LM94021QBIMG/NOPB [TI]
具有多个增益模拟输出选项的汽车级 ±1.5°C 温度传感器 | DCK | 5 | -50 to 150;
| 型号： | LM94021QBIMG/NOPB |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 具有多个增益模拟输出选项的汽车级 ±1.5°C 温度传感器 | DCK | 5 | -50 to 150 温度传感 传感器 温度传感器 |
| 文件： | 总24页 (文件大小：1270K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LM94021
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SNIS138E –FEBRUARY 2005–REVISED JUNE 2013
LM94021/LM94021Q Multi-Gain Analog Temperature Sensor
Check for Samples: LM94021
1
FEATURES
DESCRIPTION
The LM94021 is a precision analog output CMOS
integrated-circuit temperature sensor that operates at
a supply voltage as low as 1.5V. While operating over
the wide temperature range of −50°C to +150°C, the
LM94021 delivers an output voltage that is inversely
2
•
LM94021Q is AEC-Q100 Grade 0 Qualified and
is Manufactured on an Automotive Grade Flow
•
•
•
Low 1.5V Operation
Four Selectable Gains
proportional
to
measured
temperature.
The
Very Accurate Over Wide Temperature Range
of −50°C to +150°C
LM94021's low supply current makes it ideal for
battery-powered systems as well as general
temperature sensing applications.
•
•
•
•
Low Quiescent Current
Output is Short-Circuit Protected
Extremely Small SC70 Package
Two logic inputs, Gain Select 1 (GS1) and Gain
Select 0 (GS0), select the gain of the temperature-to-
voltage output transfer function. Four slopes are
selectable: −5.5 mV/°C, −8.2 mV/°C, −10.9 mV/°C,
and −13.6 mV/°C. In the lowest gain configuration
(GS1 and GS0 both tied low), the LM94021 can
Footprint Compatible with the Industry-
Standard LM20 Temperature Sensor
•
UL Recognized Component
operate with
a
1.5V supply while measuring
APPLICATIONS
temperature over the full −50°C to +150°C operating
range. Tying both inputs high causes the transfer
function to have the largest gain of −13.6 mV/°C for
maximum temperature sensitivity. The gain-select
inputs can be tied directly to VDD or Ground without
any pull-up or pull-down resistors, reducing
component count and board area. These inputs can
also be driven by logic signals allowing the system to
optimize the gain during operation or system
diagnostics.
•
•
•
•
•
•
•
Cell Phones
Wireless Transceivers
Battery Management
Automotive
Disk Drives
Games
Appliances
Table 1. KEY SPECIFICATIONS
Supply Voltage
1.5V to 5.5V
Supply Current
9 μA (typ)
20°C to 40°C
−50°C to 70°C
−50°C to 90°C
−50°C to 150°C
±1.5°C
±1.8°C
±2.1°C
±2.7°C
Temperature Accuracy
Operating Temperature
–50°C to 150°C
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2013, Texas Instruments Incorporated
LM94021
SNIS138E –FEBRUARY 2005–REVISED JUNE 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
CONNECTION DIAGRAM
1
2
3
5
4
GS0
GND
OUT
GS1
LM94021
V
DD
Figure 1. 5-Pin SC70 - Top View
TYPICAL TRANSFER CHARACTERISTIC
Output Voltage vs Temperature
TYPICAL APPLICATION
Full-Range Celsius Temperature Sensor (−50°C to +150°C) operating from a Single Battery Cell
V
(+1.5V to +5.5V)
DD
V
DD
LM94021
Single Battery
Cell
GS1
OUT
GS0
GND
2
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SNIS138E –FEBRUARY 2005–REVISED JUNE 2013
PIN DESCRIPTIONS
LABEL
PIN NUMBER
TYPE
EQUIVALENT CIRCUIT
FUNCTION
Gain Select 1 - One of two inputs for
selecting the slope of the output
response
V
DD
GS1
5
Logic Input
Gain Select 0 - One of two inputs for
selecting the slope of the output
response
ESD
CLAMP
GS0
1
Logic Input
GND
V
DD
Outputs a voltage which is inversely
proportional to temperature
OUT
3
Analog Output
GND
VDD
4
2
Power
Positive Supply Voltage
Power Supply Ground
GND
Ground
(1)
ABSOLUTE MAXIMUM RATINGS
VALUES
−0.3V to +6.0V
−0.3V to (VDD + 0.5V)
±7 mA
Supply Voltage
Voltage at Output Pin
Output Current
Voltage at GS0 and GS1 Input Pins
−0.3V to +6.0V
5 mA
(2)
Input Current at any pin
Storage Temperature
−65°C to +150°C
+150°C
Maximum Junction Temperature (TJMAX
)
Human Body Model
Machine Model
2500V
(3)
ESD Susceptibility
250V
Soldering process must comply with Reflow Temperature Profile specifications. Refer to http://www.ti.com/packaging.(4)
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the
Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may
degrade when the device is not operated under the listed test conditions.
