Datasheet ATM90E26 (Microchip) - 2

• 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 PGA L Line Forward/Reverse Active/ 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 ADC NGain HPF1 HPF0 N Line Apparent Power I2N N Line Irms Vref Reference Voltage Active Reactive Power Factor/ Crystal Oscillator SPI / UART Energy Pulse Energy Pulse WarnOut/IRQ/ZX Output Output Angle/Frequency RESET Power On Reset SDO/ SDI/ OSCI OSCO CS SCLK CF1 CF2 WarnOut IRQ ZX UTX URX
Figure-1 M90E26 Block Diagram
M90E26 [DATASHEET] 2 Atmel-46002B-SE-M90E26-Datasheet_110714 Document Outline Features Application Description Block Diagram 1 Pin Assignment 2 Pin Description 3 Functional Description 3.1 Dynamic Metering Range 3.2 Startup and No-Load Power 3.3 Energy Registers 3.4 N Line Metering and Anti-Tampering 3.4.1 Metering Mode and L/N Line Current Sampling Gain Configuration 3.4.2 Anti-Tampering Mode Threshold Compare Method Special Treatment at Low Power 3.5 Measurement and Zero-Crossing 3.5.1 Measurement 3.5.2 Zero-Crossing 3.6 Calibration 3.7 Reset 4 Interface 4.1 SPI Interface 4.1.1 Four-Wire Mode Read Sequence Write Sequence 4.1.2 Three-Wire Mode 4.1.3 Timeout and Protection 4.2 UART Interface 4.2.1 Byte Level Timing 4.2.2 Write Transaction 4.2.3 Read transaction 4.2.4 Checksum 4.3 WarnOut Pin for Fatal Error Warning 4.4 Low Cost Implementation in Isolation with MCU 5 Register 5.1 Register List 5.2 Status and Special Register SoftReset Software Reset SysStatus System Status FuncEn Function Enable SagTh Voltage Sag Threshold SmallPMod Small-Power Mode LastData Last Read/Write SPI/UART Value 5.3 Metering/ Measurement Calibration and Configuration 5.3.1 Metering Calibration and Configuration Register LSB RMS/Power 16-bit LSB CalStart Calibration Start Command PLconstH High Word of PL_Constant PLconstL Low Word of PL_Constant Lgain L Line Calibration Gain Lphi L Line Calibration Angle Ngain N Line Calibration Gain Nphi N Line Calibration Angle PStartTh Active Startup Power Threshold PNolTh Active No-Load Power Threshold QStartTh Reactive Startup Power Threshold QNolTh Reactive No-Load Power Threshold MMode Metering Mode Configuration CS1 Checksum 1 5.3.2 Measurement Calibration Register AdjStart Measurement Calibration Start Command Ugain Voltage rms Gain IgainL L Line Current rms Gain IgainN N Line Current rms Gain Uoffset Voltage Offset IoffsetL L Line Current Offset IoffsetN N Line Current Offset PoffsetL L Line Active Power Offset QoffsetL L Line Reactive Power Offset PoffsetN N Line Active Power Offset QoffsetN N Line Reactive Power Offset CS2 Checksum 2 5.4 Energy Register Theory of Energy Registers APenergy Forward Active Energy ANenergy Reverse Active Energy ATenergy Absolute Active Energy RPenergy Forward (Inductive) Reactive Energy RNenergy Reverse (Capacitive) Reactive Energy RTenergy Absolute Reactive Energy EnStatus Metering Status 5.5 Measurement Register Irms L Line Current rms Urms Voltage rms Pmean L Line Mean Active Power Qmean L Line Mean Reactive Power Freq Voltage Frequency PowerF L Line Power Factor Pangle Phase Angle between Voltage and L Line Current Smean L Line Mean Apparent Power Irms2 N Line Current rms Pmean2 N Line Mean Active Power Qmean2 N Line Mean Reactive Power PowerF2 N Line Power Factor Pangle2 Phase Angle between Voltage and N Line Current Smean2 N Line Mean Apparent Power 6 Electrical Specification 6.1 Electrical Specification 6.2 SPI Interface Timing 6.3 Power On Reset Timing 6.4 Zero-Crossing Timing 6.5 Voltage Sag Timing 6.6 Pulse Output 6.7 Absolute Maximum Rating Ordering Information Packaging Drawings Revision History