MLX90247B Ver la hoja de datos (PDF) - Melexis Microelectronic Systems
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MLX90247B Datasheet PDF : 4 Pages
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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.
MLX90247B
Description
Thermopile with On-chip PTC Thermistor
Functional Diagram
ϑ+
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
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