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LMT70可穿戴设备.pdf
1 特性
2 应用
3 说明
4 宽温度范围、精密、有源 RTD 或 NTC 的替代产品（−55°C 至 150°C）
目录
5 修订历史记录
6 Device Comparison Table
7 Pin Configuration and Functions
8 Specifications
8.1 Absolute Maximum Ratings
8.2 ESD Ratings
8.3 Recommended Operating Conditions
8.4 Thermal Information
8.5 Electrical Characteristics
8.6 Electrical Characteristics Temperature Lookup Table (LUT)
8.7 Switching Characteristics
8.8 Typical Performance Characteristics
9 Detailed Description
9.1 Overview
9.2 Functional Block Diagram
9.3 Feature Description
9.3.1 Temperature Analog Output (TAO)
9.3.1.1 LMT70 Output Transfer Function
9.3.1.2 LMT70A TAO Matching
9.3.1.3 TAO Noise Considerations
9.3.1.4 TAO Capacitive Loads
9.3.2 TON Digital Input
9.3.3 Light Sensitivity
9.4 Device Functional Modes
10 Application and Implementation
10.1 Application Information
10.2 Typical Application
10.2.1 Design Requirements
10.2.2 Detailed Design Procedure
10.2.2.1 Temperature Algorithm Selection
10.2.2.2 ADC Requirements
10.2.3 Finer Resolution LUT
10.2.4 Application Curves
10.3 System Examples
11 Power Supply Recommendations
12 Layout
12.1 Layout Guidelines
12.1.1 Mounting and Temperature Conductivity
12.2 Layout Example
13 器件和文档支持
13.1 相关链接
13.2 文档支持
13.2.1 相关文档
13.3 社区资源
13.4 商标
13.5 静电放电警告
13.6 Glossary
14 机械、封装和可订购信息
LMT70, LMT70A
ZHCSDV8A –MARCH 2015–REVISED JULY 2015
LMT70、、LMT70A ±0.05°C 精精密密模模拟拟温温度度传传感感器器、、RTD 和和精精密密 NTC 热热敏敏
电电阻阻 IC
1 特特性性
1• 精度：
– 20°C 至 42°C 范围内为 ±0.05°C（典型值） 或
±0.13°C（最大值）
– -20°C 至 90°C 范围内为 ±0.2°C（最大值）
– 90°C 至 110°C 范围内为 ±0.23°C（最大值）
– -55°C 至 150°C 范围内为 ±0.36°C（最大值）
• 宽温度范围：−55°C 至 150°C
• 卷带包装中相邻两个 LMT70A 的温度匹配：30°C
时为 0.1°C（最大值）
• 带有输出使能引脚的超线性模拟温度传感器
• 负温度系数 (NTC) 输出斜率：-5.19mV/°C
• RDS on < 80Ω 时输出开启/关闭开关
• 宽电源范围：2.0V 至 5.5V
• 低电源电流：9.2µA（典型值）12µA（最大值）
• 超小型 0.88mm x 0.88mm 4 凸点 WLCSP
(DSBGA) 封装
2 应应用用
• 物联网 (IoT) 传感器节点
• 工业电阻式温度检测器 (RTD)（AA 类）或精密
NTC/正温度系数 (PTC) 热敏电阻的替代产品
3 说说明明
LMT70 是一款带有输出使能引脚的超小型、高精度、
低功耗互补金属氧化物半导体 (CMOS) 模拟温度传感
器。 LMT70 几乎适用于所有高精度、低功耗的经济高
效型温度感测应用，例如物联网 (IoT) 传感器节点、医
疗温度计、高精度仪器仪表和电池供电设备。 LMT70
也是 RTD 和高精度 NTC/PTC 热敏电阻的理想替代产
品。
多个 LMT70 可利用输出使能引脚来共用一个模数转换
器 (ADC) 通道，从而简化 ADC 校准过程并降低精密
温度感测系统的总成本。 LMT70 还具有一个线性低阻
抗输出，支持与现成的微控制器 (MCU)/ADC 无缝连
接。 LMT70 的热耗散低于 36µW，这种超低自发热特
性支持其在宽温度范围内保持高精度。
LMT70A 具有出色的温度匹配性能，同一卷带中取出
的相邻两个 LMT70A 的温度最多相差 0.1°C。 因此，
对于需要计算热量传递的能量计量应用而言，LMT70A
是一套理想的解决方案。
器器件件信信息息(1)
器器件件型型号号
封封装装
封封装装尺尺寸寸（（标标称称值值））
DSBGA - WLCSP (4)
YFQ
0.88mm x 0.88mm
• 医疗/健身设备
• 医疗温度计
• 人体温度监视器
• 计量温度补偿
4 宽宽温温度度范范围围、、精精密密、、有有源源 RTD 或或 NTC 的的替替代代产产品品（（−55°C 至至 150°C））
LMT70
(1) 要了解所有可用封装，请见数据表末尾的可订购产品附录。
LMT70 精精度度与与温温度度间间的的关关系系
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.
