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  • LMT85 1.8、SC70/TO-92/TO-92S 模拟温度传感器

    • ZHCSCG0E March   2013  – October 2017 LMT85

      PRODUCTION DATA.  

  • CONTENTS
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  • LMT85 1.8、SC70/TO-92/TO-92S 模拟温度传感器
  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Device Comparison Tables
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Accuracy Characteristics
    6. 7.6 Electrical Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 LMT85 Transfer Function
    4. 8.4 Device Functional Modes
      1. 8.4.1 Mounting and Thermal Conductivity
      2. 8.4.2 Output and Noise Considerations
      3. 8.4.3 Capacitive Loads
      4. 8.4.4 Output Voltage Shift
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Connection to an ADC
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
        3. 9.2.1.3 Application Curve
      2. 9.2.2 Conserving Power Dissipation With Shutdown
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
        3. 9.2.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 接收文档更新通知
    2. 12.2 社区资源
    3. 12.3 商标
    4. 12.4 静电放电警告
    5. 12.5 Glossary
  13. 13机械、封装和可订购信息
  14. 重要声明
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DATA SHEET

LMT85 1.8、SC70/TO-92/TO-92S 模拟温度传感器

本资源的原文使用英文撰写。 为方便起见,TI 提供了译文;由于翻译过程中可能使用了自动化工具,TI 不保证译文的准确性。 为确认准确性,请务必访问 ti.com 参考最新的英文版本(控制文档)。

1 特性

  • LMT85LPG(TO-92S 封装)具有快速热时间常量,典型值为 10s(气流速度为 1.2m/s)
  • 非常精确:典型值 ±0.4°C
  • 1.8V 低压运行
  • -8.2mV/°C 的平均传感器增益
  • 5.4µA 低静态电流
  • 宽温度范围:–50°C 至 150°C
  • 输出受到短路保护
  • 具有 ±50µA 驱动能力的推挽输出
  • 封装尺寸兼容符合行业标准的 LM20/19 和 LM35 温度传感器
  • 具有成本优势的热敏电阻替代产品

2 应用

  • 汽车
  • 信息娱乐系统与仪表组
  • 动力传动系统
  • 烟雾和热量探测器
  • 无人机
  • 电器

3 说明

LMT85 是一款高精度 CMOS 温度传感器,其典型精度为 ±0.4°C(最大值为 ±2.7°C),且线性模拟输出电压与温度成反比关系。1.8V 工作电源电压、5.4μA 静态电流和 0.7ms 开通时间可实现有效的功率循环架构,以最大限度地降低无人机和传感器节点等电池供电 应用 的功耗。LMT85LPG 穿孔 TO-92S 封装快速热时间常量支持非板载时间温度敏感型 应用, 例如烟雾和热量探测器。 得益于宽工作范围内的精度和其他 特性, 使得 LMT85 成为热敏电阻的优质替代产品。

对于具有不同平均传感器增益和类似精度的器件,请参阅 类似替代器件 了解 LMT8x 系列中的替代器件。

器件信息(1)

器件型号 封装 封装尺寸(标称值)
LMT85 SOT (5) 2.00mm × 1.25mm
TO-92 (3) 4.30mm × 3.50mm
TO-92S (3) 4.00mm × 3.15mm
(1) 如需了解所有可用封装,请参阅数据表末尾的可订购产品附录。

热时间常量

LMT85 D003_SNIS167.gif
* 快速热响应 NTC

输出电压与温度间的关系

LMT85 celsius_temp_NEW_SNIS168.gif

4 修订历史记录

Changes from D Revision (June 2017) to E Revision

  • 将汽车器件移到了单独的数据表中 (SNIS200)Go
  • Changed TO-92 GND pin number from: 1 to: 3 Go
  • Changed TO-92 VDD pin number from: 3 to: 1 Go

Changes from C Revision (October 2015) to D Revision

  • 将数据表更新为最新的文档和翻译标准Go
  • 将 AEC-Q100 汽车标准项目符号添加到了“特性”中Go
  • 添加了时间常量图Go
  • 将磁盘驱动器、游戏、无线收发器和手机从“应用”中进行了删除Go
  • Added LPG (TO-92S) packageGo
  • Added Figure 10 to Typical CharacteristicsGo

