Single-Phase High-Performance Wide-Span Energy Metering IC 90E21/22/23/24
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Single-Phase High-Performance Wide-Span Energy Metering IC 90E21/22/23/24

1600 Technology Drive, San Jose, CA 95110 USA © 2013 Atmel Corporation. All rights reserved. / Rev.: Atmel-Meter-ATM90E21-22-23-24-Datasheet-Eng_042013 Atmel®, Atmel logo and combinations thereof, Enabling Unlimited Possibilities®, and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others. DISCLAIMER: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document...

Single-Phase High-Performance Wide-Span Energy Metering IC FEATURES Other Features Metering 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 interrupt signal and the WarnOut signal. • Programmable voltage sag detection and zero-crossing output. • Channel input...

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC L Line Forward/Reverse Active Power L Line Apparent Power L Line Irms Reference Voltage Crystal Oscillator Active Energy Pulse Output Power Factor/ Angle/Frequency L Line Forward/Reverse Active/ Reactive Power L Line Apparent Power L Line Irms Reference Voltage Crystal Oscillator Active Reactive Energy Pulse Energy Pulse Output Output Power Factor/ Angle/Frequency Block Diagram

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC L Line Forward/Reverse Active Power L Line Apparent Power L Line Irms N Line Forward/Reverse Active Power N Line Apparent Power N Line Irms Reference Voltage Crystal Oscillator Active Energy Pulse Output Power Factor/ Angle/Frequency L Line Forward/Reverse Active/ Reactive Power L Line Apparent Power L Line Irms N Line Forward/Reverse Active/ Reactive Power N Line Apparent Power N Line Irms Reference Voltage Crystal Oscillator Active Reactive Energy Pulse Energy Pulse Output Output Power Factor/ Angle/Frequency Block Diagram

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC Figure-5 Pin Assignment (Top View) Note 1: Pin 1 and 28 are dedicated for the 90E23/24. Pin 1 should connect to DGND and pin 28 should connect to DVDD for 90E21/22. Note 2: Pin 7 and 8 are dedicated for the 90E23/24. They should be left open for the 90E21/22. Note 3: Pin 19 is dedicated for the 90E22/24. It should be left open for the 90E21/23.

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC Reset: Reset Pin (active low) This pin should connect to ground through a 0.1μF filter capacitor. In application it can also directly connect to one output pin from microcontroller (MCU). DVDD: Digital Power Supply This pin provides power supply to the digital part. It should be decoupled with a 10μF electrolytic capacitor and a 0.1μF capacitor. DGND: Digital Ground AVDD: Analog Power Supply This pin provides power supply to the analog part. This pin should connect to DVDD through a 10Ω resistor and be decoupled with a 0.1μF...

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC Table-2 Pin Description (Continued) note 1 Description OSCI: External Crystal Input An 8.192 MHz crystal is connected between OSCI and OSCO. There is an on-chip 10pF capacitor, therefore no need of external capacitors. OSCO: External Crystal Output An 8.192 MHz crystal is connected between OSCI and OSCO. There is an on-chip 10pF capacitor, therefore no need of external capacitors. CF1: Active Energy Pulse Output CF2: Reactive Energy Pulse Output These pins output active/reactive energy pulses. Note: CF2 is dedicated for the...

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC FUNCTIONAL DESCRIPTION DYNAMIC METERING RANGE Table-5 Threshold Configuration for Startup and No-Load Power Threshold Threshold for Active Startup Power Threshold for Active No-load Power Threshold for Reactive Startup Power Threshold for Reactive No-load Power Accuracy is 0.1% for active energy metering and 0.2% for reactive energy metering over a dynamic range of 5000:1 (typical). Refer to Table-3 and Table-4. Table-3 Active Energy Metering Error Current Power Factor The chip has no-load status bits, the Pnoload/Qnoload bit...

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC N LINE METERING AND ANTI-TAMPERING METERING MODE AND L/N LINE CURRENT SAMPLING GAIN CONFIGURATION 1.5625%, altogether 16 choices. The configuration is made by the Pthresh[3:0] bits (MMode, 2BH) and the default value is 3.125%. The threshold is applicable for active energy. The metering line of the reactive energy follows that of the active energy. The 90E23 and 90E24 have two current sampling circuits with N line metering and anti-tampering functions. The MMD1 and MMD0 pins are used to configure the metering mode. Refer to Table-7....

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC The above measurements are all calculated with fiducial error except for frequency. The frequency accuracy is 0.01Hz, and the other measurement accuracy is 0.5%. Fiducial error is calculated as follow: The 90E21/22/23/24 has the following measurements: • voltage rms • current rms (L line/N line) • mean active power (L line/N line) • mean reactive power (L line/N line) • voltage frequency • power factor (L line/N line) • phase angle between voltage and current (L line/N line) • mean apparent power (L line/N line) Where Umea is the...

SINGLE-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC Metering Calibration Only single-point calibration is needed over the entire dynamic range. The 90E21/22/23/24 has an on-chip power supply monitor circuit with built-in hysteresis. The 90E21/22/23/24 only works within the voltage range. Metering calibration is realized by first calibrating gain at unity power factor and then calibrating phase angle compensation at 0.5 inductive power factor. The 90E21/22/23/24 has three means of reset: power-on reset, hardware reset and software reset. All registers resume to their default value...