TH09C Temp Sensor Breakout Board
Overview
The Boardoza TH09C is a precision temperature sensing module designed for applications demanding high accuracy and rapid thermal response. At its core lies a sensitive thermistor-based architecture, engineered to provide reliable temperature measurements across a broad environmental range.
Optimized for integration into embedded systems, this breakout board simplifies the analog interface by providing a standard 3-pin connection. It is suitable for both 3.3V and 5V logic environments, making it a versatile choice for HVAC monitoring, industrial process control, and consumer electronics thermal management.
Core Technical Specifications
The module is defined by the following operational parameters:
Sensing Element: High-precision NTC (Negative Temperature Coefficient) thermistor, typically 10kΩ at 25°C, where resistance decreases as temperature increases.
Temperature Range: Capable of measuring temperatures from -40°C to +125°C, covering most industrial and consumer application requirements.
Accuracy: Provides a measurement tolerance of ±1%, ensuring consistent data fidelity for critical thermal loops.
B-Constant: Characterized by a Beta value (B25/50) of 3950K, defining the slope of the resistance-temperature curve for software linearization.
Output Type: Analog voltage output proportional to the temperature, designed for direct connection to an MCU ADC pin.
Operating Voltage: Supports a flexible supply input of 3.3V to 5V DC.
Physical Dimensions: A compact 20 mm x 40 mm PCB footprint.
Key Engineering Features
Linearized Analog Output
While raw thermistors exhibit a non-linear resistance response, this breakout board is typically configured as a voltage divider circuit. This setup produces an analog voltage output that can be easily mapped to temperature values using the Steinhart-Hart equation or simplified Beta parameter calculations in the host microcontroller firmware.
Wide Operational Envelope
The sensor's wide operating temperature range (-40°C to +125°C) allows it to be deployed in harsh environments, from freezing outdoor weather stations to the high-heat interiors of power supply enclosures. Its ±1% accuracy ensures that it meets the rigorous standards required for safety-critical thermal shutdowns.
Simplified Interface
The module is designed for "plug-and-measure" simplicity. By handling the mechanical mounting and electrical termination of the discrete thermistor component, it provides a robust, vibration-resistant platform that eliminates the need for point-to-point wiring or custom signal conditioning on the main PCB.
Hardware Interface and Signal Mapping
The module interfaces via a standard 3-pin header, labeled for quick identification:
Power and Signal
VCC (Signal Pin): This pin serves as the signal output. In a typical voltage divider configuration on the breakout, the output voltage at this pin varies with temperature. It is connected to the ADC input of the microcontroller.
GND: Common system ground.
(Third Pin): Depending on the specific voltage divider topology used on the board, the third pin (often labeled VCC or similar) provides the bias voltage (3.3V or 5V) to the thermistor circuit.
(Note: Ensure to verify the specific pinout labels on the silk screen, as NTC breakout topologies can vary between VCC-Signal-GND).
Applications
HVAC Systems: Air duct temperature monitoring for climate control feedback loops.
3D Printers: Heated bed and hot-end temperature regulation.
Battery Management Systems (BMS): Thermal runaway detection for Li-Ion battery packs.
PC Hardware: Case and CPU temperature monitoring for fan speed control.
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