LM26LVCISD-105/NOPB National Semiconductor, LM26LVCISD-105/NOPB Datasheet - Page 14

• Manufacturer Part Number: LM26LVCISD-105/NOPB
• Description: IC TEMP SENS/SWITCH 105C 6LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM26LVCISD-105/NOPB

• Sensing Temperature: 105°C Trip Point
• Output Type: Active High/Push Pull, Active Low/Open Drain, Voltage
• Voltage - Supply: 1.6 V ~ 5.5 V
• Accuracy: ±2.2°C
• Package / Case: 6-WDFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM26LVCISD-105TR

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1.1 V
The LM26LV's V
ear. The Conversion Table above and the equation in Section
1.1.1 represent the most accurate typical performance of the
V
TEMP
Temp.,
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
Die
TEMP
°C
voltage output vs Temperature.
vs DIE TEMPERATURE APPROXIMATIONS
Gain 1:
T
0-69°C
TRIP
459
453
448
443
437
432
427
421
416
411
405
400
395
389
384
379
373
368
362
357
352
346
341
336
330
325
320
314
309
303
298
293
287
282
277
for
TEMP
V
TEMP
=
analog temperature output is very lin-
, Analog Output Voltage, mV
70-109°C
Gain 2:
T
TRIP
687
679
671
663
655
647
639
631
623
615
607
599
591
583
575
567
559
551
543
535
527
519
511
503
495
487
479
471
463
455
447
438
430
422
414
for
=
110-129°C
Gain 3:
T
TRIP
916
905
894
884
873
862
852
841
831
820
809
798
788
777
766
756
745
734
724
713
702
691
681
670
659
649
638
627
616
606
595
584
573
562
552
for
=
130-150°C
Gain 4:
T
1145
1131
1118
1105
1091
1078
1065
1051
1038
1025
1011
TRIP
998
985
971
958
945
931
918
904
891
878
864
851
837
824
811
797
784
770
757
743
730
716
703
690
for
=
14
1.1.1 The Second-Order Equation (Parabolic)
The data from the Conversion Table, or the equation below,
when plotted, has an umbrella-shaped parabolic curve.
V
1.1.2 The First-Order Approximation (Linear)
For a quicker approximation, although less accurate than the
second-order, over the full operating temperature range the
linear formula below can be used. Using this formula, with the
constant and slope in the following set of equations, the best-
fit V
with an approximation error less than 18 mV. V
1.1.3 First-Order Approximation (Linear) over Small
Temperature Range
For a linear approximation, a line can easily be calculated
over the desired temperature range from the Conversion Ta-
ble 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 Gain 4, over a temperature 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.
TEMP
TEMP
is in mV.
vs Die Temperature performance can be calculated
2
and V
1
and V
2
are the coordinates of the
1
are the coordinates of
TEMP
is in mV.