English Data Sheet: SNIS187
LMT70MSP430TAOGPIO2P2.3ADC(12-bit)MUXGPIO12.2V to 3.6VCoin CellBatteryT_ONVDDP2.5_VREF1.5VVref-0.60-0.50-0.40-0.30-0.20-0.100.000.100.200.300.400.500.60–60 –40 –20 020406080100120140160Accuracy (C) DUT Temperature (C) C001 Max Limit Min Limit ProductFolderSample &BuyTechnicalDocumentsTools &SoftwareSupport &Community
LMT70, LMT70A
ZHCSDV8A –MARCH 2015–REVISED JULY 2015
1 特特性性.......................................................................... 1
2 应应用用.......................................................................... 1
3 说说明明.......................................................................... 1
4 宽宽温温度度范范围围、、精精密密、、有有源源 RTD 或或 NTC 的的替替代代产产品品
（（−55°C 至至 150°C））................................................ 1
5 修修订订历历史史记记录录 ........................................................... 2
6 Device Comparison Table..................................... 3
7 Pin Configuration and Functions ......................... 3
8 Specifications......................................................... 4
8.1 Absolute Maximum Ratings ...................................... 4
8.2 ESD Ratings.............................................................. 4
8.3 Recommended Operating Conditions....................... 4
8.4 Thermal Information.................................................. 4
8.5 Electrical Characteristics........................................... 5
8.6 Electrical Characteristics Temperature Lookup Table
(LUT).......................................................................... 6
8.7 Switching Characteristics.......................................... 7
8.8 Typical Performance Characteristics ....................... 7
9 Detailed Description ............................................ 11
9.1 Overview ................................................................. 11
5 修修订订历历史史记记录录
目目录录
www.ti.com.cn
9.2 Functional Block Diagram ....................................... 11
9.3 Feature Description................................................. 11
9.4 Device Functional Modes........................................ 15
10 Application and Implementation........................ 16
10.1 Application Information.......................................... 16
10.2 Typical Application ................................................ 16
10.3 System Examples ................................................. 21
11 Power Supply Recommendations ..................... 21
12 Layout................................................................... 22
12.1 Layout Guidelines ................................................. 22
12.2 Layout Example .................................................... 22
13 器器件件和和文文档档支支持持 ..................................................... 23
13.1 相关链接................................................................ 23
13.2 文档支持 ............................................................... 23
13.3 社区资源................................................................ 23
13.4 商标 ....................................................................... 23
13.5 静电放电警告......................................................... 23
13.6 Glossary ................................................................ 23
14 机机械械、、封封装装和和可可订订购购信信息息....................................... 23
Changes from Original (March 2015) to Revision A
Page
• 已添加 典型精度规范。........................................................................................................................................................... 1
• 已将 ±0.2°C 精度的温度范围从“20°C 至 90°C”扩展至“-20°C 至 90°C”。............................................................................... 1
• 已添加 9.2µA（典型值） ........................................................................................................................................................ 1
• Updated schematic................................................................................................................................................................. 3
• Added -20°C accuracy specification ...................................................................................................................................... 5
• Changed from 20°C to 20°C to 42°C for accuracy specification condition ........................................................................... 5
• Added 50°C accuracy specification ....................................................................................................................................... 5
• Added typical supply current specification.............................................................................................................................. 6
• Changed from 942.547 to 942.552......................................................................................................................................... 6
• Changed from 943.907 to 943.902......................................................................................................................................... 6
• Changed from 890.423 to 890.500......................................................................................................................................... 6
• Changed from 891.934 to 891.857......................................................................................................................................... 6
• Added -20°C histogram curve ................................................................................................................................................ 8
• Removed erroneous 10°C histogram ..................................................................................................................................... 8
• Changed y axis units from (V) to (mV) ................................................................................................................................... 9
• Added Output Noise vs Frequency curve............................................................................................................................. 10
2
版权 © 2015, Texas Instruments Incorporated
www.ti.com.cn
6 Device Comparison Table
LMT70, LMT70A
ZHCSDV8A –MARCH 2015–REVISED JULY 2015
Order Number
Matching Specification Provided(1)
LMT70YFQR, LMT70YFQT
LMT70AYFQR, LMT70AYFQT
No
Yes, 0.1°C at approximately 30°C(1)
(1)
In order to meet the matching specification of the LMT70A, two units
must be picked from adjacent positions from one tape and reel. If
PCB rework is required, involving the LMT70A, then the pair of the
LMT70A matched units must be replaced. Matching features (which
include, without limitation, electrical matching characteristics of
adjacent Components as they are delivered in original packaging
from TI) are warranted solely to the extent that the purchaser can
demonstrate to TI’s satisfaction that the particular Component(s) at
issue were adjacent in original packaging as delivered by TI.
