LMT70可穿戴设备资源-CSDN文库

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LMT70

MSP430

TAO

GPIO2

P2.3

ADC

(12-bit)

GPIO1

2.2V to 3.6V

Coin Cell

Battery

T_ON

VDD

P2.5_VREF

1.5V

Vref

-0.60

-0.50

-0.40

-0.30

-0.20

-0.10

0.00

0.10

0.20

0.30

0.40

0.50

0.60

±60 ±40 ±20

0 20 40 60 80 100 120 140 160

Accuracy (ƒC)

DUT Temperature (ƒC)

C001

Max Limit

Min Limit

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

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 3 说说明明

• 精度：

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

– 20°C 至 42°C 范围内为 ±0.05°C（典型值）或

±0.13°C（最大值）

器。 LMT70 几乎适用于所有高精度、低功耗的经济高

– -20°C 至 90°C 范围内为 ±0.2°C（最大值）

效型温度感测应用，例如物联网 (IoT) 传感器节点、医

– 90°C 至 110°C 范围内为 ±0.23°C（最大值）

疗温度计、高精度仪器仪表和电池供电设备。 LMT70

– -55°C 至 150°C 范围内为 ±0.36°C（最大值）

也是 RTD 和高精度 NTC/PTC 热敏电阻的理想替代产

• 宽温度范围：−55°C 至 150°C

品。

• 卷带包装中相邻两个 LMT70A 的温度匹配：30°C

多个 LMT70 可利用输出使能引脚来共用一个模数转换

时为 0.1°C（最大值）

器 (ADC) 通道，从而简化 ADC 校准过程并降低精密

• 带有输出使能引脚的超线性模拟温度传感器

温度感测系统的总成本。 LMT70 还具有一个线性低阻

• 负温度系数 (NTC) 输出斜率：-5.19mV/°C

抗输出，支持与现成的微控制器 (MCU)/ADC 无缝连

• R

DS on

< 80Ω 时输出开启/关闭开关

接。 LMT70 的热耗散低于 36µW，这种超低自发热特

• 宽电源范围：2.0V 至 5.5V

性支持其在宽温度范围内保持高精度。

• 低电源电流：9.2µA（典型值）12µA（最大值）

LMT70A 具有出色的温度匹配性能，同一卷带中取出

• 超小型 0.88mm x 0.88mm 4 凸点 WLCSP

(DSBGA) 封装

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

2 应应用用

是一套理想的解决方案。

• 物联网 (IoT) 传感器节点

器器件件信信息息

(1)

• 工业电阻式温度检测器 (RTD)（AA 类）或精密

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））

NTC/正温度系数 (PTC) 热敏电阻的替代产品

DSBGA - WLCSP (4)

• 医疗/健身设备

LMT70 0.88mm x 0.88mm

YFQ

• 医疗温度计

• 人体温度监视器

• 计量温度补偿 (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。

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 精精度度与与温温度度间间的的关关系系

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

LMT70

LMT70A

ZHCSDV8A –MARCH 2015–REVISED JULY 2015

www.ti.com.cn

目目录录

9.2 Functional Block Diagram ....................................... 11

1 特特性性.......................................................................... 1

9.3 Feature Description................................................. 11

2 应应用用.......................................................................... 1

9.4 Device Functional Modes........................................ 15

3 说说明明.......................................................................... 1

10 Application and Implementation........................ 16

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

10.1 Application Information.......................................... 16

（（−55°C 至至 150°C））................................................ 1

10.2 Typical Application ................................................ 16

5 修修订订历历史史记记录录 ........................................................... 2

10.3 System Examples ................................................. 21

6 Device Comparison Table..................................... 3

11 Power Supply Recommendations ..................... 21

7 Pin Configuration and Functions......................... 3

12 Layout................................................................... 22

8 Specifications......................................................... 4

12.1 Layout Guidelines ................................................. 22

8.1 Absolute Maximum Ratings ...................................... 4

12.2 Layout Example .................................................... 22

8.2 ESD Ratings.............................................................. 4

13 器器件件和和文文档档支支持持 ..................................................... 23

8.3 Recommended Operating Conditions....................... 4

13.1 相关链接................................................................ 23

8.4 Thermal Information.................................................. 4

13.2 文档支持 ............................................................... 23

8.5 Electrical Characteristics........................................... 5

13.3 社区资源................................................................ 23

8.6 Electrical Characteristics Temperature Lookup Table

13.4 商标 ....................................................................... 23

