AM186ED-20KCSLASHW datasheet(52/88 Pages) AMD

52 / 88 page

Am186ED/EDLV Microcontrollers

PRELI M INARY

F T

Typical Ambient Temperatures

The typical ambient temperature specifications are

based on the following assumptions and calculations:

The commercial operating range of the Am186ED

microcontroller 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.

Microcontrollers up to 40 MHz are specified as 5.0 V

plus or minus 10%. Therefore, 5.0 V is used for

calculating typical power consumption up to 40 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 VCC divided by

1000.

Table 12 shows the variables that are used to calculate

the typical power consumption value for each version

of the Am186ED microcontroller.

Table 12.

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 11.

By using the maximum case rating TC, the typical

power consumption value from Table 12, and

JC from

Table 11, the junction temperature TJ can be calculated

by using the following formula from Figure 14.

TJ = TC + (P

⋅ θ

JC)

Table 13 shows TJ values for the various versions of

the Am186ED microcontroller. The column titled

Speed/Pkg/Board in Table 13 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 13.

Junction Temperature Calculation

By using TJ from Table 13, the typical power

consumption value from Table 12, and a

JA value from

Table 11, 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 = 108.3 – (1.2 ⋅ 45)

TA = 55.2

In this calculation, TJ comes from Table 13, P comes

from Table 12, and

JA comes from Table 11. See Table

14.

TA for a 33-MHz TQFP design with a 4-layer to 6-layer

board and 200 fpm airflow is calculated as follows:

TA = 105.8 – (1.0 ⋅ 28)

TA = 78.6

See Table 17 for the result of this calculation.

Table 14 through Table 17 and Figure 15 through

Fi gu r e 18 s h ow TA based on the prec eding

assumptions and calculations for a range of

JA values

with airflow from 0 linear feet per minute to 600 linear

feet per minute.

P = MHz

⋅ I

⋅ V

CC/1000

Typical

Power (P) in

Watts

MHz

Typical ICC

Volts

5.9

5.0

1.2

5.9

5.0

1.0

5.9

5.0

0.7

5.9

5.0

0.6

Speed/

Pkg/

Board

TJ(°C)

TJ = TC + (P

⋅ θ

JC)

40/P2

108.3

100

1.2

40/T2

111.8

100

1.2

40/P4-6

105.9

100

1.2

40/T4-6

107.1

100

1.2

33/P2

106.8

100

1.0

33/T2

109.7

100

1.0

33/P4-6

104.9

100

1.0

33/T4-6

105.8

100

1.0

25/P2

105.2

100

0.7

25/T2

107.4

100

0.7

25/P4-6

103.7

100

0.7

25/T4-6

104.4

100

0.7

20/P2

104.1

100

0.6

20/T2

105.9

100

0.6

20/P4-6

103.0

100

0.6

20/T4-6

103.5

100

0.6

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