Datasheet > MLX90247B

MLX90247B

更新时间： 2024-11-27 04:15:11

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描述
Thermopile w/On-Chip Thermistor

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MLX90247B 数据手册

MLX90247B

Thermopile w/On-Chip Thermistor

Features and Benefits

Solid state sensor

High reliability

Low cost, small size

On chip temperature sensor

Applications

Non-Contact Temperature Sensing

Differential Temperature Sensing

Climate Control

Ear, Temple Thermometers

Household and Commercial Appliances

Ordering Information

Part No.

Description

MLX90247B

Thermopile with On-chip PTC Thermistor

Functional Diagram

Description

The MLX90247B is a thermopile sensor IC which

detects very small amounts of heat radiation. The

sensor consists of a membrane with a thermopile on

top of it.

The hot junctions of the thermopile are positioned

near the center of the membrane, the cold junctions

above the bulk silicon edge.

Due to the low thermal conductivity of the

membrane, absorbed heat will cause the

temperature to increase more at the center of the

membrane than at the edge above the bulk. This

temperature difference is converted to an electric

potential by the thermo-electric effect in the

thermopile junctions. No supply voltage is needed.

The sensor IC is integrated together with a PTC

thermistor in one silicon mass. The PTC is adjacent

to the cold junctions of the thermopile. As such, use

of the PTC is considered the more accurate method

of measuring thermopile cold junction temperature,

and thus overall sensor accuracy when making non-

contact temperature measurement.

The sensor and thermistor can be used independent

of each other if desired, as the thermopile potential

is floating.

MLX90247B Discrete Infrared Sensor IC

Page 1

Rev 1.0 17/Feb/01

12 3 4

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