Power and clock management
RM0082
824/844
Doc ID 018672 Rev 1
The following information provides details about the condition under which values could be
obtained:
●
Data based on characterization, results tested at nominal VDD
●
Several STD selected SPEAr revision B, tested on the device demoboard with external
power supply dedicated to SPEAr
●
For NORMAL state DDR2 clocked by PLL2 @ 333 MHz (166 MHz below)
●
UBOOT code running (except for Linux measures)
●
Temperature am25°C
Note:
1
Linux all modules clocked
2
Mobile DDR benefits power consumption reduction cross 1.8V power line. It is in the range
of 15 to 35mA vs 50 to 90mA of a DDR2@166 MHz.
37.8.1
Modules power consumption
In the following table are reported power consumption values for different modules, there are
also columns that show current consumption on different input voltages.
Note:
3.3V current is primarily dependent on the capacitive loading, frequency and utilization of
the external buses.
Table 740.
Power and current consumption for modules
Module
Power mW
CPU@333
MHz
1V2 current
mA
1V8
current
mA
2V5
current
mA
3V3
current
mA
ARM SDRAM
379
164
54
25.0
6.4
ARM+SDRAM+All USB ports
434
181
62
32.3
7.3
ARM+SDRAM+Ethernet
394
169
59
25.2
6.4
ARM+SDRAM+CLCD Ctrl
419
164
63
25.3
13.6
ARM+SDRAM+C3 Ctrl
449
195
72
25.2
6.4
ARM+SDRAM+All modules
531
212
84
32.3
13.6
Table 741.
Delta power consumption for modules
Module
Power
mW
CPU@12
MHz
Power
mW
CPU@24
MHz
Power
mW
CPU@
75 MHz
Power
mW
CPU@
133
MHz
Power
mW
CPU@
166 MHz
Power
mW
CPU@
266 MHz
Power
mW
CPU@
332 MHz
ARM+SDRAM
283
289
305
325
335
362
379
All USB ports
16.8
16.9
28.6
37.5
42.3
535
55.7
Ethernet
1.7
2.0
2.6
4.6
7.8
14.4
15.0
CLCD Ctrl
15.4
15.6
35.8
36.4
36.5
40.4
40.4
C3
1.1
2.4
6.2
9.8
38.0
57.5
70.3
ARM and all IPs
359
362
371
417
434
483
531