ADSP-21486KSWZ-2AB datasheet(20/71 Pages) AD

20 / 71 page

Rev. H

Page 20 of 71

February 2020

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 (IDD_INT_STATIC) as a function of

junction temperature (TJ) and core voltage (VDD_INT).

• Dynamic current (IDD_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—IDD_INT_STATIC (mA)

TJ (°C)

VDD_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

107

118

131

144

159

–35

103

114

126

140

154

170

–25

101

113

125

138

153

168

185

–15

104

115

127

140

155

171

187

205

–5

109

121

133

147

161

177

194

212

233

129

142

156

171

188

206

225

245

268

+15

152

168

183

201

219

240

261

285

309

+25

182

199

216

237

257

280

305

331

360

+35

217

237

256

279

303

329

358

388

420

+45

259

282

305

331

359

389

421

455

492

+55

309

334

361

391

423

458

495

533

576

+65

369

398

429

464

500

539

582

626

675

+75

437

471

506

547

588

633

682

731

789

+85

519

559

599

645

693

746

802

860

926

+95

615

662

707

761

816

877

942

1007

1083

+105

727

779

833

897

958

1026

1103

1179

1266

+115

853

914

975

1047

1119

1198

1285

1372

1473

+125

997

1067

1138

1219

1305

1397

1498

1601

1716

1 Valid temperature and voltage ranges are model-specific. See Operating Conditions on Page 18.

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