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LM94022, LM94022-Q1
SNIS140F – MAY 2006 – REVISED SEPTEMBER 2015
LM94022/-Q1 1.5-V, SC70, Multi-Gain Analog Temperature Sensor With Class-AB Output
1 Features
3 Description
•
The LM94022/-Q1 device is a precision analog output
CMOS integrated-circuit temperature sensor with
selectable linear negative temperature coefficient
(NTC). A class-AB output structure gives the
LM94022/-Q1 strong output source and sink current
capability for driving heavy transient loads such as
that presented by the input of a sample-and-hold
analog-to-digital converter. The low 5.4-µA supply
current and 1.5-V operating voltage of the LM94022/Q1 make it ideal for battery-powered systems as well
as general temperature-sensing applications.
1
•
•
•
•
•
•
•
•
LM94022/-Q1 is AEC-Q100 Grade 0 qualified and
is Manufactured on an Automotive Grade Flow
Low 1.5-V to 5.5-V Operation With Low 5.4-µA
Supply Current
Push-Pull Output With ±50-µA Source Current
Capability
Four Selectable Gains
Very Accurate Over Wide Temperature Range of
−50°C to +150°C:
– ±1.5ºC Temperature Accuracy for 20ºC to
40ºC Range
– ±1.8ºC Temperature Accuracy for –50ºC to
70ºC Range
– ±2.1ºC Temperature Accuracy for –50ºC to
90ºC Range
– ±2.7ºC Temperature Accuracy for –50ºC to
150ºC Range
Output is Short-Circuit Protected
Extremely Small SC70 Package
For the Similar Functionality in a TO-92 Package,
See LMT84, LMT85, LMT86, or LMT87
Footprint Compatible With the Industry-Standard
LM20 Temperature Sensor
2 Applications
•
•
•
•
•
•
•
The Gain Select 1 (GS1) and Gain Select 0 (GS0)
logic inputs select one of four gains for the
temperature-to-voltage output transfer function: −5.5
mV/°C, −8.2 mV/°C, −10.9 mV/°C, and −13.6 mV/°C.
Selecting –5.5 mV/°C (GS1 and GS0 both tied low),
allows the LM94022/-Q1 to operate down to 1.5-V
supply while measuring temperature over the full
range of −50°C to +150°C. Maximum temperature
sensitivity, –13.6 mV/°C, is selected when GS1 and
GS0 are both tied high. The gain-select inputs can be
tied directly to VDD or Ground without any pullup or
pulldown 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.
Device Information(1)
PART NUMBER
LM94022
Automotive
Cell Phones
Wireless Transceivers
Battery Management
Disk Drives
Games
Appliances
LM94022-Q1
PACKAGE
SC70 (5)
BODY SIZE (NOM)
2.00 mm × 1.25 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Full-Range Celsius Temperature Sensor (–50°C to
+150°C) Operating from a Single Cell Battery
Output Temperature Characteristic
VDD (+1.5V to +5.5V)
VDD
Single Battery
Cell
LM94022
GS1
OUT
GS0
GND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LM94022, LM94022-Q1
SNIS140F – MAY 2006 – REVISED SEPTEMBER 2015
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
4
6.1
6.2
6.3
6.4
6.5
6.6
4
4
4
4
5
7
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics ..........................................
Typical Characteristics ..............................................
