BL BL6552

BL6552 is a 7-channel three-phase energy monitoring and analysis IC, suitable for applications such as three-phase smart circuit breakers, three-phase DIN rail meters, electrical measuring instruments, and power monitoring of high-power equipment, offering a high cost-performance ratio.

The BL6552 integrates seven high-precision Sigma-Delta ADCs, reference voltage circuits, temperature sensors, and other analog circuit modules, along with digital signal processing circuits for computing electrical parameters such as power, RMS, energy, and temperature. It supports measurement of total (fundamental and harmonic) active power and energy, reactive power and energy, and apparent power and energy for each phase and combined phases of a three-phase system, as well as fundamental active power and energy, reactive power and energy, per-phase current and voltage RMS values, power factor, and other parameters. It also features power quality management functions including current loss detection, current and voltage peak detection, and zero-crossing detection, and is capable of providing real-time waveforms.

The BL6552 integrates SPI and UART interfaces, facilitating the transfer of metering parameters and calibration parameters between the device and an external MCU.

The BL6552 employs a data-stream computation architecture internally to process various signals, providing excellent reliability under external interference conditions. An internal supply voltage monitoring circuit ensures normal operation during power-up and power-down sequences.

• High accuracy: active power nonlinearity error < 0.1% over 8000:1 input dynamic range
• High stability: output pulse jitter < 0.02% (ωIb) over 8000:1 input dynamic range
• Neutral current input sampling
• Per-phase and total (fundamental + harmonic) active, reactive, and apparent power (24-bit, two calculation methods supported); fundamental active and reactive power (24-bit)
• Per-phase voltage and current RMS (24-bit), relative error < 0.1% over 3000:1 detection range
• Per-phase voltage, current, and neutral current waveform sample data (24-bit)
• Total (fundamental + harmonic) active, reactive, and apparent energy (24-bit)
• Total (fundamental + harmonic) active and reactive line-cycle energy
• Total (fundamental + harmonic) forward and reverse active energy
• Combined-phase and four-quadrant reactive energy
• 300-point real-time waveform per cycle
• Power factor output
• Fast RMS output
• Voltage-current phase angle measurement
• Fast pulse output for active and reactive energy
• Voltage sag and phase-loss detection
• Current loss detection
• Current and voltage peak detection and zero-crossing detection
• Frequency detection
• Programmable anti-creep threshold setting
• Programmable pulse output frequency adjustment
• Programmable active, reactive, and apparent power error and gain adjustment
• Programmable active power phase compensation input
• Configurable interrupt request signal for external MCU control
• UART/SPI communication interface for data transfer
• Built-in 1.2V reference voltage source
• Single supply 3.3V
• QFN36 package

• Three-phase smart circuit breaker
• Three-phase DIN rail meter
• Electrical measuring instrument
• High-power equipment power monitoring