(2) When the input voltage (VI) at any pin exceeds power supplies (VI < GND or VI > V+), the current at that pin should be limited to 5 mA.
(3) The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF
capacitor discharged directly into each pin.
(4) Reflow temperature profiles are different for lead-free and non-lead-free packages.
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(1)
OPERATING RATINGS
Specified Temperature Range
TMIN ≤ TA ≤ TMAX
LM94021
−50°C ≤ TA ≤ +150°C
Supply Voltage Range (VDD
)
+1.5 V to +5.5 V
(2)(3)
Thermal Resistance (θJA
)
415°C/W
5-Pin SC70
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the
Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may
degrade when the device is not operated under the listed test conditions.
(2) The junction to ambient thermal resistance (θJA) is specified without a heat sink in still air.
(3) Changes in output due to self heating can be computed by multiplying the internal dissipation by the thermal resistance.
ACCURACY CHARACTERISTICS
These limits do not include DC load regulation. These stated accuracy limits are with reference to the values in the LM94021
Transfer Table.
UNITS
(1)
PARAMETER
CONDITIONS
LIMITS
(LIMIT)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
°C (max)
TA = +20°C to +40°C; VDD = 1.5V to 5.5V
TA = +0°C to +70°C; VDD = 1.5V to 5.5V
TA = +0°C to +90°C; VDD = 1.5V to 5.5V
TA = +0°C to +120°C; VDD = 1.5V to 5.5V
TA = +0°C to +150°C; VDD = 1.5V to 5.5V
TA = −50°C to +0°C; VDD = 1.6V to 5.5V
TA = +20°C to +40°C; VDD = 1.8V to 5.5V
TA = +0°C to +70°C; VDD = 1.9V to 5.5V
TA = +0°C to +90°C; VDD = 1.9V to 5.5V
TA = +0°C to +120°C; VDD = 1.9V to 5.5V
TA = +0°C to +150°C; VDD = 1.9V to 5.5V
TA = −50°C to +0°C; VDD = 2.3V to 5.5V
TA = +20°C to +40°C; VDD = 2.2V to 5.5V
TA = +0°C to +70°C; VDD = 2.4V to 5.5V
TA = +0°C to +90°C; VDD = 2.4V to 5.5V
TA = +0°C to +120°C; VDD = 2.4V to 5.5V
TA = +0°C to +150°C; VDD = 2.4V to 5.5V
TA = −50°C to +0°C; VDD = 3.0V to 5.5V
TA = +20°C to +40°C; VDD = 2.7V to 5.5V
TA = +0°C to +70°C; VDD = 3.0V to 5.5V
TA = +0°C to +90°C; VDD = 3.0V to 5.5V
TA = +0°C to +120°C; VDD = 3.0V to 5.5V
TA = 0°C to +150°C; VDD = 3.0V to 5.5V
TA = −50°C to +0°C; VDD = 3.6V to 5.5V
±1.5
±1.8
±2.1
±2.4
±2.7
±1.8
±1.5
±1.8
±2.1
±2.4
±2.7
±1.8
±1.5
±1.8
±2.1
±2.4
±2.7
±1.8
±1.5
±1.8
±2.1
±2.4
±2.7
±1.8
GS1 = 0
GS0 = 0
GS1 = 0
GS0 = 1
(2)
Temperature Error
GS1 = 1
GS0 = 0
GS1 = 1
GS0 = 1
(1) Limits are ensured to TI's AOQL (Average Outgoing Quality Level).
