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参数资料
| 型号： | MPC8315VRAGDA |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 400 MHz, MICROPROCESSOR, PBGA620 |
| 封装： | 29 X 29 MM, 2.23 MM HEIGHT, 1 MM PITCH, LEAD FREE, TEPBGAII-620 |
| 文件页数： | 11/112页 |
| 文件大小： | 1283K |
| 代理商： | MPC8315VRAGDA |
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MPC8315E PowerQUICC II Pro Processor Hardware Specifications, Rev. 0
108
Freescale Semiconductor
System Design Information
26.4
Connection Recommendations
To ensure reliable operation, it is highly recommended to connect unused inputs to an appropriate signal
level. Unused active low inputs should be tied to NVDD, GVDD, or LVDD as required. Unused active
high inputs should be connected to GND. All NC (no-connect) signals must remain unconnected.
Power and ground connections must be made to all external VDD, GVDD, LVDD, NVDD, and GND pins
of the device.
26.5
Output Buffer DC Impedance
The MPC8315E drivers are characterized over process, voltage, and temperature. 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 NVDD
or GND. Then, the value of each resistor is varied until the pad voltage is NVDD/2 (see Figure 64). 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
NVDD/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 64. 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.
Table 80 summarizes the signal impedance targets. The driver impedance are targeted at minimum VDD,
nominal NVDD, 105
°C.
NVDD
OGND
RP
RN
Pad
Data
SW1
SW2
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