AM186EM Datasheet, PDF (53/98 Pages) List of Unclassifed Manufacturers – MICROCONTROLLER BLOCK DIAGRAM

PRELIMINARY
Power Supply Current
For the typical system specification shown in Figure 13,
I_CC has been measured at 3.0 mA per MHz of system
clock. For the typical system specification shown in Fig-
ure 14, I_CC 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 I_CC figure presented here.
Typical current in Figure 13 is given by:
................. I_CC = 3.0 mA ⋅ freq(MHz).
Typical current in Figure 14 is given by:
................. I_CC = 4.5 mA ⋅ freq(MHz).
Please note that dynamic I_CC measurements are de-
pendent upon chip activity, operating frequency, output
buffer logic, and capacitive/resistive loading of the out-
puts. For these I_CC 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
MHz ⋅ I_CC ⋅ Volts / 1000 = P
MHz
Typical I_CC Volts
16
3.0
3.6
Typical Power
in Watts
0.173
20
3.0
3.6
0.216
25
3.0
3.6
0.270
140
120
100
80
60
I_CC (mA)
40
25 MHz
20 MHz
16 MHz
20
0
10
20
30
Clock Frequency (MHz)
Figure 13. Typical I_CC Versus Frequency for the
Am186EMLV and Am188EMLV
280
240
200
160
120
I_CC (mA)
80
20 MHz
33 MHz
25 MHz
40 MHz
40
0
10
20
30
40
Clock Frequency (MHz)
Figure 14. Typical I_CC Versus Frequency for the Am186EM and Am188EM
Am186/188EM and Am186/188EMLV Microcontrollers
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