Detailed Description .............................................. 9
7.1
7.2
7.3
7.4
Overview ................................................................... 9
Functional Block Diagram ......................................... 9
Feature Description................................................... 9
Device Functional Modes........................................ 14
8
Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Application ................................................. 17
8.3 System Examples ................................................... 18
9 Power Supply Recommendations...................... 19
10 Layout................................................................... 19
10.1 Layout Guidelines ................................................. 19
10.2 Layout Example .................................................... 20
10.3 Output and Noise Considerations ......................... 20
11 Device and Documentation Support ................. 21
11.1
11.2
11.3
11.4
11.5
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
21
21
21
21
21
12 Mechanical, Packaging, and Orderable
Information ........................................................... 21
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision E (June 2013) to Revision F
•
Page
Added or changed: Pin Configuration and Functions section, ESD Ratings table, Feature Description section,
Device Functional Modes, Application and Implementation section, Power Supply Recommendations section,
Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information
section ................................................................................................................................................................................... 1
Changes from Revision D (February 2013) to Revision E
•
Page
added parabolic equation for LM94022/-Q1 .......................................................................................................................... 1
Changes from Revision C (May 2005) to Revision D
•
2
Page
Changed layout of National Data Sheet to TI format ........................................................................................................... 17
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Product Folder Links: LM94022 LM94022-Q1
LM94022, LM94022-Q1
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SNIS140F – MAY 2006 – REVISED SEPTEMBER 2015
5 Pin Configuration and Functions
DCK Package
5-Pin SC70
Top View
1
5
GS0
GS1
2
LM94022
GND
3
4
OUT
VDD
Pin Functions
PIN
NAME
NO.
TYPE
EQUIVALENT CIRCUIT
FUNCTION
VDD
GS1
5
Gain Select 1 - One of two logic inputs for selecting
the slope of the output response
Logic Input
ESD
CLAMP
GND
GS0
1
Gain Select 0 - One of two logic inputs for selecting
the slope of the output response
Logic Input
VDD
Outputs a voltage which is inversely proportional to
temperature
OUT
3
Analog Output
VDD
4
Power
—
Positive Supply Voltage
GND
2
Ground
—
Power Supply Ground
GND
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Product Folder Links: LM94022 LM94022-Q1
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SNIS140F – MAY 2006 – REVISED SEPTEMBER 2015
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1) (2)
MIN
MAX
UNIT
Supply Voltage
−0.3
6
V
Voltage at Output Pin
−0.3
(VDD + 0.5)
V
±7
mA
6
V
Output Current
−0.3
Voltage at GS0 and GS1 Input Pins
Input Current at any pin
(3)
Maximum Junction Temperature, TJMAX
−65
Storage temperature, Tstg
(1)
(2)
(3)
5
mA
150
°C
150
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Soldering process must comply with Reflow Temperature Profile specifications. Refer to http://www.ti.com/packaging
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.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Human body model (HBM)
Electrostatic discharge
(1) (2)
±2500
Machine model (2)
±250
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
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.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted) (1)
Free Air or Specified Temperature
(TMIN ≤ TA ≤ TMAX)
Supply Voltage (VDD)
(1)
MIN
MAX
UNIT
−50
150
°C
1.5
5.5
V
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 guarantee specific performance limits. For guaranteed specifications and test conditions, see
the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics
may degrade when the device is not operated under the listed test conditions.
6.4 Thermal Information
LM94022, LM94022-Q1
THERMAL METRIC (1)
DCK (SC70)
UNIT
5 PINS
RθJA
(1)
4
Junction-to-ambient thermal resistance
415
°C/W
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
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SNIS140F – MAY 2006 – REVISED SEPTEMBER 2015
6.5 Electrical Characteristics
Unless otherwise noted, these specifications apply for VDD = 1.5 V to 5.5 V; all limits TA = TJ = 25°C unless otherwise
specified. These limits do not include DC load regulation. These stated accuracy limits are with reference to the values in the
Table 2.
