AM186EM-33VCSLASHW datasheet(53/98 Pages) AMD

53 / 98 page

Am186/188EM and Am186/188EMLV Microcontrollers

P R E L IMINAR Y

Power Supply Current

For the typical system specification shown in Figure 13,

ICC has been measured at 3.0 mA per MHz of system

clock. For the typical system specification shown in Fig-

ure 14, ICC has been measured at 4.5 mA per MHz of sys-

tem clock. The typical system is measured while the

system is executing code in a typical application with max-

imum voltage and at room temperature. Actual power sup-

ply current is dependent on system design and may be

greater or less than the typical ICC figure presented here.

Typical current in Figure 13 is given by:

................. ICC = 3.0 mA ⋅ freq(MHz).

Typical current in Figure 14 is given by:

................. ICC = 4.5 mA ⋅ freq(MHz).

Please note that dynamic ICC measurements are de-

pendent upon chip activity, operating frequency, output

buffer logic, and capacitive/resistive loading of the out-

puts. For these ICC measurements, the devices were

set to the following modes:

n No DC loads on the output buffers

n Output capacitive load set to 35 pF

n AD bus set to data only

n PIOs are disabled

n Timer, serial port, refresh, and DMA are enabled

Table 7 shows the variables that are used to calculate

the typical power consumption value for each version

of the Am186EMLV and Am188EMLV microcontrol-

lers.

Table 7.

Typical Power Consumption Calculation

for the Am186EMLV and Am188EMLV

Figure 13.

Typical ICC Versus Frequency for the

Am186EMLV and Am188EMLV

Figure 14.

Typical ICC Versus Frequency for the Am186EM and Am188EM

MHz

⋅ I

⋅ Volts / 1000 = P

Typical Power

in Watts

MHz

Typical ICC

Volts

3.0

3.6

0.173

3.0

3.6

0.216

3.0

3.6

0.270

Clock Frequency (MHz)

ICC (mA)

25 MHz

20 MHz

100

120

140

16 MHz

Clock Frequency (MHz)

ICC (mA)

120

160

200

240

280

20 MHz

25 MHz

33 MHz

40 MHz

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