参数资料
型号: MC68HC05C8AMFB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQFP44
封装: QFP-44
文件页数: 102/116页
文件大小: 781K
代理商: MC68HC05C8AMFB
Electrical Specifications
MC68HC05C8A MC68HCL05C8A MC68HSC05C8A Data Sheet, Rev. 5.1
86
Freescale Semiconductor
13.4 Thermal Characteristics
13.5 Power Considerations
The average chip-junction temperature, TJ, in °C, can be obtained from:
TJ = TA + (PD × θJA)
(1)
where:
TA = Ambient temperature, °C
θJA = Package thermal resistance, junction to ambient, °C/W.
PD = PINT + PI/O
PINT = IDD × VDD watts (chip internal power)
PI/O = Power dissipation on input and output pins (user-determined)
For most applications PI/O PINT and can be neglected.
Following is an approximate relationship between PD and TJ (neglecting PI/O):
PD = K ÷ (TJ + 273 °C)
(2)
Solving equations (1) and (2) for K gives:
K = PD × (TA + 273 °C) + θJA × (PD)
2
(3)
where K is a constant pertaining to the particular part. K can be determined from equation (3) by
measuring PD (at equilibrium) for a known TA. Using this value of K, the values of PD and TJ can be
obtained by solving equations (1) and (2) iteratively for any value of TA.
Figure 13-1. Test Load
Characteristic
Symbol
Value
Unit
Thermal resistance
Plastic dual in-line package
Plastic leaded chip carrier (PLCC)
Quad flat pack (QFP0)
Plastic shrink DIP (SDIP)
θJA
60
70
95
60
°C/W
VDD = 3.0 V
Pins
R1
R2
C
PA7–PA0
PB7–PB0
PC7–PC0
PD5–PD0, PD7
10.91
6.32
50 pF
VDD = 4.5 V
Pins
R1
R2
C
PA7–PA0
PB7–PB0
PC7–PC0
PD5–PD0, PD7
3.26
2.38
50 pF
VDD
C
R2
R1
TEST
POINT
SEE
SEE TABLE
TABLE
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