(LUT).......................................................................... 6

13.5 静电放电警告......................................................... 23

8.7 Switching Characteristics.......................................... 7

13.6 Glossary................................................................ 23

8.8 Typical Performance Characteristics ....................... 7

14 机机械械、、封封装装和和可可订订购购信信息息....................................... 23

9 Detailed Description............................................ 11

9.1 Overview ................................................................. 11

5 修修订订历历史史记记录录

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

LMT70

LMT70A

www.ti.com.cn

ZHCSDV8A –MARCH 2015–REVISED JULY 2015

8.5 Electrical Characteristics

Limits apply for T

= T

MIN

to T

MAX

and VDD of 2.00V to 5.5V and VDD ≥ V

TAO

+ 1V, unless otherwise noted.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

TEMPERATURE ACCURACY

= –55°C VDD = 2.7 V -0.33 0.33

= –40°C VDD = 2.7 V –0.27 0.27

TAO accuracy

= –20°C VDD = 2.7 V –0.2 0.2

(These stated accuracy limits

= –10°C VDD = 2.7 V –0.18 0.18

are with reference to the values

in Electrical Characteristics T

= 20°C to 42°C VDD = 2.7 V –0.13 ±0.05 0.13 °C

Temperature Lookup Table

= 50°C VDD = 2.7 V -0.15 0.15

(LUT), LMT70 temperature-to-

= 90°C VDD = 2.7 V –0.20 0.20

voltage.)

(1)

= 110°C VDD = 2.7 V –0.23 0.23

= 150°C VDD = 2.7 V –0.36 0.36

Accuracy temperature VDD = 2.7V -2.6 +2.6 m°C/°C

ATC coefficient (note, uses end point

calculations)

(2)

–55°C ≤ T

≤ 10°C VDD = V

TAO

+ 1.1 V –9 –2 8

to 4.0 V

VDD = 2.0 V to 4.0

Accuracy power supply

10°C ≤ T

≤ 120°C

APSS sensitivity (note uses end point m°C /V

calculations)

120°C ≤ T

≤ VDD = 2.0 V to 4.0 –15 8

150°C V

VDD = 4 V to 5.5 V –30 –12 0

TAO

Output Voltage T

= 30°C VDD = 2.7 V 943.227 mV

Sensor gain –5.194 mV/°C

approximately V

= 2.0 V to 3.6 V 0.1

°C

Matching of two adjacent parts

30°C

in tape and reel for

= 30°C to 2.5 m°C /°C

LMT70AYFQR, LMT70AYFQT

150°C

only (see curve Figure 19 for

specification at other

= 20°C to 30°C V

= 2.0 V to 3.6 V -2.5

temperatures)

(3)(2)

= -55°C to 30°C V

= 2.7 V to 3.6 V –2.5

Time stability

(4)

10k hours at 90°C –0.1 ±0.01 0.1 °C

ANALOG OUTPUT

Operating output voltage 0 µA≤I

≤5 µA 0 0.4 mV

change with load current

-5 µA≤I

≤0 µA -0.4 0 mV

ROUT Output Resistance 28 80 Ω

TAO Off Leakage Current V

TAO

≤ VDD – 0.6v, V

T_ON

=GND 0.005 0.5 µA

TAO

≥ 0.2V, V

T_ON

= GND -0.5 -0.005

Output Load Capacitance 1100 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

in the curve Figure 3.

(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.

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