BL0940

Part: BL0940

Type: Calibration-Free Energy Metering IC

Description: Single-phase energy metering IC with dual Sigma-Delta ADCs, integrated 1.218 V reference, and SPI/UART interfaces for measuring RMS voltage, RMS current, active power, and temperature.

Operating Conditions:

• Supply voltage: 3.0–3.6 V (3.3 V typical)
• Operating temperature: -40 to +85 °C
• Power consumption: 10 mW typical (3 mA at VDD = 3.3 V)

Absolute Maximum Ratings:

• Max supply voltage: -0.3 to +4 V
• Max junction/storage temperature: -55 to +150 °C

Key Specs:

• Internal voltage reference: 1.218 V
• Current channel differential input: ±50 mV peak (35 mV rms) max
• Voltage channel differential input: ±100 mV (70 mV rms) / ±200 mV peak max
• Analog input impedance: 370 kΩ
• Active energy measurement accuracy: 0.2% (35 A to 100 mA @ 1 mΩ shunt)
• Current RMS measurement accuracy: 0.2% (35 A to 100 mA @ 1 mΩ shunt)
• Fast RMS response time: 10 to 40 ms (50 Hz), 8.3 to 33 ms (60 Hz)
• Zero-crossing output delay: 571 μs

Features:

• Dual independent Sigma-Delta ADCs for current and voltage
• Calibration-free with batch factory gain error under 1%
• Measures RMS current, RMS voltage, fast RMS current, active power, and phase angle
• Leakage and overcurrent monitoring on current channel with configurable threshold
• Built-in waveform register (7.8 kHz update rate) for load type analysis
• Integrated temperature sensor for internal and external temperature monitoring
• Power-down reset monitoring (trips below 2.7 V)
• SPI (up to 900 kHz) and UART (4800 bps) digital interfaces

Applications:

• Single-phase multi-function energy meters
• Smart plugs / smart sockets
• Smart home appliances
• Electric bicycle charging stations
• Power consumption data acquisition

Package:

• TSSOP14