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AM186ES-40VCW 数据表(PDF) 56 Page - Advanced Micro Devices

部件名 AM186ES-40VCW
功能描述  High Performance, 80C186-/80C188-Compatible and 80L186-/80L188-Compatible, 16-Bit Embedded Microcontrollers
PDF  102 Pages
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM186ES-40VCW 数据表(HTML) 56 Page - Advanced Micro Devices

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56
Am186/188ES and Am186/188ESLV Microcontrollers
PRELIMIN ARY
Typical Ambient Temperatures
The typical ambient temperature specifications are
based on the following assumptions and calculations:
The commercial operating range of the Am186ES and
Am188ES microcontrollers is a case temperature TC of
0 to 100 degrees Centigrade. TC is measured at the top
center of the package. An increase in the ambient
temperature causes a proportional increase in TC.
The 40-MHz microcontroller is specified as 5.0 V plus
or minus 5%. Therefore, 5.25 V is used for calculating
t y pical p o we r consum ptio n on the 40- MH z
microcontroller.
Microcontrollers up to 33 MHz are specified as 5.0 V
plus or minus 10%. Therefore, 5.5 V is used for
calculating typical power consumption up to 33 MHz.
Typical power supply current (ICC) in normal usage is
estimated at 5.9 mA per MHz of microcontroller clock
rate.
Typical power consumption (watts) = (5.9 mA/MHz)
times microcontroller clock rate times voltage divided
by 1000.
Table 11 shows the variables that are used to calculate
the typical power consumption value for each version
of the Am186ES and Am188ES microcontrollers.
Table 11.
Typical Power Consumption
Calculation
Thermal resistance is a measure of the ability of a
package to remove heat from a semiconductor device.
A safe operating range for the device can be calculated
using the formulas from Figure 14 and the variables in
Table 10.
By using the maximum case rating TC, the typical
power consumption value from Table 11, and
θ
JC from
Ta ble 10, the junction temp eratu re TJ can be
calculated by using the following formula from Figure
14.
TJ = TC + (P ⋅ θJC)
Table 12 shows TJ values for the various versions of
the Am186ES and Am188ES microcontrollers. The
column titled
Speed/Pkg/Board in Table 12 indicates
the clock speed in MHz, the type of package (P for
PQFP and T for TQFP), and the type of board (2 for 2-
layer and 4-6 for 4-layer to 6-layer).
Table 12.
Junction Temperature Calculation
By using TJ from Table 12, the typical power
consumption value from Table 11, and a
θ
JA value from
Table 10, the typical ambient temperature TA can be
calculated using the following formula from Figure 14:
TA = TJ – (P ⋅ θJA)
For example, TA for a 40-MHz PQFP design with a 2-
layer board and 0 fpm airflow is calculated as follows:
TA = 108.673 – (1.239 ⋅ 45)
TA = 52.918
In this calculation, TJ comes from Table 12, P comes
from Table 11, and
θ
JA comes from Table 10. See Table
13.
TA for a 33-MHz TQFP design with a 4-layer to 6-layer
board and 200 fpm airflow is calculated as follows:
TA = 106.4251 – (1.07085 ⋅ 28)
TA = 76.4413
See Table 16 for the result of this calculation.
Table 13 through Table 16 and Figure 15 through
F i gu r e 1 8 sh ow T A based on th e prec eding
assumptions and calculations for a range of
θ
JA values
with airflow from 0 linear feet per minute to 600 linear
feet per minute.
P = MHz
⋅ I
CC
⋅ Volts / 1000
Typical
Power (P) in
Watts
MHz
Typical ICC
Volts
40
5.9
5.25
1.239
33
5.9
5.5
1.07085
25
5.9
5.5
0.81125
20
5.9
5.5
0.649
Speed/
Pkg/
Board
TJ
TJ = TC + (P
⋅ θ
JC)
TC
P
θ
JC
40/P2
108.673
100
1.239
7
40/T2
112.39
100
1.239
10
40/P4-6
106.195
100
1.239
5
40/T4-6
107.434
100
1.239
6
33/P2
107.49595
100
1.07085
7
33/T2
110.7085
100
1.07085
10
33/P4-6
105.35425
100
1.07085
5
33/T4-6
106.4251
100
1.07085
6
25/P2
105.67875
100
0.81125
7
25/T2
108.1125
100
0.81125
10
25/P4-6
104.05625
100
0.81125
5
25/T4-6
104.8675
100
0.81125
6
20/P2
104.543
100
0.649
7
20/T2
106.49
100
0.649
10
20/P4-6
103.245
100
0.649
5
20/T4-6
103.894
100
0.649
6



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