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MC912D60AVPVE8 Datasheet, PDF (407/460 Pages) Freescale Semiconductor, Inc – HC12 Microcontrollers | |||
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Electrical Specifications
Tables of Data
Table 20-2. Thermal Characteristics
Characteristic
Symbol
Value
Unit
Average junction temperature
TJ
Ambient temperature
TA
Package thermal resistance (junction-to-ambient)
80-pin quad flat pack (QFP)
ÎJA
TA + (PD Ã ÎJA)
User-determined
50
°C
°C
°C/W
Package thermal resistance (junction-to-ambient)
112-pin thin quad flat pack (TQFP)
ÎJA
51
°C/W
Total power dissipation(1)
Device internal power dissipation
I/O pin power dissipation(2)
PD
PINT
PI/O
PINT + PI/O or
-T---J---+-----K2---7---3---°--C--
W
IDD Ã VDD
W
User-determined
W
A constant(3)
K
PD à (TA + 273°C) +
ÎJA Ã PD2
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.
MC68HC912D60A â Rev. 3.1
Freescale Semiconductor
Electrical Specifications
Technical Data
407
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