LM94022EVAL National Semiconductor, LM94022EVAL Datasheet - Page 11

• Manufacturer Part Number: LM94022EVAL
• Description: BOARD EVALUATION LM94022
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM94022EVAL

• Sensor Type: Temperature
• Sensing Range: -50°C ~ 150°C
• Interface: Analog
• Sensitivity: ±1.5°C
• Voltage - Supply: 1.5 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: LM94022
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Although the LM94022 is very linear, its response does have
a slight downward parabolic shape. This shape is very accu-
Temperat
ure
(°C)
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
GS = 00
(mV)
296
291
285
279
273
267
261
255
249
243
237
231
225
219
213
207
201
195
189
183
GS = 01
(mV)
469
460
452
443
434
425
416
408
399
390
381
372
363
354
346
337
328
319
310
301
GS = 10
(mV)
642
630
618
607
595
584
572
560
549
537
525
514
502
490
479
467
455
443
432
420
GS = 11
(mV)
814
800
786
771
757
742
728
713
699
684
670
655
640
626
611
597
582
568
553
538
11
rately reflected in the LM94022 Transfer Table. For a linear
approximation, a line can easily be calculated over the de-
sired temperature range from the Table using the two-point
equation:
Where V is in mV, T is in °C, T
the lowest temperature, T
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 tem-
perature range of 20°C to 50°C, we would proceed as follows:
Using this method of linear approximation, the transfer func-
tion can be approximated for one or more temperature ranges
of interest.
2
and V
1
and V
2
are the coordinates of the
1
are the coordinates of
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