Datasheet

Rev. B | Page 20 of 68 | March 2013
ADSP-21483/ADSP-21486/ADSP-21487/ADSP-21488/ADSP-21489
Total Power Dissipation
The information in this section should be augmented with the
Engineer-to-Engineer Note “Estimating Power for ADSP-214xx
SHARC Processors” (EE-348).
Total power dissipation has two components:
1. Internal power consumption is additionally comprised of
two components:
• Static current due to leakage. Table 14 shows the static
current consumption (I
DD_INT_STATIC
) as a function of
junction temperature (T
J
) and core voltage (V
DD_INT
).
• Dynamic current (I
DD_INT_DYNAMIC
), due to transistor
switching characteristics and activity level of the pro-
cessor. The activity level is reflected by the Activity
Scaling Factor (ASF), which represents the activity
level of the application code running on the processor
core and having various levels of peripheral and exter-
nal port activity (Table 13).
Dynamic current consumption is calculated by select-
ing the ASF that corresponds most closely with the
user application and then multiplying that with the
dynamic current consumption (Table 15).
2. External power consumption is due to the switching activ-
ity of the external pins.
Table 13. Activity Scaling Factors (ASF)
1
Activity Scaling Factor (ASF)
Idle 0.29
Low 0.53
Medium Low 0.61
Medium High 0.77
Peak Typical (50:50)
2
0.85
Peak Typical (60:40)
2
0.93
Peak Typical (70:30)
2
1.00
High Typical 1.16
High 1.25
Peak 1.31
1
See the Engineer-to-Engineer Note “Estimating Power for ADSP-214xx SHARC
Processors” (EE-348) for more information on the explanation of the power
vectors specific to the ASF table.
2
Ratio of continuous instruction loop (core) to SDRAM control code reads and
writes.
Table 14. Static Current—I
DD_INT_STATIC
(mA)
1
T
J
(°C)
V
DD_INT
(V)
0.975 V 1.0 V 1.025 V 1.05 V 1.075 V 1.10 V 1.125 V 1.15 V 1.175 V
–45 68 77 86 96 107 118 131 144 159
–35 74 83 92 103 114 126 140 154 170
–25 82 92 101 113 125 138 153 168 185
–15 94 104 115 127 140 155 171 187 205
–5 109 121 133 147 161 177 194 212 233
[phone] 188 206 225 245 268
[phone] 219 240 261 285 309
[phone] 257 280 305 331 360
[phone] 303 329 358 388 420
[phone] 359 389 421 455 492
[phone] 423 458 495 533 576
[phone] 500 539 582 626 675
[phone] 588 633 682 731 789
[phone] 693 746 802 860 926
[phone] 816 877 942 1007 1083
[phone] 958 1026 1103 1179 1266
[phone] 1047 1119 1198 1285 1372 1473
[phone] 1219 1305 1397 1498 1601 1716
1
Valid temperature and voltage ranges are model-specific. See Operating Conditions on Page 18.