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| 型号： | MPC8358EVRAGDDA |
| 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, RISC PROCESSOR, PBGA668 |
| 封装： | 29 X 29 MM, 1.46 MM HEIGHT, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-668 |
| 文件页数： | 91/95页 |
| 文件大小： | 1225K |
| 代理商： | MPC8358EVRAGDDA |
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MPC8358E PowerQUICC II Pro Processor Revision 2.1 PBGA Silicon Hardware Specifications, Rev. 3
Freescale Semiconductor
91
System Design Information
24.5
Output Buffer DC Impedance
The device 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 OVDD
or GND. Then, the value of each resistor is varied until the pad voltage is OVDD/2 (see Figure 55). 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 55. 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.
nominal OVDD, 105°C.
Table 77. Impedance Characteristics
Impedance
Local Bus, Ethernet, DUART,
Control, Configuration, Power
Management
PCI
DDR DRAM
Symbol
Unit
RN
42 Target
25 Target
20 Target
Z0
W
RP
42 Target
25 Target
20 Target
Z0
W
OVDD
OGND
RP
RN
Pad
Data
SW1
SW2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MPC8358EVRAGDGA | 功能描述:微处理器 - MPU 8358 PBGA ENCRP NO-PB RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MPC8358EVVADDE | 功能描述:微处理器 - MPU 8360 TBGA ENCRP NO-PB RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MPC8358EVVADDEA | 功能描述:微处理器 - MPU 8360 TBGA ENCRP NO-PB RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324 |
| MPC8358EVVADDGA | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:MPC8360E/MPC8358E PowerQUICC II Pro Processor |
| MPC8358EVVAGDEA | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:MPC8360E/MPC8358E PowerQUICC II Pro Processor |
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