Temperature sensor IC with ±0.5℃ accuracy and pulse count interface.
The "CT1721" is a temperature sensor IC with a pulse count interface. The application only requires an external pull-up resistor. The DIO pin of this chip can be directly connected to the GPIO pin of the MCU, and since devices in single conversion mode do not require MCU timer resources, it can reduce the software overhead of the MCU. Additionally, it integrates a bandgap circuit, an AD converter, and a digital interface, providing an open-drain output. The DIO pin serves both as a power supply and a digital pulse output (open-drain). When the DIO pin is powered through a pull-up resistor, the chip begins temperature measurement and continues to send temperature data via pulse count until the MCU pulls the DIO pin low. This chip can connect up to nine sensors to the same MCU I/O pin, distinguished by an address code (set by the user using the AD0 and AD1 pins). It also supports temperature measurement in either single conversion or continuous conversion mode.
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basic information
【Specifications (Partial)】 ■ Operating Voltage (DIO Pin): 1.4V to 5.5V ■ Conversion Current: 36μA ■ Temperature Accuracy: - Maximum ±0.5℃ in the range of -10℃ to 80℃ - Maximum ±1.0℃ in the range of -50℃ to 150℃ Temperature Resolution: 0.0625℃ or 0.1℃ Output Temperature Data: Proportional to pulse count Temperature Conversion Time: 14ms Temperature Data Transmission Time: 38ms Single Pulse Cycle Time: 8.6μs ■ Up to 9 sensors can be connected to the same I/O pin of the MCU, allowing simultaneous monitoring of 9 zones Temperature Range: -50℃ to 150℃ * For more details, please download the PDF or feel free to contact us.
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■Home appliances ■HVAC (Heating, Ventilation, and Air Conditioning) system ■IoT devices
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