Bluetooth Smart Fingerprint Lock Solution (with Chip Recommendation)

As technology rapidly advances, smart home systems are becoming an integral part of modern life. Security remains the top priority in smart homes. Traditional mechanical locks suffer from vulnerabilities such as forced entry and key duplication, failing to meet today’s security demands. Consequently, an increasing number of households and commercial premises are adopting smart fingerprint locks as the preferred security solution.

Smart fingerprint locks not only retain the robustness of mechanical locks but also incorporate advanced biometric recognition and wireless communication technologies, delivering higher security and greater convenience. In today’s fast-paced world, users seek simpler and more efficient unlocking methods — and smart fingerprint locks perfectly fulfill this need. With the rapid growth of the smart home market, they have become a core component of home security and convenience.

Solution Overview

Most current Bluetooth smart fingerprint locks use a three-chip architecture: MCU + fingerprint sensor + Bluetooth module, where the MCU runs the fingerprint algorithm and Bluetooth handles communication. This approach results in higher cost.

ONMICRO’s single-chip solution OM6621PW stands out with outstanding performance and innovative technology. It integrates fingerprint processing and Bluetooth communication on a single chip while supporting third-party fingerprint algorithms, providing a more secure and convenient smart lock solution for both residential and enterprise users.

Solution Advantages

ARM Cortex-M4F Core

Stable performance, mature ecosystem, and developer-friendly debugging.

High Computing Power & Performance

Up to 128 MHz clock, 392 KB RAM, floating-point unit — easily handles complex real-time algorithms. Successfully integrated with third-party fingerprint algorithms for instant “second-open” unlocking.

Large Storage Capacity

Up to 16 Mb Flash enables registration of a greater number of fingerprints.

Excellent Compatibility

Full-featured Bluetooth 5.1 stack, rigorously tested with thousands of mainstream smartphones, compatible with nearly all popular devices.

High Security

Built-in hardware random number generator and AES-128 encryption safeguard personal and property safety.

Strong ESD Resistance

Passes ±4 kV (HBM) and ±1 kV (CDM) ESD certification — no more winter static crashes.

Superior RF Performance

TX power up to +9 dBm, RX sensitivity –96 dBm @ 1 Mbps, ensuring stable data transmission even in complex RF environments.

Rich Peripheral Resources

Up to 50 GPIOs, UART, I²C, I²S, SPI, QDEC, ADC, battery charger, and more — fully meets diverse smart lock design requirements.