PARAMETER
CONDITIONS
MIN
TYP (1)
MAX (2)
UNIT
ACCURACY CHARACTERISTICS
GS1 = 0
GS0 = 0
GS1 = 0
GS0 = 1
Temperature Error
(3)
GS1 = 1
GS0 = 0
GS1 = 1
GS0 = 1
(1)
(2)
(3)
TA = +20°C to +40°C;
VDD = 1.5 V to 5.5 V
–1.5
1.5
TA = +0°C to +70°C;
VDD = 1.5 V to 5.5 V
–1.8
1.8
TA = +0°C to +90°C;
VDD = 1.5 V to 5.5 V
–2.1
2.1
TA = +0°C to +120°C;
VDD = 1.5 V to 5.5 V
–2.4
2.4
TA = +0°C to +150°C;
VDD = 1.5 V to 5.5 V
–2.7
2.7
TA = −50°C to +0°C;
VDD = 1.6 V to 5.5 V
–1.8
1.8
TA = +20°C to +40°C;
VDD = 1.8 V to 5.5 V
–1.5
1.5
TA = +0°C to +70°C;
VDD = 1.9 V to 5.5 V
–1.8
1.8
TA = +0°C to +90°C;
VDD = 1.9 V to 5.5 V
–2.1
2.1
TA = +0°C to +120°C;
VDD = 1.9 V to 5.5 V
–2.4
2.4
TA = +0°C to +150°C;
VDD = 1.9 V to 5.5 V
–2.7
2.7
TA = −50°C to +0°C;
VDD = 2.3 V to 5.5 V
–1.8
1.8
TA = +20°C to +40°C;
VDD = 2.2 V to 5.5 V
–1.5
1.5
TA = +0°C to +70°C;
VDD = 2.4 V to 5.5 V
–1.8
1.8
TA = +0°C to +90°C;
VDD = 2.4 V to 5.5 V
–2.1
2.1
TA = +0°C to +120°C;
VDD = 2.4 V to 5.5 V
–2.4
2.4
TA = +0°C to +150°C;
VDD = 2.4 V to 5.5 V
–2.7
2.7
TA = −50°C to +0°C;
VDD = 3.0 V to 5.5 V
–1.8
1.8
TA = +20°C to +40°C;
VDD = 2.7 V to 5.5 V
–1.5
1.5
TA = +0°C to +70°C;
VDD = 3.0 V to 5.5 V
–1.8
1.8
TA = +0°C to +90°C;
VDD = 3.0 V to 5.5 V
–2.1
2.1
TA = +0°C to +120°C;
VDD = 3.0 V to 5.5 V
–2.4
2.4
TA = 0°C to +150°C;
VDD = 3.0 V to 5.5 V
–2.7
2.7
TA = −50°C to +0°C;
VDD = 3.6 V to 5.5 V
–1.8
1.8
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
°C
Typicals are at TJ = TA = 25°C and represent most likely parametric norm.
Limits are warrantied to TI's AOQL (Average Outgoing Quality Level).
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.
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SNIS140F – MAY 2006 – REVISED SEPTEMBER 2015
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Electrical Characteristics (continued)
Unless otherwise noted, these specifications apply for VDD = 1.5 V to 5.5 V; all limits TA = TJ = 25°C unless otherwise
specified. These limits do not include DC load regulation. These stated accuracy limits are with reference to the values in the
Table 2.
PARAMETER
Sensor Gain
Load Regulation
(4)
CONDITIONS
MIN
mV/°C
GS1 = 0, GS0 = 1
–8.2
mV/°C
GS1 = 1, GS0 = 0
–10.9
mV/°C
GS1 = 1, GS0 = 1
–13.6
mV/°C
Source ≤ 50 μA,
(VDD – VOUT) ≥ 200 mV
–0.22
TA = TJ = TMIN to TMAX
Sink ≤ 50 μA,
VOUT ≥ 200 mV
TA = TJ = TMIN to TMAX
–1
0.26
1
Supply Current
5.4
TA = TJ = TMIN to TMAX
9
1100
CL= 0 pF to 1100 pF
VIH
GS1 and GS0 Input Logic
1 Threshold Voltage
TA = TJ = TMIN to TMAX
VIL
GS1 and GS0 Input Logic
0 Threshold Voltage
TA = TJ = TMIN to TMAX
IIH
Logic 1 Input Current (7)
IIL
Logic 0 Input Current (7)
6
8.1
Output Load Capacitance
Power-ON Time (6)
(6)
(7)
5.4
TA = TJ = +30°C to +150°C
1.9
VDD – 0.5
μA
μA
ms
V
0.5
0.001
TA = TJ = TMIN to TMAX
1
0.001
TA = TJ = TMIN to TMAX
mV
pF
0.7
TA = TJ = TMIN to TMAX
mV
μV/V
200
(VDD – VOUT) ≥ 100 mV
(4)
(5)
UNIT
–5.5
(VDD – VOUT) ≥ 100 mV
CL
MAX (2)
GS1 = 0, GS0 = 0
Line Regulation (5)
IS
TYP (1)
1
V
μA
μA
Source currents are flowing out of the LM94022/-Q1. Sink currents are flowing into the LM94022/-Q1.
