參數(shù)資料
型號(hào)： 440GRX
廠商： Applied Micro Circuits Corp.
英文描述： PowerPC 440GRx Embedded Processor
中文描述： 嵌入式處理器的PowerPC 440GRx
文件頁(yè)數(shù)： 68/88頁(yè)
文件大?。?/td> 603K
代理商： 440GRX
440GRx – PPC440GRx Embedded Processor
Preliminary Data Sheet
70
AMCC Proprietary
Revision 1.08 – October 15, 2007
Thermal Monitor
Thermal monitoring of the chip is accomplished using the PNP transistor (
β ≈ 2) provided on the chip. The collector
of the transistor is connected to ground (GND). The emitter (TherMonA) and base (TherMonB) are connected to
chip pins. A voltage measurement (VBE1 and VBE2) across the TherMonA and TherMonB pins at the two current
values I1 and I2 provides the chip temperature in °K according to the equation:
T = (q/nk)(VBE2VBE1)/ln(I2/I1) °K
where q = 1.602 176 53×10-19, n = 1.0 ± 0.015, and k = 1.380 6505×10
-23.
Note: VBE2 and VBE1 should be specified in Volts. I1 and I2 can be any units of measure provided they are the
same. The small values require precision measurement and current sources.
Test Conditions
Clock timing and switching characteristics are specified in accordance with operating
conditions shown in the table Table 11 on page 64. AC specifications are characterized
with VDD =+1.5V, TC = +85 °C and a 50pF test load as shown in the figure to the right.
TherMonA
TherMonB
PPC440GRx
I1, I2 (Max = 300μA)
E
B
VBE1, VBE2
Note: The bias voltage VEB should be between +0.5V and +0.7V.
C
Output
Pin
50pF
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