BL0940

Part: BL0940

Type: Calibration-Free Metering Chip

Key Specs:

• Current RMS range: 10mA~35A @ 1mOhm
• Active Energy range: 1W~7700W @ 1mOhm @ 220V
• Power Supply (VDD): 3.0V to 3.6V
• Power Consumption: 10mW (typical)
• Operating Current: 3mA (typical) @ VDD=3.3V
• Active Energy Measurement Accuracy (Large Signal): 0.2% (typical)
• RMS Measurement Accuracy (Large Signal): 0.2% (typical)
• SPI maximum speed: 900KHz
• UART speed: 4800bps
• Built-in reference voltage: 1.218V
• Built-in clock: Approximately 4MHz

Features:

• Built-in clock, calibration-free energy metering
• Integrates 2 high-precision Sigma-Delta ADCs, reference voltage, power management
• Measures current, voltage RMS, active power, active energy
• Outputs fast current RMS (for leakage monitoring or overcurrent protection), temperature detection, waveform output
• Patented anti-creeping design
• Current channel features leakage/overcurrent monitoring with configurable thresholds and response times
• Voltage zero-crossing signal output
• Built-in waveform register, capable of outputting waveform data for load type analysis
• Integrated temperature sensor
• Integrated SPI/UART communication methods
• Power-down monitoring; when below 2.7V, the chip enters a reset state
• Built-in 1.218V reference voltage source
• Built-in oscillation circuit, clock approximately 4MHz
• Single 3.3V operating power supply
• Low power consumption

Applications:

• Single-phase multi-function energy meters
• Smart sockets
• Smart home appliances
• Electric bicycle charging piles
• Big data collection for electricity consumption information

Package:

• TSSOP14

The BL0940 is a built-in clock, calibration-free energy metering chip, suitable for single-phase multi-function energy meters, smart sockets, smart home appliances, electric bicycle charging piles, and other applications, offering high cost-effectiveness.

The BL0940 integrates 2 high-precision Sigma-Delta ADCs, reference voltage, power management, and other analog circuit modules, as well as digital signal processing circuits for active power, current and voltage RMS, and other electrical parameters.

The BL0940 can measure parameters such as current, voltage RMS, active power, and active energy. It can output fast current RMS (for leakage monitoring or overcurrent protection), temperature detection, waveform output, and other functions. Data is output via UART/SPI interface, fully meeting the needs of smart sockets, smart home appliances, single-phase multi-function energy meters, electric bicycle charging piles, and big data collection for electricity consumption information.

The BL0940 features a patented anti-creeping design, which, combined with a reasonable external hardware design, ensures that noise power is not counted into energy pulses when there is no current.

(T = 25 °C)