(2) Accuracy is defined as the error between the measured and reference output voltages, tabulated in the Transfer Table at the specified
conditions of supply gain setting, voltage, and temperature (expressed in °C). Accuracy limits include line regulation within the specified
conditions. Accuracy limits do not include load regulation; they assume no DC load.
4
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ELECTRICAL CHARACTERISTICS
Unless otherwise noted, these specifications apply for +VDD = +1.5V to +5.5V . Boldface limits apply for TA = TJ = TMIN to
TMAX ; all other limits TA = TJ = 25°C.
UNITS
(LIMIT)
(1)
(2)
PARAMETER
CONDITIONS
TYPICAL
LIMITS
GS1 = 0, GS0 = 0
−5.5
−8.2
−10.9
−13.6
mV/°C
mV/°C
mV/°C
mV/°C
GS1 = 0, GS1 = 1
GS1 = 1, GS0 = 0
GS1 = 1, GS0 = 1
Sensor Gain
(4)
Source ≤ 2.0 μA
Sink ≤ 100 μA
Sink = 50 μA
−1
1.6
mV (max)
mV (max)
mV
(3)
Load Regulation
0.4
200
9
(5)
Line Regulation
Supply Current
(VDD - VOUT) ≥ 200 mV
μV/V
TA = +30°C to +150°C
TA = −50°C to +150°C
12
13
μA (max)
μA (max)
IS
CL
Output Load Capacitance
1100
pF (max)
CL= 0 pF
CL=1100 pF
0.7
0.8
1.6
2.4
ms (max)
ms (max)
(6)
Power-on Time
GS1 and GS0 Input Logic "1" Threshold
Voltage
VIH
VIL
VDD- 0.5V
0.5
V (min)
V (max)
GS1 and GS0 Input Logic "0" Threshold
Voltage
(7)
IIH
IIL
Logic "1" Input Current
0.001
0.001
1
1
μA (max)
μA (max)
(7)
Logic "0" Input Current
(1) Typicals are at TJ = TA = 25°C and represent most likely parametric norm.
(2) Limits are ensured to TI's AOQL (Average Outgoing Quality Level).
(3) Source currents are flowing out of the LM94021. Sink currents are flowing into the LM94021.
(4) Assumes (VDD - VOUT) ≥ 200 mV.
(5) Line regulation is calculated by subtracting the output voltage at the highest supply voltage from the output voltage at the lowest supply
voltage. The typical line regulation specification does not include the output voltage shift discussed in Section 5.0.
(6) Specified by design.
(7) The input current is leakage only and is highest at high temperature. It is typically only 0.001 µA. The 1 µA limit is solely based on a
testing limitation and does not reflect the actual performance of the part.
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TYPICAL PERFORMANCE CHARACTERISTICS
Temperature Error vs. Temperature
Minimum Operating Temperature vs. Supply Voltage
4
3
MAX Limit
2
1
0
MIN Limit
-1
-2
-3
-4
-50 -25
0
25 50 75 100 125 150
TEMPERATURE (ºC)
Figure 2.
Figure 3.
Supply Current vs. Temperature
Supply Current vs. Supply Voltage
Figure 4.
Figure 5.
Load Regulation, Sourcing Current
Load Regulation, Sinking Current
Figure 6.
Figure 7.
6
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Change in VOUT vs. Overhead Voltage
Supply Noise Gain vs. Frequency
0
-10
-20
-30
-40
-50
V
= 5.0V
DD
TEMP = 25°C
C
= 0 pF
LOAD
C
= 100 pF
LOAD
C
= 1 nF
LOAD
-60
-70
100k
10M
100
1k
10k
1M
FREQUENCY (Hz)
Figure 8.
