BL0939 is a calibration-free electric energy metering chip with built-in clock, which is suitable for single-phase multifunctional watt-hour meters, smart plugs, smart home appliances, electric bicycle charging piles and other applications with high cost performance.
BL0939 integrates three channels of high-precision sigma-delta ADC, which can simultaneously measure two channels of current and 1 channel voltage.
BL0939 can measure parameters such as current, effective voltage, active power and active energy, and can output fast effective current (for leakage monitoring or overcurrent protection), as well as temperature detection, waveform output and other functions. Data can be output through UART/SPI interface, which can fully meet the requirements of smart plugs, smart home appliances, single-phase multifunctional watt-hour meters, electric bicycle charging piles and big data collection of electricity consumption information.
BL0939 has patented anti-leakage design, and with reasonable external hardware design, it can ensure that the power pulse does not contain noise power when there is no current.
Main features:
? Three independent sigma-delta adcs are used to measure two currents and one voltage.
? Effective value range of current (10mA~35A)@ 1mohm
? Active energy (1w ~ 7700w) @1mohm @ 220v
? It can output current-voltage rms, fast current rms, active power and current-voltage waveform phase angle.
? The factory gain error of this batch is less than 65438 0%, and the peripheral devices can be calibrated under certain conditions.
? Both current channels have leakage/overcurrent monitoring function, and the monitoring threshold and response time can be set.
? Voltage zero-crossing signal output
? The built-in waveform register can output waveform data for load type analysis.
? The integrated temperature sensor can meet the requirements of over-temperature monitoring of products, preset temperature alarm of large current nodes, environmental temperature measurement and so on.
? Integrated SPI (the fastest rate supports 900KHz)/UART(4800bps) communication mode, UART supports multi-chip communication with address (SSOP20L package).
? Internal power failure monitoring, below 2.7V, the chip will enter the reset state.
? Built-in 1.2 18V voltage reference
? Built-in oscillation circuit, the clock is about 4MHz.
? The single working power supply of the chip is 3.3V, and the power consumption is low 10mW (typical).
? SSOP20L/SOP 16L package
BL0939 is mainly divided into two parts: analog signal processing and digital signal processing. The analog part mainly includes three-channel PGA, three-channel sigma-delta ADC, internal clock, power-on/reset, temperature sensor, LDO and other related analog modules, and the digital part is digital signal processing module (DSP).
BL0939 has the anti-submarine function of power supply, which ensures that the board-level noise power supply will not accumulate electricity without current input.