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Analog and Interface Product Solutions

Temperature Sensor Design Guide
Temperature Measurement Solutions for Silicon IC Temperature
Sensor, Thermocouple, RTD and Thermistor-Based Applications

Design ideas in this guide use the following devices.
A complete device list and corresponding data sheets
for these products can be found at 
Voltage Output
Temperature Sensors

Logic Output
Temperature Sensors

MCP9700
MCP9701
MCP9700A
MCP9701A
TC1046
TC1047A

TC620
TC621
TC622
TC623
TC624

TC6501
TC6502
TC6503
TC6504

Serial Output
Temperature Sensors
MCP9800
MCP9801
MCP9802
MCP9803
MCP9805
MCP98242

TC72
TC74
TC77
TCN75
TCN75A

Comparators and
Operational Amplifiers
TC913A
TC7650
TC7652
MCP616
MCP6541
MCP6542
MCP6543

MCP6544
MCP6001
MCP6021
MCP6231
MCP6271
MCP6281
MCP6291

PGA
MCP6S21
MCP6S22
MCP6S24
MCP6S28



Temperature Sensor Design Guide

TEMPERATURE SENSORS – OVERVIEW
In many systems, temperature control is fundamental. There
are a number of passive and active temperature sensors
that can be used to measure system temperature, including:
thermocouple, resistive temperature detector, thermistor
and silicon temperature sensors. These sensors provide
temperature feedback to the system controller to make
decisions such as, over-temperature shutdown, turn-on/off
cooling fan, temperature compensation or general purpose
temperature monitor.
Microchip offers a broad portfolio of thermal management
products, including Logic Output, Voltage Output and Serial
Output Temperature Sensors. These products allow the
system designer to implement the device that best meets their
application requirements. Key features include high accuracy,
low power, extended temperature range and small packages.
In addition, Microchip’s linear products can be used to support
Thermocouple, RTD and Thermistor applications.

Common Methods of Interfacing a Sensor

Sensor

Volts

Serial Output

OFF ON

RTD

Fan
C

-

Thermocouple,
Thermistor/Amplifiers

Thermocouples
VOUT

Thermocouples are usually selected because of their wide
temperature range (as low as -270°C to as high as 1750°C),
ruggedness and price; however, they are highly non-linear and
often require significant linearization algorithms. In addition,
the voltage output of this temperature sensing element is
relatively low when compared to devices that can convert
voltage signals to a digital representation. Consequently,
analog gain stages are required in the circuit.

MCP6541

VDD
R

R

R
...
Voltage Output
Temperature Sensors
Logic Output
Temperature Sensors
Serial Output
Temperature Sensors
Comparators and
Operational Amplifiers PGA
MCP9700
MCP9701
MCP9700A
MCP9701A
TC1046
TC1047A
TC620
TC621
TC622
TC623
TC624
TC6501
TC6502
TC6503
TC6504
MCP9800
MCP9801
MCP9802
MCP9803
MCP9805
MCP98242
TC72
TC74
TC77
TCN75
TCN75A
TC913A
TC7650
TC7652
MCP616
MCP6541
MCP6542
MCP6543
MCP6544
MCP6001
MCP6021
MCP6231
MCP6271
MCP6281
MCP6291
MCP6S21
MCP6S22
MCP6S24
MCP6S28
Temperature Sensor Design Guide
Temperature Measurement Solutions for Silicon IC Temperature
Sensor, Thermocouple, RTD and Thermistor-Based Applications
www.microchip.com/analog
Design ideas in this guide use the following devices.
A complete device list and corresponding data sheets
for these products can be found at
www.microchip.com.
Analog and Interface Product Solutions
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