Lattice Semiconductor

ispPAC-POWR1208P1 Data Sheet

3-10

Table 3-1 shows all possible comparator trip point voltage settings. There are 384 available voltages, ranging from

0.680V to 5.932V, as well as a ‘near-ground’ monitor threshold of 80mV which can be used to determine if a power

supply rail has completely discharged to an OFF state. In addition to these 385 voltage monitor trip points, the user

can add external resistors to divide down the voltage and achieve virtually any voltage trip point. This allows the

capability to monitor higher voltages such and 12V, 15V, 24V, etc. Voltage monitor trip points are set in the graphical

user interface of PAC-Designer software by simple pull-down menus. The user simply selects the given range and

corresponding trip point value. Attenuation and reference values are set internally using E

internal to the device.

Theory Of Operation

The ispPAC-POWR1208P1 incorporates programmable voltage monitors along with digital inputs and outputs as

well as high voltage FET gate drivers to control MOSFETs for ramping up power supply rails. The 16 macrocell

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10

11

12

0

0.680

0.808

0.962

1.142

1.363

1.618

1.931

2.289

2.724

3.241

4.221

5.017

1

0.684

0.812

0.968

1.149

1.371

1.628

1.942

2.302

2.741

3.260

4.246

5.046

2

0.688

0.817

0.974

1.156

1.378

1.637

1.954

2.316

2.757

3.279

4.270

5.076

3

0.692

0.822

0.979

1.162

1.386

1.647

1.965

2.329

2.773

3.298

4.295

5.105

4

0.696

0.827

0.985

1.169

1.394

1.656

1.976

2.342

2.789

3.318

4.320

5.135

5

0.700

0.831

0.990

1.176

1.402

1.666

1.988

2.356

2.805

3.337

4.345

5.164

6

0.704

0.836

0.996

1.182

1.410

1.675

1.999

2.369

2.821

3.356

4.370

5.194

7

0.708

0.841

1.002

1.189

1.418

1.685

2.010

2.383

2.837

3.375

4.394

5.224

8

0.712

0.845

1.007

1.196

1.426

1.694

2.021

2.396

2.853

3.394

4.419

5.253

9

0.716

0.850

1.013

1.202

1.434

1.704

2.033

2.410

2.869

3.413

4.444

5.283

10

0.720

0.855

1.019

1.209

1.442

1.713

2.044

2.423

2.885

3.432

4.469

5.312

11

0.724

0.860

1.024

1.216

1.450

1.723

2.055

2.437

2.901

3.451

4.494

5.342

12

0.728

0.864

1.030

1.222

1.458

1.732

2.067

2.450

2.917

3.470

4.518

5.371

13

0.732

0.869

1.035

1.229

1.466

1.742

2.078

2.464

2.933

3.489

4.543

5.401

14

0.736

0.874

1.041

1.236

1.474

1.751

2.089

2.477

2.949

3.508

4.568

5.430

15

0.740

0.878

1.047

1.243

1.482

1.761

2.101

2.490

2.965

3.527

4.593

5.460

16

0.744

0.883

1.052

1.249

1.490

1.770

2.112

2.504

2.981

3.547

4.618

5.489

17

0.748

0.888

1.058

1.256

1.498

1.780

2.123

2.517

2.997

3.566

4.642

5.519

18

0.752

0.893

1.064

1.263

1.506

1.789

2.135

2.531

3.013

3.585

4.667

5.548

19

0.756

0.897

1.069

1.269

1.514

1.799

2.146

2.544

3.029

3.604

4.692

5.578

20

0.760

0.902

1.075

1.276

1.522

1.808

2.157

2.558

3.045

3.623

4.717

5.607

21

0.764

0.907

1.081

1.283

1.530

1.818

2.169

2.571

3.061

3.642

4.742

5.637

22

0.768

0.911

1.086

1.289

1.538

1.827

2.180

2.585

3.077

3.661

4.766

5.666

23

0.772

0.916

1.092

1.296

1.546

1.837

2.191

2.598

3.093

3.680

4.791

5.696

24

0.776

0.921

1.097

1.303

1.554

1.846

2.203

2.612

3.109

3.699

4.816

5.726

25

0.780

0.926

1.103

1.310

1.562

1.856

2.214

2.625

3.125

3.718

4.841

5.755

26

0.784

0.930

1.109

1.316

1.570

1.865

2.225

2.638

3.141

3.737

4.866

5.785

27

0.787

0.935

1.114

1.323

1.578

1.875

2.237

2.652

3.157

3.756

4.890

5.814

28

0.791

0.940

1.120

1.330

1.586

1.884

2.248

2.665

3.173

3.776

4.915

5.844

29

0.795

0.944

1.126

1.336

1.594

1.894

2.259

2.679

3.189

3.795

4.940

5.873

30

0.799

0.949

1.131

1.343

1.602

1.903

2.271

2.692

3.205

3.814

4.965

5.903

31

0.803

0.954

1.137

1.350

1.610

1.913

2.282

2.706

3.221

3.833

4.990

5.932