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MCP9700AT-E/TT

MCHPMCP9700AT-E/TT

Microchip Technology
Low-cost analog temperature sensor family from Microchip suitable for board- and system-level temperature monitoring.
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Overview

The MCP9700AT-E/TT is a low-power, linear active thermistor IC that converts temperature to an analog voltage. It provides a typical sensitivity of 10mV/degree C with an offset of 500mV at 0 degrees C, allowing it to measure negative temperatures without a negative supply. This sensor is specifically optimized for interfacing with ADCs in battery-powered applications due to its extremely low 6uA typical operating current.

Why Choose This Part

This sensor eliminates the need for external signal-conditioning circuitry or complex lookup tables required by passive thermistors. It is designed to drive large capacitive loads and operates across a wide supply voltage range of 2.3V to 5.5V, making it highly compatible with both 3.3V and 5V logic systems.

Applications

Battery Management Systems
Monitoring cell temperatures in portable electronics due to the ultra-low current consumption.
Hard Disk Drives and Peripherals
Localized thermal monitoring in space-constrained consumer electronics.
General Purpose Temperature Monitoring
Providing feedback for fan control or thermal compensation in power supply circuits.
Appliance Thermal Control
Used in white goods for ambient or internal temperature sensing between -40C and +125C.

Key Specifications

Resolution 10mV/degC
Output Type Analog Voltage
Sensor Type Analog, Local
Mounting Type Surface Mount
Package / Case TO-236-3, SC-59, SOT-23-3
Test Condition 0degC ~ 70degC (-40degC ~ 125degC)
Voltage - Supply 2.3V ~ 5.5V
Operating Temperature -40degC ~ 125degC
Supplier Device Package SOT-23-3
Accuracy - Highest (Lowest) +/-2degC (-2degC, +4degC)
Sensing Temperature - Local -40degC ~ 125degC

Getting Started

To use this part, connect the VDD and GND pins to a stable power source and the VOUT pin directly to a microcontroller ADC input. Use the linear transfer function where Temperature = (Vout - 500mV) / 10mV to calculate the Celsius value. No external components are required for operation, though a 0.1uF bypass capacitor on VDD is recommended for noise rejection.

Also Consider

TMP36 Analog Devices - Offers a similar 10mV/degree C linear output but with a different voltage offset, widely used in educational hobbyist kits.
LM35 TITexas Instruments - Provides an output directly proportional to the Celsius temperature scale without an offset, though it requires a negative supply for sub-zero sensing.
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