Figure 9.
Line Regulation: Output Voltage vs. Supply Voltage
Gain Select = 00
Line Regulation: Output Voltage vs. Supply Voltage
Gain Select = 01
Figure 10.
Figure 11.
Line Regulation: Output Voltage vs. Supply Voltage
Gain Select = 10
Line Regulation: Output Voltage vs. Supply Voltage
Gain Select = 11
Figure 12.
Figure 13.
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APPLICATION INFORMATION
LM94021 TRANSFER FUNCTION
The LM94021 has four selectable gains, each of which can be selected by the GS1 and GS0 input pins. The
output voltage for each gain, across the complete operating temperature range is shown in Table 2, below. This
table is the reference from which the LM94021 accuracy specifications (listed in the ELECTRICAL
CHARACTERISTICS section) are determined. This table can be used, for example, in a host processor look-up
table.
A
file
containing
this
data
is
available
for
download
at
http://www.ti.com/lsds/ti/analog/temperature_sensor.page.
Table 2. LM94021 Transfer Table
TEMPERATURE
(°C)
GS = 00
GS = 01
(mV)
GS = 10
GS = 11
(mV)
1299
1294
1289
1284
1278
1273
1268
1263
1257
1252
1247
1242
1236
1231
1226
1221
1215
1210
1205
1200
1194
1189
1184
1178
1173
1168
1162
1157
1152
1146
1141
1136
1130
1125
1120
1114
1109
1104
(mV)
2616
2607
2598
2589
2580
2571
2562
2553
2543
2533
2522
2512
2501
2491
2481
2470
2460
2449
2439
2429
2418
2408
2397
2387
2376
2366
2355
2345
2334
2324
2313
2302
2292
2281
2271
2260
2250
2239
(mV)
3277
3266
3254
3243
3232
3221
3210
3199
3186
3173
3160
3147
3134
3121
3108
3095
3082
3069
3056
3043
3030
3017
3004
2991
2978
2965
2952
2938
2925
2912
2899
2886
2873
2859
2846
2833
2820
2807
−50
−49
−48
−47
−46
−45
−44
−43
−42
−41
−40
−39
−38
−37
−36
-35
1955
1949
1942
1935
1928
1921
1915
1908
1900
1892
1885
1877
1869
1861
1853
1845
1838
1830
1822
1814
1806
1798
1790
1783
1775
1767
1759
1751
1743
1735
1727
1719
1711
1703
1695
1687
1679
1671
−34
−33
−32
−31
−30
−29
−28
−27
−26
−25
−24
−23
−22
−21
−20
−19
−18
−17
−16
−15
−14
−13
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Table 2. LM94021 Transfer Table (continued)
TEMPERATURE
(°C)
GS = 00
(mV)
GS = 01
(mV)
GS = 10
(mV)
GS = 11
(mV)
−12
−11
−10
−9
−8
−7
−6
−5
−4
−3
−2
−1
0
1098
1093
1088
1082
1077
1072
1066
1061
1055
1050
1044
1039
1034
1028
1023
1017
1012
1007
1001
996
1663
1656
1648
1639
1631
1623
1615
1607
1599
1591
1583
1575
1567
1559
1551
1543
1535
1527
1519
1511
1502
1494
1486
1478
1470
1462
1454
1446
1438
1430
1421
1413
1405
1397
1389
1381
1373
1365
1356
1348
1340
1332
1324
1316
1308
1299
1291
2228
2218
2207
2197
2186
2175
2164
2154
2143
2132
2122
2111
2100
2089
2079
2068
2057
2047
2036
2025
2014
2004
1993
1982
1971
1961
1950
1939
1928
1918
1907
1896
1885
1874
1864
1853
1842
1831
1820
1810
1799
1788
1777
1766
1756
1745
1734
2793
2780
2767
2754
2740
2727
2714
2700
2687
2674
2660
2647
2633
2620
2607
2593
2580
2567
2553
2540
2527
2513
2500
2486
2473
2459
2446
2433
2419
2406
2392
2379
2365
2352
2338
2325
2311
2298
2285
2271
2258
2244
2231
2217
2204
2190
2176