Line regulation (DC) is calculated by subtracting the output voltage at the highest supply voltage from the output voltage at the lowest
supply voltage. The typical DC line regulation specification does not include the output voltage shift discussed in Output Voltage Shift.
Warrantied by design and characterization.
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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SNIS140F – MAY 2006 – REVISED SEPTEMBER 2015
6.6 Typical Characteristics
4
MAX Limit
TEMPERATURE ERROR (ºC)
3
2
1
0
MIN Limit
-1
-2
-3
-4
-50
-25
0
25
50
75
100 125 150
TEMPERATURE (ºC)
Figure 1. Temperature Error vs. Temperature
Figure 2. Minimum Operating Temperature vs. Supply
Voltage
Figure 3. Supply Current vs. Temperature
Figure 4. Supply Current vs. Supply Voltage
Figure 5. Load Regulation, Sourcing Current
Figure 6. Load Regulation, Sinking Current
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SNIS140F – MAY 2006 – REVISED SEPTEMBER 2015
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Typical Characteristics (continued)
8
Figure 7. Change in Vout vs. Overhead Voltage
Figure 8. Supply-Noise Gain vs. Frequency
Figure 9. Output Voltage vs. Supply Voltage
Gain Select = 00
Figure 10. Output Voltage vs. Supply Voltage
Gain Select = 01
Figure 11. Output Voltage vs. Supply Voltage
Gain Select = 10
Figure 12. Output Voltage vs. Supply Voltage
Gain Select = 11
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SNIS140F – MAY 2006 – REVISED SEPTEMBER 2015
7 Detailed Description
7.1 Overview
The LM94022/-Q1 is an analog output temperature sensor with a selectable negative temperature coefficient
output (NTC). The temperature-sensing element is comprised of stacked transistor base emitter junctions
(thermal diodes) that are forward biased by a current source. The number of stacked thermal diodes determines
the output gain or slope. The gain select pins (GS1 and GS0) are simple logic inputs that control the number of
stacked thermal diodes thus selecting the output gain as shown in the Table 1 table. The temperature sensing
element is buffered by a simple amplifier that drives the output pin. The simple class AB output stage of the
amplifier can source or sink current and provides low-impedance, high-current drive.
Table 1. Gain Select Pin Function
GS1 LOGIC
LEVEL
GS0 LOGIC
LEVEL
SELECTED AVERAGE GAIN
0
0
–5.5 mV/°C
0
1
–8.2 mV/°C
1
0
–10.9 mV/°C
1
1
–13.6 mV/°C
7.2 Functional Block Diagram
VDD
LM94022
OUT
Thermal Diodes
GS1
Gain Select
Logic
GS0
GND
7.3 Feature Description
7.3.1 LM94022/-Q1 Transfer Function Gain Selection
The LM94022/-Q1 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. This table is
the reference from which the LM94022/-Q1 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 LM94022 product folder under Tools and Software.
