MC68HC12 MOTOROLA [Motorola, Inc], MC68HC12 Datasheet - Page 423

• Manufacturer Part Number: MC68HC12
• Description: The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC912DT128A — Rev 4.0
MOTOROLA
Average junction temperature
Ambient temperature
Package thermal resistance (junction-to-ambient)
Total power dissipation
Device internal power dissipation
I/O pin power dissipation
A constant
1. This is an approximate value, neglecting P
2. For most applications P
3. K is a constant pertaining to the device. Solve for K with a known T
112-pin quad flat pack (QFP)
K to solve for P
(3)
D
Characteristic
and T
(1)
J
I/O
(2)
iteratively for any value of T
« P
INT
and can be neglected.
Table 21-2. Thermal Characteristics
I/O
.
Electrical Specifications
A
.
Symbol
P
P
Θ
P
T
T
INT
K
I/O
JA
A
D
J
A
and a measured P
P
D
× (T
User-determined
User-determined
A
T
P
A
+ 273°C) + Θ
INT
I
+ (P
------------------------- -
T
DD
D
J
Value
+
(at equilibrium). Use this value of
+ P
40
× V
K
273°C
D
× Θ
I/O
DD
or
JA
Electrical Specifications
)
JA
× P
D
Technical Data
Tables of Data
2
W · °C
°C/W
Unit
°C
°C
W
W
W
423