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| MC68HC912BD32 Datasheet, PDF (260/292 Pages) Freescale Semiconductor, Inc – Advance Information | |||
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Freescale Semiconductor, Inc.
Preliminary Electrical Characteristics
Table 66 Thermal Characteristics
Characteristic
Symbol
Value
Unit
Average junction temperature
Ambient temperature
Package thermal resistance (junction-to-ambient)
80-pin quad ï¬at pack (QFP)
TJ
TA + (PD Ã ÎJA)
°C
TA
User-determined
°C
ÎJA
85
°C/W
Total power dissipation(1)
PINT + PI/O
or
PD
W
-T---J---+-----K2---7---3---°--C--
Device internal power dissipation
I/O pin power dissipation(2)
A constant(3)
PINT
PI/O
K
IDD Ã VDD
User-determined
PD
Ã
(TA
ÎJA
+
Ã
273°C)
PD2
+
W
W
W · °C
1. This is an approximate value, neglecting PI/O.
2. For most applications PI/O « PINT and can be neglected.
3. K is a constant pertaining to the device. Solve for K with a known TA and a measured PD (at equilibrium). Use this value
of K to solve for PD and TJ iteratively for any value of TA.
MC68HC912BD32 Rev 1.0
Preliminary Electrical Characteristics
For More Information On This Product,
Go to: www.freescale.com
2-elec
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