Customers should be advised that the small size of these
Components means they are not individually traceable at the unit
level and it may be difficult to establish the original position of the
Components once they have been removed from that original
packaging as delivered by TI.
7 Pin Configuration and Functions
DSBGA or WLCSP
4 Pins YFQ
(Top View)
PIN
NAME
GND
VDD
NO.
A1
A2
TYPE
EQUIVALENT CIRCUIT
DESCRIPTION
Ground
Power
Ground reference for the device
Supply voltage
Pin Functions
TAO
B1
Analog
Output
Temperature analog output pin
T_ON
B2
Digital Input
T_ON pin. Active High input.
If T_ON = 0, then the TAO output is open.
If T_ON = 1, then TAO pin is connected to the temperature output voltage.
Tie this pin to VDD if not used.
Copyright © 2015, Texas Instruments Incorporated
3
VDDGNDVDDGNDVSENSET_ONT_ONTAO(B1)GND(A1)T_ON(B2)VDD(A2)LMT70
LMT70, LMT70A
ZHCSDV8A –MARCH 2015–REVISED JULY 2015
8 Specifications
8.1 Absolute Maximum Ratings(1)(2)
www.ti.com.cn
MAX
UNIT
Supply voltage
Voltage at T_ON and TAO
Current at any pin
Storage temperature, Tstg
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
6
6
5
150
V
V
mA
°C
MIN
−0.3
−0.3
-65
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) Soldering process must comply with Reflow Temperature Profile specifications. Refer to www.ti.com/packaging.
8.2 ESD Ratings
V(ESD)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)
Charged-device model (CDM), per JEDEC specification JESD22-
C101(2)
VALUE
±2000
±750
UNIT
V
(1)
(2)
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
8.3 Recommended Operating Conditions
Specified temperature (TMIN ≤ TA ≤ TMAX)
Supply voltage
8.4 Thermal Information
THERMAL METRIC(1)
RθJA
RθJC(top)
RθJB
ψJT
ψJB
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Thermal response time to 63% of final value in stirred oil (dominated by PCB see
layout)
Thermal response time to 63% of final value in still air (dominated by PCB see
layout)
MIN
−55
2.0
NOM
MAX
150
5.5
UNIT
°C
V
LMT70
DSBGA or
WLCSP
YFQ 4 PINS
187
2.3
105
10.9
104
1.5
73
UNIT
°C/W
sec
sec
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
4
Copyright © 2015, Texas Instruments Incorporated
www.ti.com.cn
LMT70, LMT70A
ZHCSDV8A –MARCH 2015–REVISED JULY 2015
8.5 Electrical Characteristics
Limits apply for TA = TJ = TMIN to TMAX and VDD of 2.00V to 5.5V and VDD ≥ VTAO + 1V, unless otherwise noted.