Changes from B Revision (May 2014) to C Revision

  • Deleted 所有涉及 TO-126 封装的内容Go
  • Added TO-92 LPM pin configuration graphicGo
  • Changed Handling Ratings to ESD Ratings and moved Storage Temperature to Absolute Maximum Ratings tableGo
  • Changed KV to V Go
  • Added TO-92 LP and LPM layout recommendationsGo

Changes from A Revision (June 2013) to B Revision

  • Changed 更改了数据表流程和布局,以符合 TI 新标准。在整个文档内添加了以下章节:应用范围和实施、电源建议、布局布线、器件和文档支持、机械、封装和可订购信息。Go
  • Added 在文档中增加了 TO-92 和 TO-126 封装信息。Go
  • Changed from 450°C/W to 275 °C/W. New specification is derived using TI ' s latest methodology. Go
  • Changed Temperature Accuracy Conditions from 70°C to 20°C and VDD from 1.9V to 1.8VGo
  • Deleted Note: 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.Go

5 Device Comparison Tables

Table 1. Available Device Packages

ORDER NUMBER(1) PACKAGE PIN BODY SIZE (NOM) MOUNTING TYPE
LMT85DCK SOT (AKA(2): SC70, DCK) 5 2.00 mm × 1.25 mm Surface Mount
LMT85LP TO-92 (AKA(2): LP) 3 4.30 mm × 3.50 mm Through-hole; straight leads
LMT85LPG TO-92S (AKA(2): LPG) 3 4.00 mm × 3.15 mm Through-hole; straight leads
LMT85LPM TO-92 (AKA(2): LPM) 3 4.30 mm × 3.50 mm Through-hole; formed leads
LMT85DCK-Q1 SOT (AKA(2): SC70, DCK) 5 2.00 mm × 1.25 mm Surface Mount
(1) For all available packages and complete order numbers, see the Package Option addendum at the end of the data sheet.
(2) AKA = Also Known As

Table 2. Comparable Alternative Devices

DEVICE NAME AVERAGE OUTPUT SENSOR GAIN POWER SUPPLY RANGE
LMT84 –5.5 mV/°C 1.5 V to 5.5 V
LMT85 –8.2 mV/°C 1.8 V to 5.5 V
LMT86 –10.9 mV/°C 2.2 V to 5.5 V
LMT87 –13.6 mV/°C 2.7 V to 5.5 V

6 Pin Configuration and Functions

DCK Package
5-Pin SOT/SC70
(Top View)
LMT85 top_view_see_NS_package_number_MAA05A_nis168.gif
LPG Package
3-Pin TO-92S
(Top View)
LMT85 LPG-3_Iso_SNIS167.gif
LP Package
3-Pin TO-92
(Top View)
LMT85 LP-3_Iso_SNIS167.gif
LPM Package
3-Pin TO-92
(Top View)
LMT85 LPM-3_Iso_SNIS167.gif

Pin Functions

PIN TYPE DESCRIPTION
NAME SOT (SC70) TO-92 TO-92S EQUIVALENT CIRCUIT FUNCTION
GND 2(1) , 5 3 2 Ground N/A Power Supply Ground
OUT 3 2 1 Analog
Output
LMT85 pin_descrip_table_row_two_nis167.gif Outputs a voltage that is inversely proportional to temperature
VDD 1, 4 1 3 Power N/A Positive Supply Voltage
(1) Direct connection to the back side of the die

7 Specifications

7.1 Absolute Maximum Ratings

See (1)(3)
MIN MAX UNIT
Supply voltage −0.3 6 V
Voltage at output pin −0.3 (VDD + 0.5) V
Output current –7 7 mA
Input current at any pin (2) –5 5 mA
Maximum junction temperature (TJMAX) 150 °C
Storage temperature, Tstg –65 150 °C
(1) 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
(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) Soldering process must comply with Reflow Temperature Profile specifications. Refer towww.ti.com/packaging .

