參數(shù)資料
型號: MC68HLC705KJ1CDWR2
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, PDSO16
封裝: SOIC-16
文件頁數(shù): 20/144頁
文件大小: 1377K
代理商: MC68HLC705KJ1CDWR2
Technical Data
MC68HC705KJ1 — Rev. 2.0
116
Electrical Specifications
MOTOROLA
Electrical Specications
11.5 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.
T
J
T
A
P
D
θ
×
JA
()
+
=
P
D
K
T
J
273
°C
+
------------------------------
=
= PD x (TA + 273 C) +ΘJA x (PD)
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