1.Function Introduction

BL0940 is a built-in clock and calibration-free energy metering IC, suitable for single-phase multifunctional electricity meter, smart socket, smart home appliances, electric bicycle charging pile and other applications with better cost performance.

BL0940 integrates 2 high-precision sigma-delta ADCs to measure current and voltage simultaneously. It can measure electric parameters such as current and voltage RMS, active power, active energy, fast current RMS (for over-current protection), and temperature detection, waveform output and so on.

BL0940 output data through the UART or SPI interface. It is available for the smart socket, smart appliances, single-phase multi-function power meter, electric bicycle charging pile and information requirement of data acquisition in electricity applications.

BL0940 has a patented anti-creep design, which can be combined with reasonable external hardware design to ensure that the noise energy cannot be calculated in the energy pulse when there is no load

2.Features

n 2 high-precision sigma-delta ADCs for current and voltage measuring

n The range of current（10mA~35A）@1mohm

n The range of Active energy（1w~7700w）@1mohm@220V

n Measure RMS Voltage and Current, fast current RMS, Active Power, Active Energy

n The gain error is less than 1%, calibration-free when peripheral components meet certain conditions.

n the current channel support over-current monitoring function, the threshold and response time can be configured.

n Voltage zero-Crossing logic output

n Built-in waveform register for load type analysis

n Built-in temperature sensor

n SPI（≤900KHz）/UART（4800bps）

n On-chip power supply monitoring, IC reset when VDD is lower than 2.7V(typical).

n On-chip voltage reference of 1.218V

n On-chip 4MHz oscillator circuit

n Power supply 3.3v, low power consumption 10mW (typical)

n TSSOP14