Murata Introduces a Low-Power, Low-Profile Digital Pyroelectric Infrared Sensor

Murata Manufacturing has developed a new pyroelectric infrared sensor, the IRS-D200ST00R1, to address design challenges in low-power, battery-operated IoT applications. This sensor integrates an amplifier and an analog-to-digital converter (ADC) with digital output in a compact surface-mount device package for human motion detection. 

Murata’s IRS-D200ST00R1 is a digital output SMD pyroelectric infrared sensor with a compact profile of just 6 mm × 6 mm × 2.6 mm. Image used courtesy of Murata

SMD Type IRS-D200ST00R1

The SMD Type IRS-D200ST00R1 features a digital I2C interface, simplifying the overall circuit design by eliminating the need for external analog signal processing components. This reduces the bill of materials, board space, and engineering effort required for integration. By providing a direct digital output, the sensor can be easily connected to an MCU, allowing for more straightforward data acquisition and processing. The component operates on a low supply voltage range of 1.8 V to 3.3 V, which is critical for extending battery life in wireless devices.

The IRS-D200ST00R1 extends battery life with an interrupt signal function that activates the MCU only when human motion is detected. Image used courtesy of Murata

A Digital Pyroelectric Infrared Sensor

The IRS-D200ST00R1 employs a dual-element electrode design measuring 2.0 x 0.5 mm and a typical sensitivity of 19.5 mV, allowing for reliable human movement detection. The sensor’s high signal-to-noise ratio and noise resistance contribute to its high immunity against false detections, which can be an issue with PIR sensors in real-world environments. The compact package size of 6.0 x 6.0 x 2.6 mm enables high-density circuit designs, a necessity for the miniaturization of modern IoT devices.

The sensor offers a field of view of ±55∘ horizontally and ±42∘ vertically, providing a practical detection area for various applications. It operates over a temperature range of −25 °C to 80 °C, ensuring stable performance across a wide range of operating conditions. The combination of a low-power consumption and an interrupt function aids in reducing overall system power consumption, as the MCU can remain in a sleep state until a signal from the sensor triggers an interrupt.

The IRS-D200ST00R1 is purpose-built for human detection in IoT devices and smart systems for homes and buildings. Image used courtesy of Adobe Stock

Enhancing IoT Design

Murata’s new digital PIR sensor is engineered for applications where human presence or movement detection is required with a minimal power budget. The device’s digital output, small size, and robust performance against false positives make it well-suited for a variety of consumer and industrial products. Potential applications include battery-powered smart doorbells, wireless security cameras, smart lighting systems that activate upon entry, and presence detection for home automation systems and smart appliances.