Atmel M90E26 Single-Phase High-Performance Wide-Span Energy Metering IC DATASHEET FEATURES Metering Features Metering features fully in compliance with the requirements of IEC62052-11, IEC62053-21 and IEC62053-23 applicable in class 1 or class 2 single-phase watt- hour meter or class 2 single-phase var-hour meter. Accuracy of 0.1% for active energy and 0.2% for reactive 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 no cali- bration needed for reactive 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/ reactive/ apparent power, frequency, power factor and phase angle. Forward/ reverse active/ reactive energy with independent energy registers. Active/ reactive energy can be output by pulse or read through energy registers to adapt to different applications. 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. Selectable UART interface and SPI interface (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 and CF2 output active and reactive energy pulses respectively which can be used for calibration or energy accumulation. Crystal oscillator frequency: 8.192 MHz. Atmel-46002B-SE-M90E26-Datasheet 110714 Green SSOP28 package. Operating temperature: -40 ~ +85 . APPLICATION The M90E26 is used for active and reactive energy metering for single-phase two-wire (1P2W), single-phase three-wire (1P3W) or anti-tampering energy meters. With the measurement function, the M90E26 can also be used in power instru- ments which need to measure voltage, current, etc. DESCRIPTION The M90E26 is a high-performance wide-span energy metering chip. The ADC and DSP technology ensure the chip s long- term stability over variations in grid and ambient environmental conditions. BLOCK DIAGRAM MMD1 MMD0 DSP Module I1P L Line Forward/Reverse Active/ PGA X1/X4/X8/ Reactive Power ADC HPF1 HPF0 X16/X24 L Line Apparent Power I1N L Line Irms VP ADC HPF1 HPF0 Vrms VN N Line Forward/Reverse Active/ I2P Reactive Power HPF1 HPF0 ADC NGain N Line Apparent Power I2N N Line Irms Vref Reference Voltage Active Reactive Power Factor/ Energy Pulse Energy Pulse WarnOut/IRQ/ZX Crystal Oscillator SPI / UART Angle/Frequency Output Output Power On Reset RESET SDO/ SDI/ CF1 CF2 WarnOut IRQ ZX OSCO OSCI CS SCLK UTX URX Figure-1 M90E26 Block Diagram M90E26 DATASHEET 2 Atmel-46002B-SE-M90E26-Datasheet 110714