參數(shù)資料
型號: MC68HLC705KJ1CP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PDIP16
封裝: PLASTIC, DIP-16
文件頁數(shù): 105/117頁
文件大?。?/td> 1644K
代理商: MC68HLC705KJ1CP
Electrical Specifications
Data Sheet
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 4.0
88
Electrical Specifications
MOTOROLA
10.4 Power Considerations
The average chip junction temperature, TJ, in °C can be obtained from:
(1)
where:
TA = ambient temperature in °C
θ
JA = package thermal resistance, junction to ambient in °C/W
PD = PINT + PI/O
PINT = ICC × VCC = chip internal power dissipation
PI/O = power dissipation on input and output pins (user-determined)
For most applications, PI/O
PINT and can be neglected.
Ignoring PI/O, the relationship between PD and TJ is approximately:
(2)
Solving equations (1) and (2) for K gives:
(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.
TJ
TA
PD
θ
×
JA
()
+
=
PD
K
TJ
273
°C
+
-----------------------------------
=
= PD x (TA + 273°C) + ΘJA x (PD)
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