1
2
3
4
5
6
7
8
990
9
985
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
980
974
969
963
958
952
947
941
936
931
925
920
914
909
903
898
892
887
882
876
871
865
860
854
849
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Table 2. LM94021 Transfer Table (continued)
TEMPERATURE
(°C)
GS = 00
(mV)
GS = 01
(mV)
GS = 10
(mV)
GS = 11
(mV)
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
843
838
832
827
821
816
810
804
799
793
788
782
777
771
766
760
754
749
743
738
732
726
721
715
710
704
698
693
687
681
676
670
664
659
653
647
642
636
630
625
619
613
608
602
596
591
585
1283
1275
1267
1258
1250
1242
1234
1225
1217
1209
1201
1192
1184
1176
1167
1159
1151
1143
1134
1126
1118
1109
1101
1093
1084
1076
1067
1059
1051
1042
1034
1025
1017
1008
1000
991
1723
1712
1701
1690
1679
1668
1657
1646
1635
1624
1613
1602
1591
1580
1569
1558
1547
1536
1525
1514
1503
1492
1481
1470
1459
1448
1436
1425
1414
1403
1391
1380
1369
1358
1346
1335
1324
1313
1301
1290
1279
1268
1257
1245
1234
1223
1212
2163
2149
2136
2122
2108
2095
2081
2067
2054
2040
2026
2012
1999
1985
1971
1958
1944
1930
1916
1902
1888
1875
1861
1847
1833
1819
1805
1791
1777
1763
1749
1735
1721
1707
1693
1679
1665
1651
1637
1623
1609
1595
1581
1567
1553
1539
1525
983
974
966
957
949
941
932
924
915
907
898
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Table 2. LM94021 Transfer Table (continued)
TEMPERATURE
(°C)
GS = 00
(mV)
GS = 01
(mV)
GS = 10
(mV)
GS = 11
(mV)
82
83
579
574
568
562
557
551
545
539
534
528
522
517
511
505
499
494
488
482
476
471
465
459
453
448
442
436
430
425
419
413
407
401
396
390
384
378
372
367
361
355
349
343
337
332
326
320
314
890
881
873
865
856
848
839
831
822
814
805
797
788
779
771
762
754
745
737
728
720
711
702
694
685
677
668
660
651
642
634
625
617
608
599
591
582
573
565
556
547
539
530
521
513
504
495
1201
1189
1178
1167
1155
1144
1133
1122
1110
1099
1088
1076
1065
1054
1042
1031
1020
1008
997
1511
1497
1483
1469
1455
1441
1427
1413
1399
1385
1371
1356
1342
1328
1314
1300
1286
1272
1257
1243
1229
1215
1201
1186
1172
1158
1144
1130
1115
1101
1087
1073
1058
1044
1030
1015
1001
987
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
986
974
963
951
940
929
917
906
895
883
872
860
849
837
826
814
803
791
780
769
973
757
958
745
944
734
929
722
915
711
901
699
886
688
872
676
858
Copyright © 2005–2013, Texas Instruments Incorporated
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Table 2. LM94021 Transfer Table (continued)
TEMPERATURE
(°C)
GS = 00
(mV)
GS = 01
(mV)
GS = 10
(mV)
GS = 11
(mV)
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
308
302
296
291
285
279
273
267
261
255
249
243
237
231
225
219
213
207
201
195
189
183
487
478
469
460
452
443
434
425
416
408
399
390
381
372
363
354
346
337
328
319
310
301
665
653
642
630
618
607
595
584
572
560
549
537
525
514
502
490
479
467
455
443
432
420
843
829
814
800
786
771
757
742
728
713
699
684
670
655
640
626
611
597
582
568
553
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.
