(-5.50 mV /

oC) u

V =

T + 1035 mV

(-5.50 mV /

oC) u

V - 925 mV =

(T - 20

oC)

760 mV - 925 mV

50

oC - 20oC

u

¹

·

V - 925 mV =

(T - 20

oC)

V2 - V1

T2 - T1

u

¹

·

V - V1 =

(T - T1)

2

TEMP

2

2

TEMP

2

2

TEMP

2

TEMP

mV

mV

J2,G00 : V

mV = 870.6mV - 5.506

T - 30°C - 0.00176

T - 30°C

°C

°C

mV

mV

J3,G01 : V

mV = 1324.0mV - 8.194

T - 30°C - 0.00262

T - 30°C

°C

°C

mV

mV

J4,G10 : V

mV = 1777.3mV - 10.888

T - 30°C - 0.00347

T - 30°C

°C

°C

J5,G11 : V

mV = 2230.8mV

2

2

mV

mV

- 13.582

T - 30°C - 0.00433

T - 30°C

°C

°C

LM94021

SNIS138E – FEBRUARY 2005 – REVISED JUNE 2013

www.ti.com

Table 2. LM94021 Transfer Table (continued)

TEMPERATURE

GS = 00

GS = 01

GS = 10

GS = 11

(°C)

(mV)

(mV)

(mV)

(mV)

129

308

487

665

843

130

302

478

653

829

131

296

469

642

814

132

291

460

630

800

133

285

452

618

786

134

279

443

607

771

135

273

434

595

757

136

267

425

584

742

137

261

416

572

728

138

255

408

560

713

139

249

399

549

699

140

243

390

537

684

141

237

381

525

670

142

231

372

514

655

143

225

363

502

640

144

219

354

490

626

145

213

346

479

611

146

207

337

467

597

147

201

328

455

582

148

195

319

443

568

149

189

310

432

553

150

183

301

420

538

Although the LM94021 is very linear, its response does have a slight umbrella's parabolic shape. This shape is

very accurately reflected in the LM94021 Transfer Table. The Transfer Table can be calculated by using the

parabolic equation.

(1)

For a linear approximation, a line can easily be calculated over the desired temperature range from the Table

using the two-point equation:

(2)

Where V is in mV, T is in °C, T1 and V1 are the coordinates of the lowest temperature, T2 and V2 are the

coordinates of the highest temperature.

For example, if we want to determine the equation of a line with the Gain Setting at GS1 = 0 and GS0 = 0, over a

temperature range of 20°C to 50°C, we would proceed as follows:

(3)

(4)

(5)

12

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