PARAMETER
TEMPERATURE ACCURACY
TEST CONDITIONS
MIN
TYP
MAX
UNIT
TAO accuracy
(These stated accuracy limits
are with reference to the values
in Electrical Characteristics
Temperature Lookup Table
(LUT), LMT70 temperature-to-
voltage.)(1)
Accuracy temperature
coefficient (note, uses end point
calculations)(2)
Accuracy power supply
sensitivity (note uses end point
calculations)
ATC
APSS
VTAO
VDD = 2.7 V
TA = –55°C
VDD = 2.7 V
TA = –40°C
VDD = 2.7 V
TA = –20°C
VDD = 2.7 V
TA = –10°C
TA = 20°C to 42°C VDD = 2.7 V
VDD = 2.7 V
TA = 50°C
VDD = 2.7 V
TA = 90°C
TA = 110°C
VDD = 2.7 V
TA = 150°C
VDD = 2.7 V
VDD = 2.7V
–55°C ≤ TA ≤ 10°C VDD = VTAO + 1.1 V
10°C ≤ TA ≤ 120°C V
120°C ≤ TA ≤
150°C
to 4.0 V
VDD = 2.0 V to 4.0
VDD = 2.0 V to 4.0
V
VDD = 4 V to 5.5 V
VDD = 2.7 V
Output Voltage
Sensor gain
TA = 30°C
Matching of two adjacent parts
in tape and reel for
LMT70AYFQR, LMT70AYFQT
only (see curve Figure 19 for
specification at other
temperatures)(3)(2)
Time stability(4)
ANALOG OUTPUT
ROUT
Operating output voltage
change with load current
Output Resistance
TAO Off Leakage Current
Output Load Capacitance
VDD = 2.0 V to 3.6 V
TA approximately
30°C
TA = 30°C to
150°C
TA = 20°C to 30°C VDD = 2.0 V to 3.6 V
TA = -55°C to 30°C VDD = 2.7 V to 3.6 V
10k hours at 90°C
0 µA≤IL≤5 µA
-5 µA≤IL≤0 µA
VTAO ≤ VDD – 0.6v, VT_ON=GND
VTAO ≥ 0.2V, VT_ON = GND
-0.33
–0.27
–0.2
–0.18
–0.13
-0.15
–0.20
–0.23
–0.36
-2.6
±0.05
–9
–2
–15
–30
-2.5
–2.5
–0.1
0
-0.4
-0.5
–12
943.227
–5.194
±0.01
28
0.005
-0.005
°C
0.33
0.27
0.2
0.18
0.13
0.15
0.20
0.23
0.36
+2.6 m°C/°C
8
8
0
0.1
m°C /V
mV
mV/°C
°C
2.5 m°C /°C
0.1
0.4
0
80
0.5
1100
°C
mV
mV
Ω
µA
pF
(1) Accuracy is defined as the error between the measured and reference output voltages, tabulated in the Conversion Table at the
specified conditions of supply voltage and temperature (expressed in °C). These stated accuracy limits are with reference to the values
in Electrical Characteristics Temperature Lookup Table (LUT), see Accuracy Curve for other temperatures. Accuracy limits do not
include load regulation or aging; they assume no DC load.
(2) The accuracy temperature coefficient specification is given to indicate part to part performance and does not correlate to the limits given
(3)
in the curve Figure 3.
In order to meet the matching specification of the LMT70A, two units must be picked from adjacent positions from one tape and reel. If
PCB rework is required, involving the LMT70A, then the pair of the LMT70A matched units must be replaced. Matching features (which
include, without limitation, electrical matching characteristics of adjacent Components as they are delivered in original packaging from
TI) are warranted solely to the extent that the purchaser can demonstrate to TI’s satisfaction that the particular Component(s) at issue
were adjacent in original packaging as delivered by TI. Customers should be advised that the small size of these Components means
they are not individually traceable at the unit level and it may be difficult to establish the original position of the Components once they
have been removed from that original packaging as delivered by TI.
(4) Determined using accelerated operational life testing at 150°C junction temperature; not tested during production.
Copyright © 2015, Texas Instruments Incorporated
5
LMT70, LMT70A
ZHCSDV8A –MARCH 2015–REVISED JULY 2015
www.ti.com.cn
Electrical Characteristics (continued)
Limits apply for TA = TJ = TMIN to TMAX and VDD of 2.00V to 5.5V and VDD ≥ VTAO + 1V, unless otherwise noted.
TYP
MAX
UNIT
MIN
1.0
1.1
PARAMETER
TEST CONDITIONS
POWER SUPPLY
VDO
Dropout Voltage (VDD-VTAO)(5)
Power Supply Current
Shutdown Current
LOGIC INPUT
T_ON Logic Low Input
Threshold
T_ON Logic High Input
Threshold
T_ON Input Current
–20°C ≤ TA ≤ 20°C
–55°C ≤ TA ≤ –20°C
VDD ≤ 0.4V (-55°C to +110°C)
VDD ≤ 0.4V (+110°C to +150°C)
-55°C to +150°C
-55°C to +150°C
VT_ON = VDD
VT_ON = GND
V
µA
nA
nA
V
V
9.2
12
50
350
0.5
0.33*VDD
0.66*VDD
VDD-0.5
0.15
-0.02
-1
1
µA
(5) Dropout voltage (VDO) is defined as the smallest possible differential voltage measured between VTAO and VDD that causes the
temperature error to degrade by 0.02°C.
