參數(shù)資料
型號(hào)： MIC184BM
廠商： MICREL INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： Local/Remote Thermal Supervisor Advance Information
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO8
封裝： SOIC-8
文件頁(yè)數(shù)： 17/21頁(yè)
文件大?。?/td> 140K
代理商： MIC184BM
November 2000
17
MIC184
MIC184
Micrel
from the MIC184. A good rule of thumb is this: for each ohm
in series with the external transistor, there will be a 0.9
°
C error
in the MIC184's temperature measurement. It is not difficult
to keep the series resistance well below an ohm (typically
0.1
), so in most systems this will not be an issue.
Filter Capacitor Selection
When using a remote diode for temperature sensing, it is
sometimes desirable to use a filter capacitor between the A2/
T1 and GND pins of the MIC184. The use of this capacitor is
recommended in environments with a significant high fre-
quency noise (such as digital switching noise), or if long wires
are used to connect to the remote diode. The maximum
recommended total capacitance from the A2/T1 pin to GND
is 2700pF. This usually suggests the use of a 2200pF NP0 or
C0G ceramic capacitor with a 10% tolerance.
If the remote diode is to be at a distance of more than 6" ~ 12"
from the MIC184, using a shielded cable (solid foil shield
microphone cable is a good choice) for the connections to the
diode can significantly help reduce noise pickup. Remember
to subtract the cable's conductor-to-shield capacitance from
the 2700pF maximum total capacitance.
Layout Considerations
Local Mode Only Applications:
If the MIC184 is not going to be used with an external diode,
the best layout is one which keeps it thermally coupled to the
subsystem(s) whose temperature it must monitor, while
avoiding any strong sources of EMI, RFI, or electrostatically
coupled noise. Two of the most common examples of such
sources are switching power supply transformers and CRTs.
Remote Mode Applications:
1. If the remote sensing capability of the MIC184
will be used in an application, place the MIC184
as close to the remote diode as possible, while
taking care to avoid severe noise sources (high
frequency power transformers, CRTs, memory
and data busses, and the like).
2. Since any conductance from the various volt-
ages on the PC Board and the A2/T1 pin 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 MIC184
’
s own ground
pin. They should notbe grounded at any other
part of their run. However, it ishighly desirable
to use these guard traces to carry the diode
’
s
own ground return back to the ground pin of the
MIC184, thereby providing a Kelvin connection
for the base of the diode. See Figure 8.
3. When using the MIC184 to sense the tempera-
ture of a processor or other device which has an
integral on-board
“
diode
”
(e.g., Intel
’
s Pentium
III), connect the emitter and base of the remote
sensor to the MIC184 using the guard traces
and Kelvin return shown in Figure 8. The
collector of the remote
“
diode
”
is inaccessible to
the user on these types of chips. To allow for
this, the MIC184 has superb rejection of noise
appearing from collector to GND, as long as the
base to ground connection is relatively quiet.
4. Due to the small currents involved in the mea-
surement of the remote diode
’
s
V
BE
, it is
important to adequately clean the PC board after
soldering. This is most likely to show up as an
issue in some situations where water-soluble
soldering fluxes are used.
5. In general, wider traces for the ground and A2/
T1 pins will help reduce susceptibility to radiated
noise (wider traces are less inductive). Use
trace widths and spacing of 10 mils wherever
possible. Wherever possible, place a ground
plane under the MIC184, and under the connec-
tions from the MIC184 to the remote diode. This
will help guard against stray noise pickup.
6. Always place a good quality V
DD
bypass capaci-
tor directly adjacent to, or underneath, the
MIC184. This part should be a 0.1
μ
F ceramic
capacitor. Surface-mount parts provide the best
bypassing because of their low inductance.
7. When the MIC184 is being powered from
particularly noisy power supplies, or from
supplies which may have sudden high-amplitude
spikes appearing on them, it can be helpful to
add additional power supply filtering. This
should be implemented as a 100
resistor in
series with the part
’
s V
DD
pin, and a 4.7
μ
F, 6.3V
electrolytic capacitor from V
DD
to GND. See
Figure 9.
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