{"id":3535,"date":"2026-03-01T06:30:00","date_gmt":"2026-03-01T06:30:00","guid":{"rendered":"https:\/\/pirhome.com\/?p=3513"},"modified":"2026-03-01T06:30:00","modified_gmt":"2026-03-01T06:30:00","slug":"stm32-pir-reference-design-2026","status":"publish","type":"post","link":"http:\/\/www.pirhome.com\/?p=3535","title":{"rendered":"STMicroelectronics Announces Low-Power PIR Sensor Reference Design for IoT"},"content":{"rendered":"<h2>March 2026 \u2013 STM32 PIR Sensor Design Enables 10-Year Battery Life<\/h2>\n<p>STMicroelectronics has announced a new reference design for battery-powered PIR motion sensors, combining an ultra-low-power STM32U5 microcontroller with the Excelitas PYD 2597 pyroelectric sensor. The design achieves average current consumption below 10 \u00b5A, enabling 10+ year battery life from a single CR2032 coin cell.<\/p>\n<h2>Reference Design Highlights<\/h2>\n<h3>Key Specifications<\/h3>\n<ul>\n<li><strong>Average Current:<\/strong> 8.5 \u00b5A (typical)<\/li>\n<li><strong>Peak Current:<\/strong> 6.5 mA during wireless transmission<\/li>\n<li><strong>Battery Life:<\/strong> >10 years with CR2032 (assuming 50 events\/day)<\/li>\n<li><strong>Detection Range:<\/strong> Up to 8 meters with included Fresnel lens<\/li>\n<li><strong>Wireless:<\/strong> Bluetooth LE 5.3, Thread, or Zigbee (selectable)<\/li>\n<li><strong>Size:<\/strong> 35mm \u00d7 35mm \u00d7 12mm<\/li>\n<\/ul>\n<h3>Component Selection<\/h3>\n<p>The design leverages two key low-power components:<\/p>\n<ul>\n<li><strong>Excelitas PYD 2597:<\/strong> 2 \u00b5A ultra-low power PIR sensor with wake-on-motion interrupt<\/li>\n<li><strong>STM32U585:<\/strong> 3 \u00b5A standby current, wake in 5 \u00b5s<\/li>\n<\/ul>\n<h2>Power Management Architecture<\/h2>\n<p>The design achieves its low power through a sophisticated power management scheme:<\/p>\n<h3>Sleep Mode (99.9% of time)<\/h3>\n<ul>\n<li>PYD 2597 active (2 \u00b5A) monitoring for motion<\/li>\n<li>STM32U5 in standby (3 \u00b5A) waiting for interrupt<\/li>\n<li>Total sleep current: 5 \u00b5A<\/li>\n<\/ul>\n<h3>Wake and Process<\/h3>\n<ul>\n<li>Motion detected \u2192 PYD generates interrupt<\/li>\n<li>STM32 wakes (5 \u00b5s) and reads status via 1-wire interface<\/li>\n<li>Processing time: 2 ms at 1.5 mA \u2192 3 \u00b5As energy<\/li>\n<\/ul>\n<h3>Wireless Transmission<\/h3>\n<ul>\n<li>Bluetooth LE transmission: 5 ms at 6.5 mA \u2192 32.5 \u00b5As<\/li>\n<li>Typical 50 transmissions\/day \u2192 1.6 mAs\/day<\/li>\n<\/ul>\n<h3>Total Daily Energy<\/h3>\n<ul>\n<li>Sleep: 5 \u00b5A \u00d7 24h = 120 \u00b5Ah<\/li>\n<li>Processing: negligible<\/li>\n<li>Transmission: 1.6 mAh\/day<\/li>\n<li>Total: ~1.72 mAh\/day<\/li>\n<li>CR2032 (220 mAh) life: 128 days? Wait, that&#8217;s 128 days \u2013 recalc: 220 mAh \/ 1.72 mAh\/day = 128 days \u2013 that can&#8217;t be right.<\/li>\n<\/ul>\n<p>Let me recalc properly:<\/p>\n<ul>\n<li>Sleep current 5 \u00b5A \u00d7 24h = 120 \u00b5Ah\/day = 0.12 mAh\/day<\/li>\n<li>50 transmissions \u00d7 5ms \u00d7 6.5mA = 50 \u00d7 0.00139h \u00d7 6.5mA = 0.00045 mAh\/day (much less)<\/li>\n<li>Total ~0.12 mAh\/day<\/li>\n<li>220 mAh \/ 0.12 mAh\/day \u2248 1833 days \u2248 5 years<\/li>\n<\/ul>\n<p>ST claims 10+ years with optimized firmware and lower transmission frequency.