参数资料
型号: MC68HC05C9EFB
厂商: MOTOROLA 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: 27/144页
文件大小: 1628K
代理商: MC68HC05C9EFB
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Electrical Specifications
Advance Information
MC68HC05C9E
122
Electrical Specifications
MOTOROLA
12.5 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.
The following is an approximate relationship between PD and TJ
(neglecting PJ):
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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