mpc8641 Freescale Semiconductor, Inc, mpc8641 Datasheet - Page 115

• Manufacturer Part Number: mpc8641
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: Freescale Semiconductor, Inc

19.2.4
The MPC8641 has a temperature diode on the microprocessor that can be used in conjunction with other
system temperature monitoring devices (such as Analog Devices, ADT7461™). These devices use the
negative temperature coefficient of a diode operated at a constant current to determine the temperature of
the microprocessor and its environment. For proper operation, the monitoring device used should
auto-calibrate the device by canceling out the V
The following are the specifications of the MPC8641 on-board temperature diode:
V
V
Operating range 2–300 μA
Diode leakage < 10 nA @ 125°C
Ideality factor over 5–150 μA at 60°C: n = 1.0275
Freescale Semiconductor
f
f
> 0.40 V
< 0.90 V
Temperature Diode
Conductivity
MPC8641 and MPC8641D Integrated Host Processor Hardware Specifications, Rev. 2
Bump and Underfill (12.4 × 15.3 × 0.07 mm)
Silicon
k
k
k
k
k
k
k
z
x
y
z
x
y
z
C5 Solder layer (33 × 33 × 0.4 mm)
Substrate (33 × 33 × 1.2 mm)
Die (12.4x15.3x0.86 mm)
Collapsed Resistance
Figure 62. Recommended Thermal Model of MPC8641
Temperature
dependent
Value
0.034
0.034
13.5
13.5
5.3
5.3
9.6
BE
W/(m • K)
W/(m • K)
W/(m • K)
±
variation of each MPC8641’s internal diode.
Unit
0.9%
y
z
Side View of Model (Not to Scale)
Top View of Model (Not to Scale)
x
Bump and Underfill
C5 solder layer
Substrate
Substrate
Die
Die
Thermal
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