NTC Thermistor
Evaluation Board: MTHMR-N-0002A
Quick Start Guide 
Evaluation Board: MTHMR-N-0002A
- The Evaluation Board can be utilized for testing temperature sensors (NTC Thermistor; NXFT-series).
- It’s a simple way to test temperature sensing by connecting this board with your microcomputer or single-board computer. Because this is an integrated Thermistor and peripheral circuit.
Specifications
- Rated Voltage: 5V
- Output signal: analog
- Dimension: 15×10mm
NTC Thermistor
A thermistor is a resistive component whose resistance value varies in response to its temperature. NXFT15XH103FA2B030 as a standard item for the starter kit has 10kohm at 25degC.
Hardware & Software Operation
On the board, Vcc (3.3V ~ 5V) is applied to the thermistor and reference register (6.2kohm) and divided voltage is obtained at OUT.
Intaking OUT into ADC port and applying approximation formula, we obtain temperature value.
Calculation Example :
V = V(out) = (ADC_reading / ADC_resolution) * Vcc (in case of Arduino : ADC_resolution is 1023, due to 10bit ADC.)
Applox. Formula:
Temp [degC] = -0.30779 * V^5 + 4.1545 * V^4 – 23.272 * V^3 + 68.015 * V^2 – 126.35 * V + 160.42. (condition : 6.2kohm ref-resistor, 5V input)
Pin Connection
Pin connection to each CPU board is also instructed in the sample code.
| Evaluation Board | Arduino UNO |
| VCC | 5V |
| OUT | A0 |
| GND | GND |
Copyright © Murata Manufacturing Co., Ltd. All rights reserved.
19 June 2017
