BL0937B

BL0937B is a wide-range single-phase multi-function energy metering IC, suitable for single-phase socket meters, single-phase power strips, smart home appliance control circuits, and other applications, offering high cost-effectiveness. BL0937B integrates two high-precision Sigma-Delta ADCs, reference voltage, power management, and other analog circuit modules, along with digital signal processing circuits for calculating active power, RMS current/voltage, and other electrical parameters. A high-frequency CF1 output is provided for indicating RMS current/voltage, and a high-frequency CF output for energy metering. BL0937B is capable of measuring single-phase active energy, active power, RMS current/voltage, and other parameters, fully meeting the requirements of socket meters, single-phase power strips, smart home appliances, and related applications. BL0937B features a patented anti-creep design, combined with appropriate external hardware design.

Applications

• Single-phase socket meter
• Single-phase power strip
• Smart home appliance control circuit

Key features

• High accuracy: nonlinearity measurement error < ±0.5% over 2500:1 input dynamic range
• Large-signal stability: CF output jitter < ±0.2% at 300mA sampling current
• Small-signal stability: CF jitter < ±0.3% at 50mA sampling current
• On-chip RMS voltage and current output; current measurement range (4mA~30A) @1mΩ
• Anti-creep design ensures noise power cutoff when no current is present
• On-chip power supply monitoring circuit for brownout detection; chip enters reset state when supply voltage drops below 2.6V
• On-chip 1.1V reference voltage (typical)
• On-chip oscillator circuit; no external crystal required
• Single 3.3V supply; low power consumption 8mW (typical)
• SOP8 package