MB91360G Series
188
4.
Run Mode Current/Power Consumption
The power dissipation during normal operation is determined by the total power dissipation of the internal logic
P
C
, the dissipation from analog modules P
A
and the power dissipation P
IO
of the I/O buffers. Among the I/O buffers
the dissipation caused by the stepper motor drivers P
SMC
should be taken into special consideration.
So the overall power consumption P
D
will be calculated as a sum of Pc
+
P
A
+
P
SMC
+
P
IO .
(1) Logic Power Consumption
The following formula can be used to calculate the maximum core current consumption when the PLL is used
depending on the frequency settings for the internal clocks :
I
CC
=
3.45 [mA/MHz]
×
CLKB [MHz]
+
2.52 [mA/MHz]
×
CLKP[MHz]
+
0.72 [mA/MHz]
×
CLKT [MHz]
+
35.5 mA.
If clock modulation is used the following value must be added to this result : 0.24 [mA/MHz]
×
CLKB [MHz].
This results in the following values (higher clock settings are not allowed) :
Clock frequencies [MHz]
Maximum Core
Current
Consumption [mA]
CLKB
CLKP
CLKT
In addition to this power consumption of the MCU core logic the following contributions to the overall power con-
sumption have to be considered :
(2) Analog Power Consumption
To calculate the analog power consumption P
A
, the current contributions of the active modules have to be multi-
plied by the maximum analog supply voltage of 5.1 V-or by the maximum digital supply voltage as in case of the
Power down reset.
Logic Power
Consumption
P
C
at 5.25 V [mW]
Remarks
64
16
16
308
1.70
no clock modulation possible
48
24
24
290
1.52
48
16
16
264
1.40
32
32
32
257
1.35
32
16
16
205
1.08
24
24
24
202
1.06
24
12
12
163
0.86
16
16
16
146
0.77
2
2
2
40
0.21
no PLL, no clock modulation
0.125
0.125
0.125
30
0.16
no PLL, no clock modulation
Module
Typical Current
Consumption
Maximum Current
Consumption
Remarks
DAC
1 mA / channel
current at AVCC
ADC
3 mA
7 mA
current at AVCC
1.6 mA
2.6 mA
current at AVRH
Power down reset
0.26 mA
0.5 mA
current at Vdd
Alarm Comparator
0.31 mA
0.5 mA
current at AVCC
Zero point detection
0.13 mA
0.25 mA
current at AVCC