July 7, 2026 – Austin, TX – Silicon Labs Streamlines Wireless PIR Design
Silicon Labs has announced the EFR32xG28-PIR, a new wireless SoC that integrates a PIR analog front-end with a low-power radio, enabling single-chip wireless motion sensors with 10+ year battery life.
Key Features
- Integrated PIR AFE: Dual-channel PGA (40-80dB), 16-bit ADC
- AI accelerator: 20 GOPS for on-device motion classification
- Radio: Bluetooth LE, Zigbee, Thread, Matter, proprietary
- Power: 3 µA sleep (PIR monitoring), 5 µA deep sleep
- Supply voltage: 1.8V to 3.8V
- Package: 5mm × 5mm QFN
- Price: $2.49 (10,000 units)
Integrated Motion Classification
The SoC includes a dedicated neural network accelerator that can run pre-trained models for:
- Human vs. pet discrimination
- Activity recognition (walking, running, falling)
- Environmental noise rejection
- False trigger filtering
“The EFR32xG28-PIR eliminates the need for external op-amps and comparators,” said Matt Saunders, VP of IoT Products. “This reduces BOM cost by 40% and PCB area by 60%.”
Availability
Samples are available now, with volume production scheduled for Q1 2027. Evaluation boards are available for $79.