90E21 datasheet(6/57 Pages) IDT

6 / 57 page

January 10, 2012

90E21/22/23/24

 2012 Integrated Device Technology, Inc.

DSC-7277/6

Single-Phase High-Performance

Wide-Span Energy Metering IC

IDT and the IDT logo are trademarks of Integrated Device Technology, Inc.

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.

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'): 120

µVrms~600mVrms.

- L line current channel (when gain is '24'): 5

µVrms~25mVrms.

- N line current channel (when gain is '1'): 120

µVrms~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.

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.

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.

Table-1 Function List

Part

Number

Active Energy

Metering

ReactiveEnergy

Metering

N Line

Metering

Electrical

Parameters

Measurement

90E21

√√

90E22

√√

√

90E23

√√

√

90E24

√√

√

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