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Table 2. LM94022/LM94022-Q1 Transfer Table
10
TEMPERATURE
(°C)
GS = 00
(mV)
GS = 01
(mV)
GS = 10
(mV)
GS = 11
(mV)
–50
1299
1955
2616
3277
–49
1294
1949
2607
3266
–48
1289
1942
2598
3254
–47
1284
1935
2589
3243
–46
1278
1928
2580
3232
–45
1273
1921
2571
3221
–44
1268
1915
2562
3210
–43
1263
1908
2553
3199
–42
1257
1900
2543
3186
–41
1252
1892
2533
3173
–40
1247
1885
2522
3160
–39
1242
1877
2512
3147
–38
1236
1869
2501
3134
–37
1231
1861
2491
3121
–36
1226
1853
2481
3108
–35
1221
1845
2470
3095
–34
1215
1838
2460
3082
–33
1210
1830
2449
3069
–32
1205
1822
2439
3056
–31
1200
1814
2429
3043
–30
1194
1806
2418
3030
–29
1189
1798
2408
3017
–28
1184
1790
2397
3004
–27
1178
1783
2387
2991
–26
1173
1775
2376
2978
–25
1168
1767
2366
2965
–24
1162
1759
2355
2952
–23
1157
1751
2345
2938
–22
1152
1743
2334
2925
–21
1146
1735
2324
2912
–20
1141
1727
2313
2899
–19
1136
1719
2302
2886
–18
1130
1711
2292
2873
–17
1125
1703
2281
2859
–16
1120
1695
2271
2846
–15
1114
1687
2260
2833
–14
1109
1679
2250
2820
–13
1104
1671
2239
2807
–12
1098
1663
2228
2793
–11
1093
1656
2218
2780
–10
1088
1648
2207
2767
–9
1082
1639
2197
2754
–8
1077
1631
2186
2740
–7
1072
1623
2175
2727
–6
1066
1615
2164
2714
–5
1061
1607
2154
2700
–4
1055
1599
2143
2687
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Table 2. LM94022/LM94022-Q1 Transfer Table (continued)
TEMPERATURE
(°C)
GS = 00
(mV)
GS = 01
(mV)
GS = 10
(mV)
GS = 11
(mV)
–3
1050
1591
2132
2674
–2
1044
1583
2122
2660
–1
1039
1575
2111
2647
0
1034
1567
2100
2633
1
1028
1559
2089
2620
2
1023
1551
2079
2607
3
1017
1543
2068
2593
4
1012
1535
2057
2580
5
1007
1527
2047
2567
6
1001
1519
2036
2553
7
996
1511
2025
2540
8
990
1502
2014
2527
9
985
1494
2004
2513
10
980
1486
1993
2500
11
974
1478
1982
2486
12
969
1470
1971
2473
13
963
1462
1961
2459
14
958
1454
1950
2446
15
952
1446
1939
2433
16
947
1438
1928
2419
17
941
1430
1918
2406
18
936
1421
1907
2392
19
931
1413
1896
2379
20
925
1405
1885
2365
21
920
1397
1874
2352
22
914
1389
1864
2338
23
909
1381
1853
2325
24
903
1373
1842
2311
25
898
1365
1831
2298
26
892
1356
1820
2285
27
887
1348
1810
2271
28
882
1340
1799
2258
29
876
1332
1788
2244
30
871
1324
1777
2231
31
865
1316
1766
2217
32
860
1308
1756
2204
33
854
1299
1745
2190
34
849
1291
1734
2176
35
843
1283
1723
2163
36
838
1275
1712
2149
37
832
1267
1701
2136
38
827
1258
1690
2122
39
821
1250
1679
2108
40
816
1242
1668
2095
41
810
1234
1657
2081
42
804
1225
1646
2067
43
799
1217
1635
2054
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Table 2. LM94022/LM94022-Q1 Transfer Table (continued)
12
TEMPERATURE
(°C)
GS = 00
(mV)
GS = 01
(mV)
GS = 10
(mV)
GS = 11
(mV)
44
793
1209
1624
2040
45
788
1201
1613
2026
46
782
1192
1602
2012
47
777
1184
1591
1999
48
771
1176
1580
1985
49
766
1167
1569
1971
50
760
1159
1558
1958
51
754
1151
1547
1944
52
749
1143
1536
1930
53
743
1134
1525
1916
54
738
1126
1514
1902
55
732
1118
1503
1888
56
726
1109
1492
1875
57
721
1101
1481
1861
58
715
1093
1470
1847
