Atmel M90E25 Single-Phase High-Performance Wide-Span Energy Metering IC PRELIMINARY DATASHEET FEATURES Metering Features Metering features fully in compliance with the requirements of IEC62052-11 and IEC62053-21 applicable in class 1 or class 2 single-phase watt-hour meter. Accuracy of 0.1% for active energy over a dynamic range of 5000:1. Temperature coefficient is 15 ppm/ (typical) for on-chip reference voltage Single-point calibration over a dynamic range of 5000:1 for active energy. Energy Meter Constant doubling at low current to save verification time. Electrical parameters measurement: less than 0.5% fiducial error for Vrms, Irms, mean active/ apparent power, frequency, power factor and phase angle. Forward/ reverse active energy with independent energy registers. Active energy can be output by pulse or read through energy registers to adapt to different appli- cations. Programmable startup and no-load power threshold. Dedicated ADC and different gains for L line and N line current sampling circuits. Current sampled over shunt resistor or current transformer (CT) voltage sampled over resistor divider network or potential transformer (PT). Programmable L line and N line metering modes: anti-tampering mode (larger power), L line mode (fixed L line), L+N mode (applicable for single-phase three-wire system) and flexible mode (configure through register). Programmable L line and N line power difference threshold in anti-tampering mode. Other Features 3.3V single power supply. Operating voltage range: 2.8~3.6V. Metering accuracy guaranteed within 3.0V~3.6V. 5V compatible for digital input. Built-in hysteresis for power-on reset. Four-wire SPI interface or simplified three-wire SPI interface with fixed 24 cycles for all registers operation Parameter diagnosis function and programmable interrupt output of the IRQ inter- rupt signal and the WarnOut signal. Programmable voltage sag detection and zero-crossing output. Channel input range - Voltage channel (when gain is 1 ): 120Vrms~600mVrms. - L line current channel (when gain is 24 ): 5Vrms~25mVrms. - N line current channel (when gain is 1 ): 120Vrms~600mVrms. Programmable L line current gain: 1, 4, 8, 16, 24 Programmable N line gain: 1, 2, 4. Support L line and N line offset compensation. CF1 outputs active energy pulses which can be used for calibration or energy accu- mulation. Crystal oscillator frequency: 8.192 MHz. On-chip 10pF capacitors and no need of external capacitors. Green SSOP28 package. Operating temperature: -40 ~ +85 . Atmel-46001A-SE-M90E25-Datasheet 041814APPLICATION The M90E25 is used for active energy metering for single-phase two-wire (1P2W), single-phase three-wire (1P3W) or anti-tampering energy meters. With the measurement function, the M90E25 can also be used in power instru- ments which need to measure voltage, current, etc. DESCRIPTION The M90E25 is high-performance wide-span energy metering chips. The ADC and DSP technology ensure the chips long-term stability over variations in grid and ambient environmental conditions. BLOCK DIAGRAM MMD1 MMD0 DSP Module I1P PGA X1/X4/X8/ ADC X16/X24 L Line Forward/Reverse Active Power I1N HPF1 HPF0 L Line Apparent Power L Line Irms VP PGA ADC X1 VN HPF1 HPF0 Vrms N Line Forward/Reverse Active Power I2P PGA HPF1 HPF0 N Line Apparent Power ADC X1/X2/X4 I2N N Line Irms Vref Reference Voltage Active Energy Power Factor/ WarnOut/IRQ/ZX Crystal Oscillator 3-wire or 4-wire SPI Pulse Output Angle/Frequency Power On Reset RESET WarnOut IRQ CF1 ZX OSCI OSCO CS SCLK SDO SDI Figure-1 Block Diagram M90E25 PRELIMINARY DATASHEET 2 Atmel-46001A-SE-M90E25-Datasheet 041814