mV
mV
°C2
2
J2,G00 :VTEMP mV = 870.6mV - 5.506
T - 30°C - 0.00176
T - 30°C
(
)
(
)
(
)
°C
mV
mV
°C2
2
J3,G01 :VTEMP mV = 1324.0mV - 8.194
T - 30°C - 0.00262
T - 30°C
(
)
(
)
(
)
°C
mV
mV
°C2
2
J4,G10 :VTEMP mV = 1777.3mV - 10.888
T - 30°C - 0.00347
T - 30°C
(
)
(
)
(
)
°C
mV
°C
mV
°C2
2
J5,G11 :VTEMP mV = 2230.8mV - 13.582
T - 30°C - 0.00433
T - 30°C
(
)
(
)
(
)
(1)
For a linear approximation, a line can easily be calculated over the desired temperature range from the Table
using the two-point equation:
V2 - V1
’
◊
’
ì
V - V1 =
(T - T1)
T2 - T1
(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:
760 mV - 925 mV
o
’
◊
’
ì
V - 925 mV =
(T - 20 C)
50oC - 20oC
(3)
(4)
(5)
o
o
ì
(-5.50 mV / C) (T - 20 C)
V - 925 mV =
o
ì
(-5.50 mV / C) T + 1035 mV
V =
12
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LM94021
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Using this method of linear approximation, the transfer function can be approximated for one or more
temperature ranges of interest.
MOUNTING AND THERMAL CONDUCTIVITY
The LM94021 can be applied easily in the same way as other integrated-circuit temperature sensors. It can be
glued or cemented to a surface.
To ensure good thermal conductivity, the backside of the LM94021 die is directly attached to the GND pin (Pin
2). The temperatures of the lands and traces to the other leads of the LM94021 will also affect the temperature
reading.
Alternatively, the LM94021 can be mounted inside a sealed-end metal tube, and can then be dipped into a bath
or screwed into a threaded hole in a tank. As with any IC, the LM94021 and accompanying wiring and circuits
must be kept insulated and dry, to avoid leakage and corrosion. This is especially true if the circuit may operate
at cold temperatures where condensation can occur. If moisture creates a short circuit from the output to ground
or VDD, the output from the LM94021 will not be correct. Printed-circuit coatings are often used to ensure that
moisture cannot corrode the leads or circuit traces.
The thermal resistance junction to ambient (θJA) is the parameter used to calculate the rise of a device junction
temperature due to its power dissipation. The equation used to calculate the rise in the LM94021's die
temperature is
TJ = TA + qJA (VDDIQ) + (VDD - VO) IL
[
]
(6)
where TA is the ambient temperature, IQ is the quiescent current, IL is the load current on the output, and VO is
the output voltage. For example, in an application where TA = 30°C, VDD = 5 V, IDD = 9 μA, Gain Select = 11,
VOUT = 2.231 mV, and IL = 2 μA, the junction temperature would be 30.021°C, showing a self-heating error of
only 0.021°C. Since the LM94021's junction temperature is the actual temperature being measured, care should
be taken to minimize the load current that the LM94021 is required to drive. Table 3 shows the thermal
resistance of the LM94021.
Table 3. LM94021 Thermal Resistance
DEVICE NUMBER
PACKAGE NUMBER
THERMAL RESISTANCE (θJA)
LM94021BIMG
DCK0005A
415°C/W
NOISE CONSIDERATIONS
The LM94021 has excellent noise rejection (the ratio of the AC signal on VOUT to the AC signal on VDD). During
bench tests, sine wave rejection of −54 dB or better was observed over 200 Hz to 10 kHz; Also, −28 dB or better
was observed from 10 kHz to 1 MHz. A load capacitor on the output can help filter noise; for example, a 1 nF
load capacitor resulted in −51 dB or better from 200 Hz to 1 MHz.
There is no specific requirement for the use of a bypass capacitor close to the LM94021 because it does not
draw transient currents. For operation in very noisy environments, some bypass capacitance may be required.
The capacitance does not need to be in close proximity to the LM94021. The LM94021 has been bench tested
successfully with a bypass capacitor as far as 6 inches away. In fact, it can be powered by a properly-bypassed
logic gate.