8.6 Electrical Characteristics Temperature Lookup Table (LUT)
applies for VDD of 2.7V
TEMPERATURE (°C)
VTAO (mV)
LOCAL SLOPE (mV/°C)
-55
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
MIN
1373.576
1348.990
1299.270
1249.242
1198.858
1148.145
1097.151
1045.900
994.367
942.547
890.500
838.097
785.509
732.696
679.672
626.435
572.940
519.312
465.410
411.288
356.458
300.815
TYP
1375.219
1350.441
1300.593
1250.398
1199.884
1149.070
1097.987
1046.647
995.050
943.227
891.178
838.882
786.360
733.608
680.654
627.490
574.117
520.551
466.760
412.739
358.164
302.785
MAX
1376.862
1351.892
1301.917
1251.555
1200.910
1149.995
1098.823
1047.394
995.734
943.902
891.857
839.668
787.210
734.520
681.636
628.545
575.293
521.789
468.110
414.189
359.871
304.756
-4.958
-4.976
-5.002
-5.036
-5.066
-5.108
-5.121
-5.134
-5.171
-5.194
-5.217
-5.241
-5.264
-5.285
-5.306
-5.327
-5.347
-5.368
-5.391
-5.430
-5.498
-5.538
6
Copyright © 2015, Texas Instruments Incorporated
www.ti.com.cn
LMT70, LMT70A
ZHCSDV8A –MARCH 2015–REVISED JULY 2015
8.7 Switching Characteristics
Limits apply for TA = TJ = TMIN to TMAX and VDD of 2.00V to 5.5V and VDD ≥ VTAO + 1V, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
tPOWER
tT_ON
CT_ON
Power-on Time to 99% of final
voltage value
T_ON Time to 99% of final voltage
value (note dependent on RON and CL=150pF
C load)
T_ON Digital Input Capacitance
CL=0 pF to 1100 pF; VDD
connected T_ON
TYP
0.6
30
2.2
MAX
UNIT
1
500
ms
µs
pF
Figure 1. Definition of tT_ON
Figure 2. Definition of tPOWER
8.8 Typical Performance Characteristics
VDD=2.7V
using LUT (Look-Up Table) and linear interporlation for conversion
of voltage to temperature
Figure 3. Temperature Accuracy
VDD=2.7V
using LUT table for conversion of voltage to temperature
Figure 4. Accuracy Histogram at -55°C
Copyright © 2015, Texas Instruments Incorporated
7
-0.60-0.50-0.40-0.30-0.20-0.100.000.100.200.300.400.500.60–60 –40 –20 020406080100120140160Accuracy (C) DUT Temperature (C) C001 Max Limit Min Limit Frequency Accuracy (C) C005 -0.5 +0.5 0 -0.33°C Min Limit 0.33°C Max Limit VDDTAOtPOWER99%2V T_ONTAOtT_ON99%0.66xVDD
LMT70, LMT70A
ZHCSDV8A –MARCH 2015–REVISED JULY 2015
Typical Performance Characteristics (continued)
www.ti.com.cn
VDD=2.7V
using LUT table for conversion of voltage to temperature
Figure 5. Accuracy Histogram at -40°C
VDD=2.7V
using LUT table for conversion of voltage to temperature
Figure 6. Accuracy Histogram at –20°C
VDD=2.7V
using LUT table for conversion of voltage to temperature
VDD=2.7V
using LUT table for conversion of voltage to temperature
Figure 7. Accuracy Histogram at -10°C
Figure 8. Accuracy Histogram at 30°C
VDD=2.7V
using LUT table for conversion of voltage to temperature
VDD=2.7V
using LUT table for conversion of voltage to temperature
Figure 9. Accuracy Histogram at 50°C
Figure 10. Accuracy Histogram at 90°C
8
Copyright © 2015, Texas Instruments Incorporated
Frequency Accuracy (C) C006 -0.5 +0.5 0 0.15°C Max Limit -0.15°C Min Limit Frequency Accuracy (C) C007 -0.5 +0.5 0 0.2°C Max Limit -0.2°C Min Limit Frequency Accuracy (C) C002 -0.5 +0.5 0 0.18°C Max Limit -0.18°C Min Limit Frequency Accuracy (C) C002 -0.5 +0.5 0 0.13°C Max Limit -0.13°C Min Limit Frequency Accuracy (C) C003 -0.5 +0.5 0 -0.27°C Min Limit 0.27°C Max Limit Frequency Accuracy (C) C024 -0.5 +0.5 0 0.2°C Max Limit -0.2°C Min Limit
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