7.2 ESD Ratings

VALUE UNIT
LMT85LP in TO-92/TO-92S package
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)(3) ±2500 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1000
LMT85DCK in SC70 package
V(ESD) Electrostatic discharge Human-body model (HBM), per JESD22-A114(3) ±2500 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1000
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
(3) The human body model is a 100-pF capacitor discharged through a 1.5-kΩ resistor into each pin.

7.3 Recommended Operating Conditions

MIN MAX UNIT
Specified temperature TMIN ≤ TA ≤ TMAX  °C
−50 ≤ TA ≤ 150 °C
Supply voltage (VDD) 1.8 5.5 V

7.4 Thermal Information(1)

THERMAL METRIC(2) LMT85/
LMT85-Q1
LMT85LP LMT85LPG UNIT
DCK (SOT/SC70) LP/LPM (TO-92) LPG (TO-92S)
5 PINS 3 PINS 3 PINS
RθJA Junction-to-ambient thermal resistance (3)(4) 275 167 130.4 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 84 90 64.2 °C/W
RθJB Junction-to-board thermal resistance 56 146 106.2 °C/W
ψJT Junction-to-top characterization parameter 1.2 35 14.6 °C/W
ψJB Junction-to-board characterization parameter 55 146 106.2 °C/W
(1) For information on self-heating and thermal response time, see section Mounting and Thermal Conductivity.
(2) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report.
(3) The junction to ambient thermal resistance (RθJA) under natural convection is obtained in a simulation on a JEDEC-standard, High-K board as specified in JESD51-7, in an environment described in JESD51-2. Exposed pad packages assume that thermal vias are included in the PCB, per JESD 51-5.
(4) Changes in output due to self-heating can be computed by multiplying the internal dissipation by the thermal resistance.

7.5 Accuracy Characteristics

These limits do not include DC load regulation. These stated accuracy limits are with reference to the values in Table 3.
PARAMETER TEST CONDITIONS MIN(1) TYP(2) MAX(1) UNIT
Temperature accuracy (3) TA = TJ= 20°C to 150°C; VDD = 1.8 V to 5.5 V –2.7 ±0.4 2.7 °C
TA = TJ= 0°C to 150°C; VDD = 1.9 V to 5.5 V –2.7 ±0.7 2.7 °C
TA = TJ= 0°C to 150°C; VDD = 2.6 V to 5.5 V ±0.3 °C
TA = TJ= –50°C to 0°C; VDD = 2.3 V to 5.5 V –2.7 ±0.7 2.7 °C
TA = TJ= –50°C to 0°C; VDD = 2.9 V to 5.5 V ±0.25 °C
(1) Limits are specific to TI's AOQL (Average Outgoing Quality Level).
(2) Typicals are at TJ = TA = 25°C and represent most likely parametric norm.
(3) 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.

7.6 Electrical Characteristics

Unless otherwise noted, these specifications apply for VDD = +1.8V to +5.5V. MIN and MAX limits apply for TA = TJ = TMIN to TMAX, unless otherwise noted; typical values apply for TA = TJ = 25°C.
PARAMETER TEST CONDITIONS MIN (1) TYP (2) MAX (1) UNIT
Average sensor gain (output transfer function slope) –30°C and 90°C used to calculate average sensor gain –8.2 mV/°C
Load regulation (3) Source ≤ 50 μA, (VDD - VOUT) ≥ 200 mV –1 –0.22 mV
Sink ≤ 50 μA, VOUT ≥ 200 mV 0.26 1 mV
Line regulation (4) 200 μV/V
IS Supply current TA = TJ = 30°C to 150°C, (VDD - VOUT) ≥ 100 mV 5.4 8.1 μA
TA = TJ = -50°C to 150°C, (VDD - VOUT) ≥ 100 mV 5.4 9 μA
CL Output load capacitance 1100 pF
Power-on time (5) CL= 0 pF to 1100 pF 0.7 1.9 ms
Output drive TA = TJ = 25°C –50 +50 µA
(1) Limits are specific to TI's AOQL (Average Outgoing Quality Level).
(2) Typicals are at TJ = TA = 25°C and represent most likely parametric norm.
(3) Source currents are flowing out of the LMT85. Sink currents are flowing into the LMT85.
(4) 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.
(5) Specified by design and characterization.

