参数资料
型号: MC68HSC05C4AB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 4.1 MHz, MICROCONTROLLER, PDIP42
封装: SHRINK, PLASTIC, DIP-42
文件页数: 20/156页
文件大小: 992K
代理商: MC68HSC05C4AB
NON-DISCLOSURE
AGREEMENT
REQUIRED
Electrical Specications
General Release Specification
MC68HC05C4A Rev. 4.0
116
Electrical Specifications
13.6 Power Considerations
The average chip-junction temperature, TJ, in °C, can be obtained from:
TJ= TA + (PD × θJA)
(1)
Where:
TA = Ambient temperature, °C
θ
JA = 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.
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