59
710
1084
1459
1833
60
704
1076
1448
1819
61
698
1067
1436
1805
62
693
1059
1425
1791
63
687
1051
1414
1777
64
681
1042
1403
1763
65
676
1034
1391
1749
66
670
1025
1380
1735
67
664
1017
1369
1721
68
659
1008
1358
1707
69
653
1000
1346
1693
70
647
991
1335
1679
71
642
983
1324
1665
72
636
974
1313
1651
73
630
966
1301
1637
74
625
957
1290
1623
75
619
949
1279
1609
76
613
941
1268
1595
77
608
932
1257
1581
78
602
924
1245
1567
79
596
915
1234
1553
80
591
907
1223
1539
81
585
898
1212
1525
82
579
890
1201
1511
83
574
881
1189
1497
84
568
873
1178
1483
85
562
865
1167
1469
86
557
856
1155
1455
87
551
848
1144
1441
88
545
839
1133
1427
89
539
831
1122
1413
90
534
822
1110
1399
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Table 2. LM94022/LM94022-Q1 Transfer Table (continued)
TEMPERATURE
(°C)
GS = 00
(mV)
GS = 01
(mV)
GS = 10
(mV)
GS = 11
(mV)
91
528
814
1099
1385
92
522
805
1088
1371
93
517
797
1076
1356
94
511
788
1065
1342
95
505
779
1054
1328
96
499
771
1042
1314
97
494
762
1031
1300
98
488
754
1020
1286
99
482
745
1008
1272
100
476
737
997
1257
101
471
728
986
1243
102
465
720
974
1229
103
459
711
963
1215
104
453
702
951
1201
105
448
694
940
1186
106
442
685
929
1172
107
436
677
917
1158
108
430
668
906
1144
109
425
660
895
1130
110
419
651
883
1115
111
413
642
872
1101
112
407
634
860
1087
113
401
625
849
1073
114
396
617
837
1058
115
390
608
826
1044
116
384
599
814
1030
117
378
591
803
1015
118
372
582
791
1001
119
367
573
780
987
120
361
565
769
973
121
355
556
757
958
122
349
547
745
944
123
343
539
734
929
124
337
530
722
915
125
332
521
711
901
126
326
513
699
886
127
320
504
688
872
128
314
495
676
858
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
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Table 2. LM94022/LM94022-Q1 Transfer Table (continued)
TEMPERATURE
(°C)
GS = 00
(mV)
GS = 01
(mV)
GS = 10
(mV)
GS = 11
(mV)
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
7.4 Device Functional Modes
7.4.1 Capacitive Loads
The LM94022/-Q1 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 LM94022/-Q1 can drive a capacitive load less than or equal to 1100 pF as shown in
Figure 13. For capacitive loads greater than 1100 pF, a series resistor may be required on the output, as shown
in Figure 14.
VDD
LM94022
OPTIONAL
BYPASS
CAPACITANCE
OUT
GND
CLOAD < 1100 pF
Figure 13. LM94022/-Q1 No Decoupling Required for Capacitive Loads Less than 1100 pF
VDD
RS
LM94022
OPTIONAL
BYPASS
CAPACITANCE
OUT
GND
CLOAD > 1100 pF
Figure 14. LM94022/-Q1 With Series Resistor for Capacitive Loading Greater than 1100 pF
CLOAD
14
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MINIMUM RS
1.1 nF to 99 nF
3 kΩ
100 nF to 999 nF
1.5 kΩ
1 μF
800 Ω
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7.4.2 Output Voltage Shift
The LM94022/-Q1 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 V.
This slight shift (a few mV) takes place over a wide change (approximately 200 mV) in VDD or VOUT. Because 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.
