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NCT65
Remote Sensing Diode
The NCT65 is designed to work with substrate transistors
built into processors or with discrete transistors. Substrate
transistors are generally PNP types with the collector
connected to the substrate. Discrete types are either PNP or
NPN transistors connected as diodes (base-shorted to
collector). If an NPN transistor is used, the collector and
capacitor across D+ and D ? close to the NCT65. This
capacitance can effect the temperature measurement, so
ensure that any capacitance seen at D+ and D ? is, at
maximum, 1,000 pF. This maximum value includes the
filter capacitance, plus any cable or stray capacitance
between the pins and the sensor diode.
base are connected to D+ and the emitter to D ? . If a PNP
transistor is used, the collector and base are connected to D ?
and the emitter to D+.
Layout Considerations
Digital boards can be electrically noisy environments, and
the NCT65 is measuring very small voltages from the
remote sensor, so care must be taken to minimize noise
induced at the sensor inputs. Take the following precautions:
GND
D+
D ?
GND
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
? Place the NCT65 as close as possible to the remote
sensing diode. Provided that the worst noise sources,
that is, clock generators, data/address busses etc., are
avoided, this distance can be 4 to 8 inches.
? Route the D+ and D ? tracks close together, in parallel,
with grounded guard tracks on each side. To minimize
inductance and reduce noise pickup, a 5 mil track width
and spacing is recommended. Provide a ground plane
under the tracks, if possible.
? Place a 0.1 m F bypass capacitor close to the V DD pin. In
extremely noisy environments, place an input filter
V DD
1
Figure 4. Typical Arrangement of Signal Tracks
Application Circuit
The figure below shows a typical application circuit for
the NCT65, using an embedded transistor on a GPU to
measure the temperature. The THERM1 p in can be used to
alert the system and throttle the GPU. The THERM2 pin can
be used to shutdown the system if necessary. Both pins
require pullup resistors to V DD or an alternative supply (up
to 3.6 V).
V+ (up to 3.6 V)
NCT65
T_TRIP = 85 ? C
10 k W
REFERENCE
+
COMPARATOR
4
THERM2
?
GPU
D+
D ?
2
3
LOW
PASS
FILTER
DIFFERENCE
AMPLIFIER
10 k W
REFERENCE
?
COMPARATOR
+
T_TRIP = 70 ? C
6
THERM1
5
7
8
GND
Figure 5. Typical Configuration Block Diagram
http://onsemi.com
5
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