90E21 Datasheet, PDF (6/57 Pages) Integrated Device Technology – Single-Phase High-Performance Wide-Span Energy Metering IC

Single-Phase High-Performance
Wide-Span Energy Metering IC
90E21/22/23/24
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 refer-
ence 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 verifica-
tion time.
• Electrical parameters measurement: less than ±0.5% fiducial
error for Vrms, Irms, mean active/ reactive/ apparent power, fre-
quency, 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 applica-
tions.
• 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 (appli-
cable 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.
DESCRIPTION
The 90E21/22/23/24 series are high-performance wide-span energy
metering chips. IDT's proprietary ADC and DSP technology ensure the
chips' long-term stability over variations in grid and ambient environmen-
tal conditions.
Table-1 Function List
Part
Number
90E21
90E22
90E23
90E24
Active Energy Reactive Energy
Metering
Metering
√
√
√
√
√
√
N Line
Metering
√
√
Electrical
Parameters
Measurement
√
√
√
√
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.
• 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 range
- Voltage channel (when gain is '1'): 120µVrms~600mVrms.
- L line current channel (when gain is '24'): 5µVrms~25mVrms.
- N line current channel (when gain is '1'): 120µVrms~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 respec-
tively which can be used for calibration or energy accumulation.
• Crystal oscillator frequency: 8.192 MHz. On-chip 10pF capaci-
tors and no need of external capacitors.
• Green SSOP28 package.
• Operating temperature: -40 ℃ ~ +85 ℃ .
APPLICATION
• The 90E21/22/23/24 series are used for active and reactive
energy metering for single-phase two-wire, single-phase three-
wire or anti-tampering energy meters. With the measurement
function, the 90E21/22/23/24 series can also be used in power
instruments which need to measure voltage, current, etc.
90E21/22/23/24 are all of green SSOP28 package with the same pin
alignment. In this datasheet, all reactive energy metering parts are only
applicable for the 90E22/24, and all N line metering and measurement
parts are only applicable for the 90E23/24.
IDT and the IDT logo are trademarks of Integrated Device Technology, Inc.
6
 2012 Integrated Device Technology, Inc.
January 10, 2012
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