7.7 Typical Characteristics

LMT85 temp_error_vs_temp_nis168.gif Figure 1. Temperature Error vs Temperature
LMT85 supply_current_vs_temp_nis168.gif Figure 3. Supply Current vs Temperature
LMT85 load_reg_sourcing_current_nis168.gif Figure 5. Load Regulation, Sourcing Current
LMT85 change_in_vout_vs_overhead_voltage_nis168.gif Figure 7. Change in Vout vs Overhead Voltage
LMT85 output_voltage_vs_supply_voltage_nis168.gif Figure 9. Output Voltage vs Supply Voltage
LMT85 C002_SNIS168.png Figure 2. Minimum Operating Temperature vs
Supply Voltage
LMT85 supply_current_vs_supply_voltage_nis168.gif Figure 4. Supply Current vs Supply Voltage
LMT85 load_reg_sinking_current_nis168.gif Figure 6. Load Regulation, Sinking Current
LMT85 supply_noise_gain_vs_freq_nis168.gif Figure 8. Supply-Noise Gain vs Frequency
LMT85 D003_SNIS167.gif Figure 10. LMT85LPG Thermal Response vs Common Leaded Thermistor With 1.2-m/s Airflow

8 Detailed Description

8.1 Overview

The LMT85 is an analog output temperature sensor. The temperature sensing element is comprised of a simple base emitter junction that is forward biased by a current source. The temperature-sensing element is then buffered by an amplifier and provided to the OUT pin. The amplifier has a simple push-pull output stage thus providing a low impedance output source.

8.2 Functional Block Diagram

Full-Range Celsius Temperature Sensor (−50°C to 150°C).

LMT85 FBD_SNIS168.gif

8.3 Feature Description

8.3.1 LMT85 Transfer Function

The output voltage of the LMT85, across the complete operating temperature range, is shown in Table 3. This table is the reference from which the LMT85 accuracy specifications (listed in the Accuracy 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 the LMT85 product folder under Tools and Software Models.

Table 3. LMT85 Transfer Table

TEMP
(°C)
VOUT
(mV)
TEMP
(°C)
VOUT
(mV)
TEMP
(°C)
VOUT
(mV)
TEMP
(°C)
VOUT
(mV)
TEMP
(°C)
VOUT
(mV)
-50 1955 -10 1648 30 1324 70 991 110 651
-49 1949 -9 1639 31 1316 71 983 111 642
-48 1942 -8 1631 32 1308 72 974 112 634
-47 1935 -7 1623 33 1299 73 966 113 625
-46 1928 -6 1615 34 1291 74 957 114 617
-45 1921 -5 1607 35 1283 75 949 115 608
-44 1915 -4 1599 36 1275 76 941 116 599
-43 1908 -3 1591 37 1267 77 932 117 591
-42 1900 -2 1583 38 1258 78 924 118 582
-41 1892 -1 1575 39 1250 79 915 119 573
-40 1885 0 1567 40 1242 80 907 120 565
-39 1877 1 1559 41 1234 81 898 121 556
-38 1869 2 1551 42 1225 82 890 122 547
-37 1861 3 1543 43 1217 83 881 123 539
-36 1853 4 1535 44 1209 84 873 124 530
-35 1845 5 1527 45 1201 85 865 125 521
-34 1838 6 1519 46 1192 86 856 126 513
-33 1830 7 1511 47 1184 87 848 127 504
-32 1822 8 1502 48 1176 88 839 128 495
-31 1814 9 1494 49 1167 89 831 129 487
-30 1806 10 1486 50 1159 90 822 130 478
-29 1798 11 1478 51 1151 91 814 131 469
-28 1790 12 1470 52 1143 92 805 132 460
-27 1783 13 1462 53 1134 93 797 133 452
-26 1775 14 1454 54 1126 94 788 134 443
-25 1767 15 1446 55 1118 95 779 135 434
-24 1759 16 1438 56 1109 96 771 136 425
-23 1751 17 1430 57 1101 97 762 137 416
-22 1743 18 1421 58 1093 98 754 138 408
-21 1735 19 1413 59 1084 99 745 139 399
-20 1727 20 1405 60 1076 100 737 140 390
-19 1719 21 1397 61 1067 101 728 141 381
-18 1711 22 1389 62 1059 102 720 142 372
-17 1703 23 1381 63 1051 103 711 143 363
-16 1695 24 1373 64 1042 104 702 144 354
-15 1687 25 1365 65 1034 105 694 145 346
-14 1679 26 1356 66 1025 106 685 146 337
-13 1671 27 1348 67 1017 107 677 147 328
-12 1663 28 1340 68 1008 108 668 148 319
-11 1656 29 1332 69 1000 109 660 149 310
150 301

