参数资料
型号: MC68HC05T7B
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, PDIP56
封装: SDIP-56
文件页数: 19/109页
文件大小: 9008K
代理商: MC68HC05T7B
Technical Data
MC68HC705KJ1MC68HRC705KJ1MC68HLC705KJ1 — Rev. 3.0
118
Electrical Specifications
MOTOROLA
Electrical Specifications
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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