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The MCP9700/9700A and MCP9701/9701A family ofLinear AcTIve Thermistor™ Intergrated Circuit (IC) is ananalog temperature sensor that converts temperatureto analog voltage. It’s a low-cost, low-power sensorwith an accuracy of ±2°C from 0°C to +70°C(MCP9700A/9701A) ±4°C from 0°C to +70°C(MCP9700/9701) while consuming 6 μA (typical) ofoperaTIng current.Unlike resisTIve sensors (such as thermistors), theLinear AcTIve Thermistor IC does not require anadditional signal-conditioning circuit. Therefore, thebiasing circuit development overhead for thermistorsolutions can be avoided by implementing this low-costdevice. The voltage output pin (VOUT) can be directlyconnected to the ADC input of a microcontroller. TheMCP9700/9700A and MCP9701/9701A temperaturecoefficients are scaled to provide a 1°C/bit resolutionfor an 8-bit ADC with a reference voltage of 2.5V and5V, respectively.The MCP9700/9700A and MCP9701/9701A provide alow-cost solution for applications that require measurementof a relative change of temperature. When measuringrelative change in temperature from +25°C, anaccuracy of ±1°C (typical) can be realized from 0°C to+70°C. This accuracy can also be achieved by applyingsystem calibration at +25°C.In addition, this family is immune to the effects ofparasitic capacitance and can drive large capacitiveloads. This provides Printed Circuit Board (PCB) layoutdesign flexibility by enabling the device to be remotelylocated from the microcontroller. Adding somecapacitance at the output also helps the outputtransient response by reducing overshoots orundershoots. However, capacitive load is not requiredfor sensor output stability.
