chip

ATT7022E/26E/28E series multifunctional high-precision three-phase electric energy dedicated metering chip, suitable for three-phase three wire and three-phase four wire applications.

ATT7022E/26E/28E integrates multiple second-order sigma delta ADCs, reference voltage circuits, and digital signal processing circuits for all power, energy, RMS, power factor, and frequency measurements. It can measure active power, reactive power, apparent power, active energy, and reactive energy of each phase and phase combination, as well as parameters such as current, RMS, power factor, phase angle, and frequency of each phase, fully meeting the needs of three-phase multi rate multifunctional energy meters. Please refer to the parameter register section for detailed data definitions.

ATT7022E/26E/28E supports full digital domain gain and phase correction, i.e. pure software calibration. Active and reactive power pulse outputs CF1 and CF2 provide instantaneous active and reactive power information, which can be directly connected to a standard meter for error correction. For detailed calibration methods, please refer to the calibration methods section.

ATT7022E/26E provides two types of apparent power and energy measurement methods: RMS apparent mode and PQS apparent mode. It outputs apparent energy pulses through CF3 and can be connected to a standard meter for apparent energy error correction.

ATT7022E provides fundamental parameter measurement: fundamental active power, fundamental active energy, fundamental current, and effective voltage. It provides instantaneous fundamental active power information through pulse output CF4, which can be directly used for fundamental correction.

ATT7022E/26E/28E provides an SPI interface to facilitate the transfer of measurement and calibration parameters between external MCUs. The specific specifications of the SPI interface can be found in the SPI detailed description section, and all measurement and calibration parameters can be read out through the SPI interface.

The built-in voltage monitoring circuit of ATT7022E/26E/28E can ensure normal operation during power on and off.

Chip characteristics

High precision, non-linear measurement error less than 0.1% within the input dynamic working range (5000:1)

Active measurement meets 0.2S and 0.5S requirements, supports IEC62053-22:2003, GB/T17215.322-2008

Reactive power measurement meets levels 1 and 2, supports IEC62053-23:2003, GB/T17215.323-2008

Provide fundamental active power/electrical energy/voltage/current effective values and CF pulse output

Provide RMS and PQS as two types of apparent power and energy metering (optional)

Provide active, reactive, apparent power/electrical energy, and CF pulse output

Provide parameters such as power factor, phase angle, line frequency, and voltage angle

Provide effective voltage and current values, with a dynamic range of 500:1 and an effective value accuracy better than 0.1%

Provide effective value output of three-phase voltage vector sum and current vector sum

Provide phase failure indication and voltage/current phase sequence detection function

Interrupt support: zero crossing interrupt, sampling interrupt, power pulse interrupt, meter calibration interrupt

Provide reverse indication function for active and reactive power

The absolute value addition and algebraic addition of combined energy are optional

Adjustable electric meter constant

Adjustable starting current

Accurate measurement of active, reactive, apparent power, and electrical energy containing the 41st harmonic

Support gain and phase compensation, small current nonlinear compensation

Equipped with SPI communication interface, the speed can reach 10Mbps

Built in temperature measurement sensor

Suitable for three-phase three wire and three-phase four wire modes

Internal reference voltage or external reference voltage can be used



Provide SAG function for power quality detection and can be used for flicker analysis (ATT7022E)

Provide synchronous sampling data for harmonic analysis without the need for preprocessing (ATT7022E).

Provide 1k * 16 bit ADC data cache buffer

Provide pulse doubling function for easy calibration of small signals

Supports ROSI coils

Adopting LQFP44 packaging

3.3V power supply

Crystal 5.5296MHz