CAPACITIVE LOADS
The LM94021 handles capacitive loading well. In an extremely noisy environment, or when driving a switched
sampling input on an ADC, it may be necessary to add some filtering to minimize noise coupling. Without any
precautions, the LM94021 can drive a capacitive load less than or equal to 1100 pF as shown in Figure 14. For
capacitive loads greater than 1100 pF, a series resistor may be required on the output, as shown in Figure 15.
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V
DD
LM94021
GND
OUT
OPTIONAL
BYPASS
C
LOAD
< 1100 pF
CAPACITANCE
Figure 14. LM94021 No Decoupling Required for Capacitive Loads Less than 1100 pF
V
DD
R
S
LM94021
GND
OUT
OPTIONAL
BYPASS
CAPACITANCE
C
LOAD
> 1100 pF
Figure 15. LM94021 with Series Resistor for Capacitive Loading greater than 1100 pF
OUTPUT VOLTAGE SHIFT
The LM94021 is very linear over temperature and supply voltage range. Due to the intrinsic behavior of an
NMOS/PMOS rail-to-rail buffer, a slight shift in the output can occur when the supply voltage is ramped over the
operating range of the device. The location of the shift is determined by the relative levels of VDD and VOUT. The
shift typically occurs when VDD- VOUT = 1.0V.
This slight shift (a few millivolts) takes place over a wide change (approximately 200 mV) in VDD or VOUT. Since
the shift takes place over a wide temperature change of 5°C to 20°C, VOUT is always monotonic. The accuracy
specifications in the ELECTRICAL CHARACTERISTICS table already include this possible shift.
SELECTABLE GAIN FOR OPTIMIZATION AND IN SITU TESTING
The Gain Select digital inputs can be tied to the rails or can be driven from digital outputs such as microcontroller
GPIO pins. In low-supply voltage applications, the ability to reduce the gain to −5.5 mV/°C allows the LM94021 to
operate over the full −50°C to 150°C range. When a larger supply voltage is present, the gain can be increased
as high as −13.6 mV/°C. The larger gain is optimal for reducing the effects of noise (for example, noise coupling
on the output line or quantization noise induced by an analog-to-digital converter which may be sampling the
LM94021 output).
Another application advantage of the digitally selectable gain is the ability to perform dynamic testing of the
LM94021 while it is running in a system. By toggling the logic levels of the gain select pins and monitoring the
resultant change in the output voltage level, the host system can verify the functionality of the LM94021.
14
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LM94021
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SNIS138E –FEBRUARY 2005–REVISED JUNE 2013
APPLICATION CIRCUITS
V
TEMP
V+
R3
V
V
T1
R4
T2
R1
V
T
(High = overtemp alarm)
4.1V
+
V
OUT
V
OUT
U1
LM4040
U3
0.1 mF
-
R2
(4.1)R2
V
V
=
=
T1
R2 + R1||R3
LM94021
V
DD
V
Temp
(4.1)R2||R3
R1 + R2||R3
T2
U2
Figure 16. Celsius Thermostat
V
DD
V
OUT
SHUTDOWN
LM94021
Any logic
device output
Figure 17. Conserving Power Dissipation with Shutdown
SAR Analog-to-Digital Converter
Reset
+1.5V to +5.5V
Input
Pin
LM94021
Sample
R
IN
4
5
3
OUT
GND
GS0
V
DD
C
BP
C
IN
C
2
FILTER
C
SAMPLE
1
GS1
Most CMOS ADCs found in microcontrollers and ASICs have a sampled data comparator input structure. When the
ADC charges the sampling cap, it requires instantaneous charge from the output of the analog source such as the
LM94021 temperature sensor and many op amps. This requirement is easily accommodated by the addition of a
capacitor (CFILTER). The size of CFILTER depends on the size of the sampling capacitor and the sampling frequency.
Since not all ADCs have identical input stages, the charge requirements will vary. This general ADC application is
shown as an example only.
