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參數(shù)資料
| 型號： | intel Pentium II processor |
| 廠商： | Intel Corp. |
| 英文描述： | Pentium II Processor Mobile Module(帶移動模塊奔II處理器) |
| 中文描述： | 奔騰II處理器的移動模塊（帶移動模塊奔二處理器） |
| 文件頁數(shù)： | 34/46頁 |
| 文件大?。?/td> | 681K |
| 代理商： | INTEL PENTIUM II PROCESSOR |
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34
INTEL
PENTIUM
II PROCESSOR MOBILE MODULE MMC-1
With the circuit shown in Figure 8, t_delay = 5.53 ms, t_tran
= 14.0 ms and I_max = 146 mA. Figure 9 shows a SPICE
simulation of the circuit in Figure 8. To increase the reliability
of Tantalum capacitors, use a slew rate control circuit as
described in Figure 8 and voltage-derate the capacitor about
50 percent. That is, for a maximum input voltage of 18V, use
a 35V, low ESR capacitor with high ripple current capability.
Place five, 22 μF/35V capacitors on the baseboard directly at
the V_DC pins of the Pentium
II processor MMC-1.
The slew rate control circuit should also be applied to every
input power source to the system V_DC to provide the most
protection. If all power is OR’ed together at the PWR node,
there is still a potential problem. For example, if a 3X3 Li-Ion
battery pack is powering the system (12V at PWR), and the
AC Adaptor (18V) is plugged into the system, current will
immediately be sourced to the PWR node and V_DC. This is
because the slew rate control is already ON. Therefore, the
slew rate control must be applied to every input power
source to provide the most protection.
.
Figure 9. Spice Simulation Using In-Rush Protection (Example Only)
4.7.4.2.
Under-Voltage Lockout: Circuit Description
(V_uv_lockout)
The circuit shown in Figure 8 provides an under-voltage
protection and locks out the applied voltage to the Pentium
II processor mobile module to prevent an accidental turn-on
at low voltage. The output of this circuit, pin 1 of the LM339
comparator, is an open-collector output. It is low when the
applied voltage at PWR is less than 4.75V. This voltage can
be calculated with the following equation with the voltage
across D7 as 2.5V. (D7 is a 2.5-V reference generator).
V_uv_lockout
Vre.
R17
R1.
R18
R25
=
V_uv_lockout
4.757 volt
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