Although the LMT85 is very linear, its response does have a slight umbrella parabolic shape. This shape is very accurately reflected in Table 3. The Transfer Table can be calculated by using the parabolic equation (Equation 1).

Equation 1. LMT85 ParaEq_G01_SNIS168.gif

The parabolic equation is an approximation of the transfer table and the accuracy of the equation degrades slightly at the temperature range extremes. Equation 1 can be solved for T resulting in:

Equation 2. LMT85 ParaEq_GainSolutionForT1_SNIS168.gif

For an even less accurate linear transfer function approximation, a line can easily be calculated over the desired temperature range using values from the Table and a two-point equation (Equation 3):

Equation 3. LMT85 equation_1_nis168.gif

where

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

For example, if the user wanted to resolve this equation, over a temperature range of 20°C to 50°C, they would proceed as follows:

Equation 4. LMT85 equation_2_nis168.gif
Equation 5. LMT85 equation_3_nis168.gif
Equation 6. LMT85 equation_4_nis168.gif

Using this method of linear approximation, the transfer function can be approximated for one or more temperature ranges of interest.

8.4 Device Functional Modes

8.4.1 Mounting and Thermal Conductivity

The LMT85 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 LMT85 die is directly attached to the GND pin. The temperatures of the lands and traces to the other leads of the LMT85 will also affect the temperature reading.

Alternatively, the LMT85 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 LMT85 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 LMT85 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 (RθJA or θJA) is the parameter used to calculate the rise of a device junction temperature due to its power dissipation. Use Equation 7 to calculate the rise in the LMT85 die temperature:

Equation 7. LMT85 equation_5_nis168.gif

where

  • TA is the ambient temperature,
  • IS is the supply current,
  • ILis the load current on the output,
  • and VO is the output voltage.

For example, in an application where TA = 30°C, VDD = 5 V, IS = 5.4 μA, VOUT = 1324 mV, and IL = 2 μA, the junction temperature would be 30.014°C, showing a self-heating error of only 0.014°C. Because the junction temperature of the LMT85 is the actual temperature being measured, take care to minimize the load current that the LMT85 is required to drive. Thermal Information shows the thermal resistance of the LMT85.

8.4.2 Output and Noise Considerations

A push-pull output gives the LMT85 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. The LMT85 device is ideal for this and other applications which require strong source or sink current.

The LMT85 supply-noise gain (the ratio of the AC signal on VOUT to the AC signal on VDD) was measured during bench tests. The typical attenuation is shown in Figure 8 found in the Typical Characteristics. 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 5 centimeters of the LMT85.

8.4.3 Capacitive Loads

The LMT85 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 LMT85 can drive a capacitive load less than or equal to 1100 pF as shown in Figure 11. For capacitive loads greater than 1100 pF, a series resistor may be required on the output, as shown in Figure 12.

LMT85 no_decoupling_cap_loads_less_nis168.gif Figure 11. LMT85 No Decoupling Required for Capacitive Loads Less Than 1100 pF
LMT85 series_resister_cap_loads_greater_nis168.gif Figure 12. LMT85 with Series Resistor for Capacitive Loading Greater Than 1100 pF

Table 4. Recommended Series Resistor Values

CLOAD MINIMUM RS
1.1 nF to 99 nF 3 kΩ
100 nF to 999 nF 1.5 kΩ
1 μF 800 Ω

8.4.4 Output Voltage Shift

The LMT85 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 millivolts) 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 Accuracy Characteristics table already include this possible shift.

 

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