ATM90E26

Part: M90E26

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

Description: Single-phase energy metering IC with 0.1% active energy accuracy over a 5000:1 dynamic range, operating from a 2.8–3.6 V supply with SPI and UART interfaces.

Operating Conditions:

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

Absolute Maximum Ratings:

• Max supply voltage: 3.7 V (Relative Voltage Between AVDD and AGND, DVDD and DGND: -0.3 V to 3.7 V)
• Max junction/storage temperature: 150 °C (Maximum Junction Temperature)

Key Specs:

• Active energy metering accuracy: 0.1% over a 5000:1 dynamic range
• Reactive energy metering accuracy: 0.2% over a 5000:1 dynamic range
• Reference voltage temperature coefficient: 15 ppm/°C (typical)
• Electrical parameters measurement error: < ±0.5% fiducial error for Vrms, Irms, power, frequency, power factor, phase angle
• L line current channel input range (gain = 24): 5 μVrms to 25 mVrms
• Voltage channel input range (gain = 1): 120 μVrms to 600 mVrms
• N line current channel input range (gain = 1): 120 μVrms to 600 mVrms
• Programmable current amplifier gains: 1, 4, 8, 16, 24 (L line); 1, 2, 4 (N line)

Features:

• Compliance with IEC62052-11, IEC62053-21, and IEC62053-23 for Class 1 and Class 2 meters
• Selectable 4-wire SPI, 3-wire SPI, or UART interfaces
• Dedicated ADCs with programmable gains for L line and N line current sampling
• Anti-tampering, fixed L line, and L+N (single-phase three-wire) metering modes
• CF1 and CF2 outputs for active and reactive energy pulses
• Programmable voltage sag detection and zero-crossing output
• Single-point calibration for active energy; no calibration required for reactive energy

Applications:

• Single-phase two-wire (1P2W) active and reactive energy meters
• Single-phase three-wire (1P3W) energy meters
• Anti-tampering energy meters
• Power instruments requiring voltage and current measurement

Package:

• Green SSOP28

• 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)