2-pin digital output temperature sensor that replaces NTC.Infrared sensing module direct sales

　　The traditional NTC thermistor has low cost and simple wiring, and is easy to be used as a temperature probe. It is widely used in consumer electronics, household appliances, industry, and the Internet of Things. However, NTC thermistors usually have a large nonlinearity, and can only guarantee a certain accuracy in a narrow temperature range, and the measurement accuracy in a slightly larger temperature range will be greatly reduced. In addition, in order to convert the resistance value into a temperature value, the system needs to be equipped with a high-precision reference resistance, and the MCU needs to provide an ADC with more than 12 bits, and use a look-up table to calculate the temperature value corresponding to the resistance, which increases the system cost and The complexity of the operation. In view of the above factors, it has become the preferred choice for developers to replace traditional NTC thermistors with a high-precision, low-cost, and easy-to-operate temperature sensor solution.

　　Nanochip's low-power digital output temperature sensor chip NST1001 has only two pins - GND and DQ, which can directly replace traditional NTC resistors without changing peripheral circuits. When the chip is working, after connecting to DQ through a pull-up resistor, it will periodically send out a pulse signal on the DQ pin, and the MCU can directly get the temperature reading by counting the pulse signal through a GPIO, which greatly simplifies the circuit. hardware facilities. Each NST1001 chip is calibrated before leaving the factory, the error is <±0.5°C at -20°C ~85°C, the error is <±0.75°C in the range of -50°C~-20°C, and the error is <±0.75°C at 85°C. Error <±0.75°C at ℃~150°C. NST1001 can adapt to a wide operating voltage range of 1.65V~5.5V, the current is only 30uA during temperature conversion, and the current is only 1uA during pulse output, with almost no self-heating effect. Zero standby power consumption can be achieved when using GPIOs to power the pull-up resistors. The above features make NST1001 very suitable for temperature monitoring of low-power IoT nodes, such as cold chain transportation, grain monitoring, industrial IoT, etc.

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