P R E L I M I N A R Y
Table 7 shows the variables that are used to calculate
Power Supply Current
the typical power consumption value for each version
of the Am186EMLV and Am188EMLV microcontrol-
lers.
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.
Table 7. Typical Power Consumption Calculation
for the Am186EMLV and Am188EMLV
MHz ICC Volts / 1000 = P
TypicalPower
in Watts
MHz
Typical ICC
Volts
16
20
25
3.0
3.0
3.0
3.6
3.6
3.6
0.173
0.216
0.270
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:
140
120
100
80
n No DC loads on the output buffers
n Output capacitive load set to 35 pF
n AD bus set to data only
25 MHz
20 MHz
16 MHz
60
ICC (mA)
40
n PIOs are disabled
20
0
n Timer, serial port, refresh, and DMA are enabled
10
20
30
Clock Frequency (MHz)
Figure 13. Typical ICC Versus Frequency for the
Am186EMLV and Am188EMLV
280
240
200
160
40 MHz
33 MHz
25 MHz
120
ICC (mA)
20 MHz
80
40
0
10
20
30
40
Clock Frequency (MHz)
Figure 14. Typical ICC Versus Frequency for the Am186EM and Am188EM
Am186/188EM and Am186/188EMLV Microcontrollers
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AMD [ AMD ]