7.4.3 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 LM94022/Q1 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 LM94022/-Q1 output).
Another application advantage of the digitally selectable gain is the ability to perform dynamic testing of the
LM94022/-Q1 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 LM94022/-Q1.
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LM94022/-Q1 features make it suitable for many general temperature sensing applications. It can operate
over a supply range of 1.5 V to 5.5 V with programmable output slope and a wide –50°C to +150°C temperature
range, thus allowing flexibility for different temperature and supply voltage range combinations.
8.1.1 LM94022 Transfer Function
The LM94022 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. This table is
the reference from which the LM94022 accuracy specifications (listed in the Electrical Characteristics section) are
determined.
Although the LM94022 transfer curves are very linear, they do have a slight umbrella parabolic shape. This
shape is very accurately reflected in Table 2. The transfer table was used to calculate the following equations.
mV
mV
J2,G00 : VTEMP mV = 870.6mV - 5.506
T - 30°C - 0.00176 2 T - 30°C 2
°C
°C
mV
mV
J3,G01 : VTEMP mV = 1324.0mV - 8.194
T - 30°C - 0.00262 2 T - 30°C 2
°C
°C
mV
mV
J4,G10 : VTEMP mV = 1777.3mV - 10.888
T - 30°C - 0.00347 2 T - 30°C 2
°C
°C
mV
mV
J5,G11 : VTEMP mV = 2230.8mV - 13.582
T - 30°C - 0.00433 2 T - 30°C 2
°C
°C
(1)
A linear approximation can be useful over a narrow temperature range. A line can easily be calculated over the
desired temperature range from the table using the two-point equation:
·
¹
V - V1 =
V2 - V1
T2 - T1
· u (T - T1)
¹
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.
(2)
For example, 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, proceed as follows:
760 mV - 925 mV ·
u (T - 20oC)
50oC - 20oC ¹
·
¹
V - 925 mV =
(3)
o
o
V - 925 mV = (-5.50 mV / C) u (T - 20 C)
(4)
o
V = (-5.50 mV / C) u T + 1035 mV
(5)
Using this method of linear approximation, the transfer function can be approximated for one or more
temperature ranges of interest. The accuracy will suffer slightly in favor of easy conversion of the output voltage
to temperature.
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8.2 Typical Application
SAR Analog-to-Digital Converter
Reset
+1.5V to +5.5V
Input
Pin
LM94022
4
VDD
OUT
3
CBP
GND
5
GS1
GS0
2
CFILTER
Sample
RIN
CIN
CSAMPLE
1
Figure 15. Suggested Connection to a Sampling Analog-to-Digital Converter Input Stage
8.2.1 Design Requirements
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 LM94022/-Q1 temperature sensor and many op amps. This requirement is easily accommodated by the
addition of a capacitor CFILTER).
8.2.2 Detailed Design Procedure
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.
8.2.3 Application Curve
Figure 16. Programmable Analog Output Transfer Function
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8.3 System Examples
8.3.1 Application Circuits
VDD (+1.5V to +5.5V)
VDD
Single Battery
Cell
LM94022
GS1
OUT
GS0
GND
Figure 17. Full-Range Celsius Temperature Sensor (−50°C to +150°C) Operating from a Single Battery
Cell
V+
VTEMP
R3
VT1
R4
VT2
LM4040
VDD
VT
R1
4.1V
U3
0.1 PF
LM94022
R2
(High = overtemp alarm)
+
U1
-
VOUT
VOUT
VTemp
U2
VT1 =
(4.1)R2
R1 + R2||R3
VT2 =
(4.1)R2
R2 + R1||R3
Figure 18. Celsius Thermostat
VDD
SHUTDOWN
VOUT
LM94022
Any logic
device output
Figure 19. Conserving Power Dissipation With Shutdown
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9 Power Supply Recommendations
The LM94022/-Q1 low supply current and supply range of 1.5 V to 5.5 V allow the device to easily be powered
from many sources.