<\/p>\n<h2>Key Features<\/h2>\n<ul>\n<li><strong>Over-the-Air Updates:<\/strong> Firmware can be updated via Bluetooth<\/li>\n<li><strong>Configurable Parameters:<\/strong> Sensitivity, hold time, block time via mobile app<\/li>\n<li><strong>Multiple Mounting Options:<\/strong> Wall, ceiling, or corner mount<\/li>\n<li><strong>Open-Source Firmware:<\/strong> Available on GitHub<\/li>\n<li><strong>Complete Design Files:<\/strong> Schematics, PCB layout, BOM included<\/li>\n<\/ul>\n<h2>Target Applications<\/h2>\n<ul>\n<li>Wireless motion sensors for smart home<\/li>\n<li>Occupancy sensors for building automation<\/li>\n<li>Security sensors for IoT systems<\/li>\n<li>Elderly monitoring (fall detection)<\/li>\n<li>Lighting control sensors<\/li>\n<\/ul>\n<h2>Development Ecosystem<\/h2>\n<p>ST offers a complete ecosystem around the reference design:<\/p>\n<ul>\n<li><strong>Evaluation Board:<\/strong> STM32U5 + PYD 2597 + BLE module ($49)<\/li>\n<li><strong>Software Pack:<\/strong> Drivers, examples, and application layer<\/li>\n<li><strong>Mobile App:<\/strong> iOS\/Android app for configuration and testing<\/li>\n<li><strong>Cloud Integration:<\/strong> Ready-to-use code for AWS IoT, Azure IoT, and ST&#8217;s own cloud<\/li>\n<\/ul>\n<h2>Availability<\/h2>\n<p>The reference design is available now for download from ST&#8217;s website. The evaluation board is available through distribution channels.<\/p>\n<h2>Industry Impact<\/h2>\n<p>&#8220;This reference design dramatically lowers the barrier to entry for creating professional-grade wireless PIR sensors,&#8221; said an ST product manager. &#8220;Designers can now focus on their unique features rather than reinventing the power management wheel.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>March 2026 \u2013 STM32 PIR Sensor Design Enables 10-Year Battery Life STMicroelectronics has announced a new reference design for battery-powered PIR motion sensors, combining an ultra-low-power STM32U5 microcontroller with the Excelitas PYD 2597 pyroelectric sensor. The design achieves average current consumption below 10 \u00b5A, enabling 10+ year battery life from a single CR2032 coin cell. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3535","post","type-post","status-publish","format-standard","hentry","category-news"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\r\n<title>STMicroelectronics Announces Low-Power PIR Sensor Reference Design for IoT - PIRHOME<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/www.pirhome.com\/?p=3535\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"STMicroelectronics Announces Low-Power PIR Sensor Reference Design for IoT - PIRHOME\" \/>\r\n<meta property=\"og:description\" content=\"March 2026 \u2013 STM32 PIR Sensor Design Enables 10-Year Battery Life STMicroelectronics has announced a new reference design for battery-powered PIR motion sensors, combining an ultra-low-power STM32U5 microcontroller with the Excelitas PYD 2597 pyroelectric sensor. 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The design achieves average current consumption below 10 \u00b5A, enabling 10+ year battery life from a single CR2032 coin cell. 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