ATM90E26-YU-R

Part: M90E26

Type: Single-Phase High-Performance Wide-Span Energy Metering IC

Description: The M90E26 is a high-performance wide-span energy metering chip with 0.1% accuracy for active energy and 0.2% for reactive energy over a 5000:1 dynamic range, supporting single-phase two-wire or three-wire systems.

Operating Conditions:

• Supply voltage: 2.8–3.6V (3.0V–3.6V for guaranteed metering accuracy)
• Operating temperature: -40 to +85 °C
• Crystal oscillator frequency: 8.192 MHz

Absolute Maximum Ratings:

Key Specs:

• Active energy accuracy: 0.1% over 5000:1 dynamic range
• Reactive energy accuracy: 0.2% over 5000:1 dynamic range
• Temperature coefficient (on-chip reference voltage): 15 ppm/°C (typical)
• Electrical parameters measurement error: less than ± 0.5% fiducial error for Vrms, Irms, power, frequency, power factor, phase angle
• L line current channel input range (gain '24'): 5 μVrms–25mVrms
• Voltage channel input range (gain '1'): 120 μVrms–600mVrms
• N line current channel input range (gain '1'): 120 μVrms–600mVrms
• Digital input compatibility: 5V

Features:

• Compliance with IEC62052-11, IEC62053-21, IEC62053-23 for class 1/2 watthour or class 2 var-hour meters
• Single-point calibration for active energy; no calibration for reactive energy
• Energy Meter Constant doubling at low current
• Forward/reverse active/reactive energy with independent registers
• Programmable startup and no-load power threshold
• Dedicated ADC and different gains for L line and N line current sampling
• Current sampled over shunt resistor or CT; voltage sampled over resistor divider or PT
• Programmable L line and N line metering modes: anti-tampering, L line, L+N, flexible
• 3.3V single power supply with built-in hysteresis for power-on reset
• Selectable UART and SPI interface (four-wire or simplified three-wire)
• Parameter diagnosis function and programmable interrupt output (IRQ, WarnOut)
• Programmable voltage sag detection and zero-crossing output
• Programmable L line current gain: 1, 4, 8, 16, 24; N line gain: 1, 2, 4
• Support L line and N line offset compensation
• CF1 and CF2 output active and reactive energy pulses

Applications:

• Active and reactive energy metering for single-phase two-wire (1P2W)
• Active and reactive energy metering for single-phase three-wire (1P3W)
• Anti-tampering energy meters
• Power instruments measuring voltage, current, etc.

Package:

• Green SSOP28 package

• 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 watthour 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/ °C (typical) for on-chip reference voltage
• Single-point calibration over a dynamic range of 5000:1 for active energy; no calibration 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.

Figure-2 Pin Assignment (Top View)

Figure-2 Pin Assignment (Top View)