Datasheet
ADSP-21469
Rev. 0 | Page 19 of 72 | June 2010
Total Power Dissipation
Total power dissipation has two components:
1. Internal power consumption
2. External power consumption
Internal power consumption also comprises two components:
1. Static, due to leakage current. Table 12 shows the static cur-
rent consumption (I
DD-STATIC
) as a function of junction
temperature (T
J
) and core voltage (V
DD_INT
).
2. Dynamic (I
DD-DYNAMC
), due to transistor switching char-
acteristics and activity level of the processor. The activity
level is reflected by the Activity Scaling Factor (ASF), which
represents application code running on the processor core
and having various levels of peripheral and external port
activity (Table 11). Dynamic current consumption is calcu-
lated by scaling the specific application by the ASF and
using baseline dynamic current consumption as a
reference.
External power consumption is due to the switching activity of
the external pins.
The ASF is combined with the CCLK frequency and V
DD_INT
dependent data in Table 13 to calculate this part. The second
part is due to transistor switching in the peripheral clock
(PCLK) domain, which is included in the I
DD_INT
specification
equation.
Table 11. Activity Scaling Factors (ASF)
1
1
See Estimating Power for SHARC Processors (EE-348) for more information on
the explanation of the power vectors specific to the ASF table.
Activity Scaling Factor (ASF)
Idle 0.38
Low 0.58
High 1.23
Peak 1.35
Peak-typical (50:50)
2
2
Ratio of continuous instruction loop (core) to DDR2 control code reads:writes.
0.87
Peak-typical (60:40) 0.94
Peak-typical (70:30) 1.00
Table 12. I
DD-STATIC
(mA)
T
J
(°C)
1
V
DD_INT
(V)
1
0.95 V 1.0 V 1.05 V 1.10 V 1.15 V
–45 72 91 110 140 167
–35 79 99 119 149 181
–25 89 109 131 163 198
–15 101 122 145 182 220
–5 115 140 166 206 249
5 134 162 192 237 284
15 158 189 223 273 326
25 186 222 260 318 377
35 218 259 302 367 434
45 258 305 354 428 503
55 305 359 413 497 582
65 360 421 484 578 675
75 424 496 566 674 781
85 502 580 660 783 904
95 586 683 768 912 1048
105 692 794 896 1054 1212
115 806 921 1036 1220 1394
125 939 1070 1198 1404 1601
1
Valid temperature and voltage ranges are model-specific. See Operating Conditions on Page 17.