Microchip Technology MCP970x Linear Active Thermistor ICs
Microchip MCP970x Linear Active Thermistor ICs are a low-cost, low-power family of analog temperature sensors that convert temperature to an analog voltage. Unlike resistive sensors, e.g., thermistors, the Linear Active Thermistor IC from Microchip Technology 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 VOUT pin can be directly connected to the ADC input of a microcontroller.
The MCP970x provides a low-cost solution for applications that require measurement of a relative change in temperature. When measuring relative change in temperature from +25°C, an accuracy of ±1°C (typical) can be realized from 0°C to +70°C. This accuracy can also be achieved by applying system calibration at +25°C.
In addition, this family of devices is immune to the effects of parasitic capacitance and can drive large capacitive loads. This provides printed circuit board (PCB) layout design flexibility by enabling the device to be remotely located from the microcontroller. Adding some capacitance at the output also helps the output transient response by reducing overshoots or undershoots. However, a capacitive load is not required for the stability of sensor output.
Features
- Tiny analog temperature sensor
- SC70-5, SOT-23-3, and TO-92-3 (not available with the MCP9700B) package options
- Wide temperature measurement range
- -40°C to +125°C (extended temperature)
- -40°C to +150°C (MCP9700 and MCP9700B; SOT-23-3 and SC70-5 only)
- Accuracy
- ±1°C (max.), +20°C to +70°C (MCP9700B)
- ±2°C (max.), 0°C to +70°C (MCP9700A/9701A)
- ±4°C (max.), 0°C to +70°C (MCP9700/9701)
- Optimized for analog-to-digital converters (ADCs)
- 10.0mV/°C (typical) (MCP9700/9700A/9700B)
- 19.5mV/°C (typical) (MCP9701/9701A)
- Wide operating voltage range
- VDD = 2.3V to 5.5V (MCP9700/9700A/9700B)
- VDD = 3.1V to 5.5V (MCP9701/9701A)
- 6µA (typical) low operating current
- Optimized to drive large capacitive loads
Applications
- Hard disk drives and other PC peripherals
- Entertainment systems
- Home appliance
- Office equipment
- Battery packs and portable equipment
- General-purpose temperature monitoring
Typical Application Circuit
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