Reflowable PIR sensor minimizes false triggers with integrated signal processing
The Murata IRS-D200ST00R1 is a surface-mount digital pyroelectric infrared (PIR) sensor module which integrates amplification and signal processing functions, providing reliable human presence detection in small IoT and security devices.
The highly integrated IRS-D200ST00R1 PIR sensor from Murata enables developers to save power and space in battery-powered devices such as smart doorbells.
Unlike traditional analogue PIR sensors which require external operational amplifiers and passive components, the IRS-D200ST00R1 integrates the pyroelectric element, a pre-amplifier, an ADC, and a DSP into a single lens-less ceramic package measuring 6.0mm x 6.0mm x 2.6mm. This greatly reduces board footprint and simplifies the circuit design.
Drawing operating current of 8μA, the IRS-D200ST00R1 provides for long battery run-times in wireless applications. An I2C interface enables the host system to configure sensitivity settings and thresholds. Designers can use an interrupt function to enable a host microcontroller to remain in a low-power sleep mode until motion is detected, helping to minimize overall power usage.
Internal signal processing logic allows the designer to configure variable filter characteristics, which helps to distinguish valid motion signals from environmental noise. The IRS-D200ST00R1 offers high immunity to RF interference, lowering the likelihood of false triggers in connected smart home and security environments.