Power supply bypassing is optional and is mainly dependent on the noise on the power supply. In noisy systems
it may be necessary to add bypass capacitors to the lower the noise that couples to the output of the LM94022/Q1.
10 Layout
10.1 Layout Guidelines
10.1.1 Mounting and Thermal Conductivity
The LM94022/-Q1 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 LM94022/-Q1 die is directly attached to the GND pin
(Pin 2). The temperatures of the lands and traces to the other leads of the LM94022/-Q1 will also affect the
temperature reading.
Alternatively, the LM94022/-Q1 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 LM94022/-Q1 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 LM94022/-Q1 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 die temperature of the
LM94022/-Q1 is:
[
TJ = TA + TJA (VDDIQ) + (VDD - VO) IL
]
where
•
•
•
•
TA is the ambient temperature,
IQ is the quiescent current,
ILis the load current on the output,
and VO is the output voltage.
(6)
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. Because
the junction temperature of the LM94022 is the actual temperature being measured, take care to minimize the
load current that the LM94022/-Q1 is required to drive. Table 3 shows the thermal resistance of the LM94022/Q1.
Table 3. LM94022/LM94022-Q1 Thermal Resistance
DEVICE NUMBER
NS PACKAGE NUMBER
THERMAL RESISTANCE (θJA)
LM94022BIMG
DCK0005A
415°C/W
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10.2 Layout Example
The LM94022/-Q1 is extremely simple to layout electrically. If a power supply bypass capacitor is used it should
be connected as shown in Figure 20. The device pins and layout greatly influence the temperature that the
LM94022/-Q1 die is measuring thus thermal modeling is recommended to ensure that the device is sensing the
proper temperature.
VIA to ground plane
VIA to power plane
VIA to power plane or ground plane
GS0
GS1
GND
OUT
VDD
0.01µ F
Figure 20. Recommended Layout
10.3 Output and Noise Considerations
A push-pull output gives the LM94022/-Q1 the ability to sink and source significant current. This is beneficial
when, for example, driving dynamic loads like an input stage on an analog-to-digital converter (ADC). In these
applications the source current is required to quickly charge the input capacitor of the ADC. See the Application
Circuits section for more discussion of this topic. The LM94022/-Q1 is ideal for this and other applications which
require strong source or sink current.
The supply-noise gain of the LM94022 (the ratio of the AC signal on VOUT to the AC signal on VDD) was
measured during bench tests. It is typical attenuation is shown in the Typical Characteristics section. A load
capacitor on the output can help to filter noise.
For operation in very noisy environments, some bypass capacitance should be present on the supply within
approximately 2 inches of the LM94022/-Q1.
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11 Device and Documentation Support
11.1 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to sample or buy.
Table 4. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
LM94022
Click here
Click here
Click here
Click here
Click here
LM94022-Q1
Click here
Click here
Click here
Click here
Click here
11.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.4 Electrostatic Discharge Caution
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.
11.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
www.ti.com
30-Sep-2021
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
LM94022BIMG
NRND
SC70
DCK
5
1000
Non-RoHS
& Green
Call TI
Level-1-260C-UNLIM
-50 to 150
22B
LM94022BIMG/NOPB
ACTIVE
SC70
DCK
5
1000
RoHS & Green
SN
Level-1-260C-UNLIM
-50 to 150
22B
LM94022BIMGX/NOPB
ACTIVE
SC70
DCK
5
3000
RoHS & Green
SN
Level-1-260C-UNLIM
-50 to 150
22B
LM94022QBIMG/NOPB
ACTIVE
SC70
DCK
5
1000
RoHS & Green
SN
Level-1-260C-UNLIM
-50 to 150
22Q
LM94022QBIMGX/NOPB
ACTIVE
SC70
DCK
5
3000
RoHS & Green
SN
Level-1-260C-UNLIM
-50 to 150
22Q
(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
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