fw = Forward current I
參數(shù)資料
型號(hào)： PCX7447AVGH1000NB
廠商： Atmel
文件頁(yè)數(shù)： 9/52頁(yè)
文件大小： 0K
描述： IC MPU 32BIT 1000MHZ 360CBGA
標(biāo)準(zhǔn)包裝： 44
處理器類(lèi)型： PowerPC 32-位 RISC
速度： 1.0GHz
電壓： 1.1V
安裝類(lèi)型： 表面貼裝
封裝/外殼： 360-CBBGA 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 360-CBGA（25x25）
包裝： 托盤(pán)
17
0833E–HIREL–01/07
e2v semiconductors SAS 2007
PC7447A
Where:
I
fw = Forward current
I
s = Saturation current
V
d = Voltage at diode
V
f = Voltage forward biased
V
H = Diode voltage while IH is flowing
V
L = Diode voltage while IL is flowing
I
H = Larger diode bias current
I
L = 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 I
H to IL is usually selected to be 10:1. The above simplifies to the following:
V
H - VL = 1.986 × 10
-4 × nT
Solving for T, the equation becomes:
6.4.4.3
Dynamic Frequency Switching (DFS)
The new DFS feature in the PC7447A adds the ability to divide the processor-to-system bus ratio by two
during normal functional operation by setting the HID1[DFS1] bit. The frequency change occurs in 1
clock cycle, and no idle waiting period is required to switch between modes. Additional information
regarding DFS can be found in the MPC7450 RISC Microprocessor Family User’s Manual.
6.4.4.4
Power Consumption with DFS Enabled
Power consumption with DFS enabled can be approximated using the following formula:
Where:
P
DFS = Power consumption with DFS enabled
f
DFS = Core frequency with DFS enabled
f = Core frequency prior to enabling DFS
P = Power consumption prior to enabling DFS (see Table 6-6 on page 19)
P
DS = Deep sleep mode power consumption (see Table 6-6 on page 19)
The above is an approximation only. Power consumption with DFS enabled is not tested or guaranteed.
nT
V
H
V
–
L
1 986
10
4
–
×
,
---------------------------------
=
P
DFS
f
DFS
f
----------- PP
DS
–
()
P
DS
+
=
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PCX7447AVGH1167NB 功能描述:IC MPU 32BIT 1167MHZ 360CBGA RoHS:否 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微處理器 系列:- 標(biāo)準(zhǔn)包裝:60 系列:SCC 處理器類(lèi)型:Z380 特點(diǎn):全靜電 Z380 CPU 速度:20MHz 電壓:5V 安裝類(lèi)型:表面貼裝 封裝/外殼:144-LQFP 供應(yīng)商設(shè)備封裝:144-LQFP 包裝:托盤(pán)
PCX7448MGH1000NC 制造商:e2v technologies 功能描述:MPU RISC 32BIT 0.09UM 1GHZ 1.5V/1.8V/2.5V 360HITCE CBGA - Trays
PCX7448MGH1250NC 制造商:e2v technologies 功能描述:PCX7448MGH1250NC - Trays
PCX7448VGH1000NC 制造商:e2v technologies 功能描述:PCX7448VGH1000NC - Trays
PCX7448VGH1250NC 制造商:e2v technologies 功能描述:MPU RISC 32BIT 0.09UM 1.25GHZ 1.5V/1.8V/2.5V 360HITCE CBGA - Trays
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