | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications |
| MPC8309-KIT | 功能描述:開發(fā)板和工具包 - 其他處理器 For MPC8309 Ethernet USB I2C SPI RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
| MPC8309-KIT | 制造商:Freescale Semiconductor 功能描述:MPC830x Processor Evaluation Kit |
| MPC8309-SOM | 功能描述:開發(fā)板和工具包 - 其他處理器 For MPC8309 Ethernet USB 16bit 32bit RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
| MPC8309VMADDC | 制造商:Freescale Semiconductor 功能描述:MPC8309VMADDC - Bulk |
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