Figure 18. Suggested Connection to a Sampling Analog-to-Digital Converter Input Stage
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REVISION HISTORY
Changes from Revision C (February 2013) to Revision D
Page
•
Changed layout of National Data Sheet to TI format .......................................................................................................... 15
16
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PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
(6)
LM94021BIMG/NOPB
LM94021BIMGX/NOPB
LM94021QBIMG/NOPB
LM94021QBIMGX/NOPB
ACTIVE
ACTIVE
ACTIVE
ACTIVE
SC70
SC70
SC70
SC70
DCK
DCK
DCK
DCK
5
5
5
5
1000 RoHS & Green
3000 RoHS & Green
1000 RoHS & Green
3000 RoHS & Green
SN
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
Level-1-260C-UNLIM
-50 to 150
-50 to 150
-50 to 150
-50 to 150
21B
21B
21Q
21Q
SN
SN
SN
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF LM94021, LM94021-Q1 :
Catalog: LM94021
•
Automotive: LM94021-Q1
•
NOTE: Qualified Version Definitions:
Catalog - TI's standard catalog product
•
Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects
•
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
29-Oct-2021
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
LM94021BIMG/NOPB
LM94021BIMGX/NOPB
LM94021QBIMG/NOPB
SC70
SC70
SC70
DCK
DCK
DCK
DCK
5
5
5
5
1000
3000
1000
3000
178.0
178.0
178.0
178.0
8.4
8.4
8.4
8.4
2.25
2.25
2.25
2.25
2.45
2.45
2.45
2.45
1.2
1.2
1.2
1.2
4.0
4.0
4.0
4.0
8.0
8.0
8.0
8.0
Q3
Q3
Q3
Q3
LM94021QBIMGX/NOPB SC70
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
29-Oct-2021
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
LM94021BIMG/NOPB
LM94021BIMGX/NOPB
LM94021QBIMG/NOPB
LM94021QBIMGX/NOPB
SC70
SC70
SC70
SC70
DCK
DCK
DCK
DCK
5
5
5
5
1000
3000
1000
3000
208.0
208.0
208.0
208.0
191.0
191.0
191.0
191.0
35.0
35.0
35.0
35.0
Pack Materials-Page 2
PACKAGE OUTLINE
DCK0005A
SOT - 1.1 max height
S
C
A
L
E
5
.
6
0
0
SMALL OUTLINE TRANSISTOR
C
2.4
1.8
0.1 C
1.4
1.1
B
1.1 MAX
A
PIN 1
INDEX AREA
1
2
5
NOTE 4
(0.15)
(0.1)
2X 0.65
1.3
2.15
1.85
1.3
4
3
0.33
5X
0.23
0.1
0.0
(0.9)
TYP
0.1
C A B
0.15
0.22
0.08
GAGE PLANE
TYP
0.46
0.26
8
0
TYP
TYP
SEATING PLANE
4214834/C 03/2023
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Refernce JEDEC MO-203.
4. Support pin may differ or may not be present.
www.ti.com
EXAMPLE BOARD LAYOUT
DCK0005A
SOT - 1.1 max height
SMALL OUTLINE TRANSISTOR
PKG
5X (0.95)
1
5
5X (0.4)
SYMM
(1.3)
2
3
2X (0.65)
4
(R0.05) TYP
(2.2)
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE:18X
SOLDER MASK
OPENING
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
METAL
EXPOSED METAL
EXPOSED METAL
0.07 MIN
ARROUND
0.07 MAX
ARROUND
NON SOLDER MASK
DEFINED
SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
4214834/C 03/2023
NOTES: (continued)
4. Publication IPC-7351 may have alternate designs.
5. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
www.ti.com
EXAMPLE STENCIL DESIGN
DCK0005A
SOT - 1.1 max height
SMALL OUTLINE TRANSISTOR
PKG
5X (0.95)
1
5
5X (0.4)
SYMM
(1.3)
2
3
2X(0.65)
4
(R0.05) TYP
(2.2)
SOLDER PASTE EXAMPLE
BASED ON 0.125 THICK STENCIL
SCALE:18X
4214834/C 03/2023
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
7. Board assembly site may have different recommendations for stencil design.
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Copyright © 2023, Texas Instruments Incorporated
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