MC7447AHX1000NB Freescale Semiconductor, MC7447AHX1000NB Datasheet - Page 49

• Manufacturer Part Number: MC7447AHX1000NB
• Description: IC MPU RISC 1000MHZ 360-FCCBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC7447AHX1000NB

• Processor Type: MPC74xx PowerPC 32-Bit
• Speed: 1.0GHz
• Voltage: 1.1V
• Mounting Type: Surface Mount
• Package / Case: 360-FCCBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

9.8.4
The MPC7447A 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 MPC7447A on-board temperature diode:
Ideality factor is defined as the deviation from the ideal diode equation:
Where:
Another useful equation is :
Where:
Freescale Semiconductor
V
0.40 V <V
Operating range 2–300 μA
Diode leakage < 10 nA @ 125 C
Ideality factor (n) over 5–150 μA @ 60 C: 1.0275 ± 0.9 %
I
I
V
V
q = Charge of electron (1.6 x 10
n = Ideality factor (normally 1.0)
K = Boltzman’s constant (1.38 x 10
T = Temperature (Kelvins)
V
V
I
I
H
fw
s
H
L
d
f
H
L
I
= Smaller diode bias current
= Saturation current
= Larger diode bias current
fw
= Voltage forward biased
– V
= Voltage at diode BM: this does not show up in any equations.
= Forward current
= Diode voltage while I
= Diode voltage while I
= I
Temperature Diode
L
= n
s
f
<0.90 V
KT
__
e
q
___
nKT
qV
MPC7447A RISC Microprocessor Hardware Specifications, Rev. 5
ln
f
__
– 1
I
I
L
H
L
H
is flowing
is flowing
-19
-23
C)
Joules/K)
BE
variation of each MPC7447A’s internal diode.
System Design Information
49