参数资料
型号: MPC8544EAVTALFA
厂商: Freescale Semiconductor
文件页数: 8/117页
文件大小: 0K
描述: IC MPU POWERQUICC III 783-FCBGA
标准包装: 36
系列: MPC85xx
处理器类型: 32-位 MPC85xx PowerQUICC III
速度: 667MHz
电压: 0.95 V ~ 1.05 V
安装类型: 表面贴装
封装/外壳: 783-BBGA,FCBGA
供应商设备封装: 783-FCPBGA(29x29)
包装: 托盘
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 6
Freescale Semiconductor
105
System Design Information
where:
Ifw = Forward current
Is = Saturation current
Vd = Voltage at diode
Vf = Voltage forward biased
VH = Diode voltage while IH is flowing
VL = Diode voltage while IL is flowing
IH = Larger diode bias current
IL = Smaller diode bias current
q = Charge of electron (1.6
× 10 –19 C)
n = Ideality factor (normally 1.0)
K = Boltzman’s constant (1.38
× 10–23 Joules/K)
T = Temperature (Kelvins)
The ratio of IH to IL is usually selected to be 10:1. The above simplifies to the following:
VH – VL = 1.986 × 10
–4
× nT
Solving for T, the equation becomes:
21 System Design Information
This section provides electrical and thermal design recommendations for successful application of the
MPC8544E.
21.1
System Clocking
This device includes six PLLs:
The platform PLL generates the platform clock from the externally supplied SYSCLK input. The
frequency ratio between the platform and SYSCLK is selected using the platform PLL ratio
configuration bits as described in Section 19.2, “CCB/SYSCLK PLL Ratio.
The e500 core PLL generates the core clock as a slave to the platform clock. The frequency ratio
between the e500 core clock and the platform clock is selected using the e500 PLL ratio
configuration bits as described in Section 19.3, “e500 Core PLL Ratio.
The PCI PLL generates the clocking for the PCI bus.
The local bus PLL generates the clock for the local bus.
There are two PLLs for the SerDes block.
VH – VL
1.986
× 10–4
nT =
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