MIC281-7BM6 TR【PDF 12/14 页】IC SUPERVISOR THERMAL SOT23-6

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icrel, Inc.

MIC281

pril 23, 2014

Revision 2.0

Layout Considerations

The following guidelines should be kept in mind when

designing and laying out circuits using the MIC281.

1. Place the MIC281 as close to the remote diode as

possible, while taking care to avoid severe noise

sources such as high frequency power transformers,

CRTs, memory and data busses, and the like.

2. Because any conductance from the various voltages

on the PC board and the T1 line can induce serious

errors, it is good practice to guard the remote diode's

emitter trace with a pair of ground traces. These

ground traces should be returned to the MIC281's own

ground pin. They should not be grounded at any other

part of their run. However, it is highly desirable to use

these guard traces to carry the diode's own ground

return back to the ground pin of the MIC281, thereby

providing a Kelvin connection for the base of the

diode. See Figure 3.

3. When using the MIC281 to sense the temperature of a

processor or other device which has an integral

thermal diode, e.g., Intel's Pentium III, connect the

emitter and base of the remote sensor to the MIC281

using the guard traces and Kelvin return shown in

Figure 3. The collector of the remote diode is typically

inaccessible to the user on these devices.

4. Due to the small currents involved in the measurement

of the remote diodes V

, it is important to

adequately clean the PC board after soldering to

prevent current leakage. This is most likely to show up

as an issue in situations where water-soluble soldering

uxes are used.

5. In general, wider traces for the ground and T1 lines will

help reduce susceptibility to radiated noise (wider

traces are less inductive). Use trace widths and

spacing of 10mm wherever possible and provide a

ground plane under the MIC281 and under the

connections from the MIC281 to the remote diode.

This will help guard against stray noise pickup.

6. Always place a good quality power supply bypass

capacitor directly adjacent to, or underneath, the

MIC281. This should be a 0.1礔 ceramic capacitor.

Surface-mount parts provide the best bypassing

because of their low inductance.

Figure 3. Guard Traces/Kelvin Ground Returns

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