参数资料
型号: XC68HC705X4DW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PDSO28
封装: SOIC-28
文件页数: 32/168页
文件大小: 656K
代理商: XC68HC705X4DW
Electrical Characteristics
Thermal characteristics and power considerations
MC68HC05X4 Rev 1.0
MOTOROLA
Electrical Characteristics
127
where:
TA = Ambient temperature (°C)
θ
JA = Package thermal resistance, junction-to-ambient (°C/W)
PD = PINT + PI/O (W)
PINT = Internal chip power = IDD VDD (W)
PI/O = Power dissipation on input and output pins (user determined)
An approximate relationship between PD and TJ (if PI/O is neglected) is:
Solving equations [1] and [2] for K gives:
where K is a constant for a particular part. K can be determined by
measuring PD (at equilibrium) for a known TA. Using this value of K, the
values of PD and TJ can be obtained for any value of TA by solving the
above equations. The package thermal characteristics are shown in
Table 1.
[1]
[2]
[3]
Figure 2. Equivalent test load
T
J
T
A
P
D
θ
JA
()
+
=
P
D
K
T
J
273
+
-----------------------
=
KP
D
T
A
273
+
()
θ
JA
P
D
2
+
=
VDD = 4.5 V
R2
R1
C
Test
point
Pins
R1
R2
C
PA0–7, PB0–7
3.26k
2.38k 50pF
TX0, TX1
0.25k
0.25k 50pF
3-elec
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