MCP9700 - low-power linear active thermistor IC

The MCP9700 can accurately measure temperature from -40C to +150C. The output of the MCP9700 is calibrated to a slope of 10mV/°C and has a DC offset of 500mV. The offset allows reading negative temperatures without the need for a negative supply. The MCP9700 is packaged in space saving 5-pin SC-70 packages, making it ideal for space-critical and low-cost applications.

MCP9700/9700A and MCP9701/9701A sensors with Linear Active Thermistor Integrated Circuit (IC) comprise a family of analog temperature sensors that convert temperature to analog voltage. The low-cost, low-power sensors feature an accuracy of ±2°C from 0°C to +70°C (MCP9700A/9701A) and ±4°C from 0°C to +70°C (MCP9700/9701) while consuming 6 µA (typical) of operating current.

Unlike resistive sensors, e.g., thermistors, the Linear Active Thermistor IC does not require an additional signal-conditioning circuit. Therefore, the biasing circuit development overhead for thermistor solutions can be avoided by implementing a sensor from these low-cost devices. The Voltage Output pin (VOUT) can be directly connected to the ADC input of a microcontroller. The MCP9700/9700A and MCP9701/9701A temperature coefficients are scaled to provide a 1°C/bit resolution for an 8-bit ADC with a reference voltage of 2.5V and 5V, respectively. The MCP9700/9700A output 0.1°C/bit for a 12-bit ADC with 4.096V reference.

Features

• Linear Temperature Slope: 10mV/°C
• ±4°C Accuracy from 0°C to +70°C
• -4°C/+6°C Accuracy from -40°C to +150°C
• Very low Operating Current: 12µA (max)
• Operates from 2.3V to 5.5V
• No external Components Required
• Space-saving SC-70 Package
• AEC-Q100 Qualified Grade 0

Applications

• Hard disk drives and other PC peripherals
• Entertainment systems
• Home appliance
• Office equipment
• Battery packs and portable equipment
• General purpose temperature monitoring

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• Microchip Low-Power Linear Active Thermistor ICs