參數資料
型號: MC68HC705J2S
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER, CDIP20
封裝: WINDOWED, CERDIP-20
文件頁數: 65/82頁
文件大?。?/td> 2545K
代理商: MC68HC705J2S
ELECTRICAL SPECIFICATIONS
11-2
Rev. 2
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11.3 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.
The 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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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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