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VSC7440 bảng dữ liệu(PDF) 442 Page - Microsemi Corporation

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Design Guidelines
VMDS-10492 VSC7440 Datasheet Revision 4.2
425
•
Place the external temperature monitor as close as is possible to this device.
•
Add a 47
Ω resistor in series with the external temperature monitor supply to filter noise.
•
When using a grounded sensor circuit, place a de-coupling capacitor between the external
temperature monitor supply pin and the THERMDC signal. For more information about using a
grounded sensor circuit, see Figure 133, page 376.
Place the capacitor close to the external temperature sensor, as shown in the following illustration.
Connect the external temperature monitor VSS pin directly to the THERMDC pin, which has the
connection to VSS, as shown in the following illustration. Do not connect the external temperature
monitor VSS pin to the global VSS plane.
Figure 156 •
External Temperature Monitor Connection
Supply
External
Temperature
Monitor
Sense
Switch
VDD
VSS
VSS
VSS
THERMDA
THERMDC
Data Bus



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