MCU Products
Professional microcontroller solutions for your applications
The BH66F2560 is a high-performance 8-bit RISC microcontroller specifically engineered for single-chip pulse oximeter applications. By integrating a complete SpO₂ Analog Front-End (AFE) and Smart LED Drivers directly into the chip, it requires no external analog components, significantly reducing BOM cost and PCB footprint for compact wearable designs.
Features a high-precision 12-bit ADC and a specialized SpO₂ AFE (containing Operational Amplifiers and two 12-bit DACs) for dynamic DC offset cancellation. The built-in Constant Current H-Bridge Driver allows software-adjustable current (0~75mA), ensuring precise control over Red/IR LEDs without external transistors.
Designed to meet medical standards, the BH66F2560 achieves SpO₂ accuracy of ±2%. Its advanced architecture supports calibration-free mass production (when using fixed-wavelength sensors), streamlining the manufacturing process and ensuring consistency.
With a standby current of just 0.45μA (Typ.), the device is optimized for long battery life (supporting 2×AAA). It includes 16K Flash, 1K RAM, and 1K EEPROM for data storage, along with UART, SPI, and I²C interfaces for seamless connection to OLED displays and Bluetooth modules.
Features
Fully Integrated SpO₂ AFE
- - Built-in SpO₂ receiving circuit featuring high-performance Operational Amplifiers (OPAMPs) and two 12-bit DACs for dynamic DC offset cancellation.
- - Requires no external active components, significantly reducing BOM cost and PCB footprint.
Smart H-Bridge LED Driver
- - Integrated constant current driver with 4-level software adjustment (0~75mA).
- - Directly drives Red and IR LEDs without external transistors, ensuring stable light emission for varying skin types.
Medical-Grade Precision
- - High-speed 12-bit SAR ADC delivers ±2% SpO₂ accuracy (Measurement Range: 35%~100%).
- - Supports reliable Perfusion Index (PI) measurement from 0.3% to 20%.
Calibration-Free Mass Production
- - Advanced algorithm design ensures no calibration is required as long as sensor wavelengths are fixed.
- - Simplifies the manufacturing process and reduces production time and equipment costs.
Ultra-Low Power Consumption
- - Typical standby current of 0.45μA (at 3V).
- - Optimized for battery-powered devices, supporting 2×1.5V (AAA) batteries for extended operation.
Flexible Interface
- - Memory: 16K×16 Flash Program Memory, 1024×8 RAM, and 1024×8 True EEPROM.
- - Interfaces: Integrated UART, SPI, and I²C for connecting Bluetooth/OLED modules; built-in LCD driver.
