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| 型號： | Pentium II 333 |
| 廠商： | Intel Corp. |
| 英文描述： | Processor with On-Die Cache Low-Power Module(帶片上緩存低能量模塊的處理器) |
| 中文描述： | 而對整個處理器模高速緩存低功率模塊（帶片上緩存低能量模塊的處理器） |
| 文件頁數(shù)： | 40/50頁 |
| 文件大小： | 1123K |
| 代理商： | PENTIUM II 333 |
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Pentium
II
Processor with On-Die Cache – Low-Power Module
40
Datasheet
4.7.4.2
Undervoltage Lockout: Circuit Description (V_uv_lockout)
The circuit shown in Figure 8 provides an undervoltage protection and locks out the applied
voltage to the 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 4.75 V. This voltage can be calculated with the following equation with the voltage
across D7 as 2.5 V (D7 is a 2.5-V reference generator).
4.7.4.3
Overvoltage Lockout: Circuit Description (V_ov_lockout)
The module operates with a maximum input voltage of 21 V. This circuit locks out the input
voltage if it exceeds the maximum 21 V. The output of this circuit, Pin 14 of the LM339
comparator, is an open-collector output. It is low when the applied voltage at PWR is more than
21 V. This voltage can be calculated with the following equation:
4.7.4.4
Overcurrent Protection: Circuit Description
Figure 8 shows that the circuit detects an overcurrent condition and cuts off the input voltage
applied to the module. This circuit has two different current limit trip points, which accounts for
the different maximum current drain by the module at different input voltages. Assuming the AC
Adaptor is 18.0 V and the battery is a 3x3 Li-Ion configuration with a minimum voltage of 7.5 V,
the maximum current for the above circuit can be calculated using the following expression:
With AC Adaptor (I_wAdaptor):
I_wAdaptor = 0.989
amp
Without AC Adaptor (I_woAdaptor):
I_woAdaptor = 2.375
amp
V_uv_lockout
Vre.
R17
R1.
R18
R25
=
V_uv_lockout
4.757 volt
V_ov_lockout
.
.
Vref
R26
R26
R27
1
R24
R23
=
V_ov_lockout
20.998 volt
I_wAdaptor
.
Vref
Vbe_Q1
R14
R13
R1
I_woAdaptor
.
Vref
Vbe_Q1
R1.
R14
R33
R13
R1
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