BL0940

Part: BL0940

Type: Energy Metering IC

Description: BL0940 is a calibration-free energy metering chip for single-phase multi-function energy meters, smart sockets, smart home appliances, and electric bicycle charging piles, integrating two high-precision Sigma-Delta ADCs and digital signal processing circuits to measure current, voltage RMS, active power, and active energy.

Operating Conditions:

• Supply voltage: 3–3.6 V
• Current RMS measurement range: 10mA–35A @ 1mΩ
• Active energy measurement range: 1W–7700W @ 1mΩ, 220V

Key Specs:

• Supply voltage (VDD): 3 V (min), 3.6 V (max)
• Power consumption (Iop): 3 mA (typical) @ VDD=3.3V
• Current RMS measurement range: 10mA–35A @ 1mΩ
• Active energy measurement range: 1W–7700W @ 1mΩ, 220V
• Batch factory gain error: < 1%
• Built-in reference voltage: 1.218 V
• Built-in oscillator clock: ~4 MHz

Features:

• Two independent Sigma-Delta ADCs for current and voltage.
• Outputs current, voltage RMS, fast current RMS, active power, current/voltage waveform phase angle.
• Batch factory gain error less than 1%, enabling calibration-free operation under certain conditions.
• Current channel with configurable leakage/overcurrent monitoring thresholds and response time.
• Voltage zero-crossing signal output.
• Built-in waveform register for load type analysis.
• Integrated temperature sensor for over-temperature monitoring, alarm, and ambient temperature measurement.
• Integrated SPI (up to 900KHz) and UART (4800bps) communication.
• Power-down monitoring, chip resets below 2.7V.
• Built-in 1.218V reference voltage source.
• Built-in oscillator circuit, clock approximately 4MHz.
• Single 3.3V operating supply, low power 10mW (typical).
• Patented anti-creep design for active power.

Applications:

• Single-phase multi-function energy meters
• Smart sockets
• Smart home appliances
• Electric bicycle charging piles
• Electricity information big data acquisition

Package:

• TSSOP14