The manual describes the features, pin definitions, system functions, calibration methods, SPI interface and electrical specifications of the ATT7026A…
The ATT7026A is a high‑precision three‑phase active and reactive energy measurement chip designed for three‑wire and four‑wire power‑meter applications. It integrates six sigma‑delta ADC channels, on‑chip DSP processing and provides active, reactive, apparent power, power factor, phase angle and frequency measurements.
The document covers chip characteristics, pin assignments, system functions such as power‑monitoring and reset, hardware and software calibration procedures, the SPI communication protocol, and detailed electrical parameters and package information. This manual is written in Chinese.
| Supply voltage VCC | 4.75 V – 5.25 V (typical 5 V) |
|---|---|
| Core supply voltage VDD | 3.0 V |
| Reference voltage | 2.3 V – 2.6 V (typical 2.4 V) |
| ADC resolution | 16 bit |
| ADC sampling rate | 3.2 kHz |
| ADC dynamic range | 88 dB |
| Logic high input voltage (V_IH) | ≥ 2.5 V |
| Logic low input voltage (V_IL) | ≤ 0.8 V |
| Package | 44‑pin QFP (10 mm × 10 mm) |
The chip provides an SPI interface for transferring measurement data and calibration parameters between the ATT7026A and an external MCU.
Calibration can be performed either with a hardware resistor‑network method or a software method that uses calibration registers to adjust gain and phase.
The device integrates six sigma‑delta ADC channels, each with a 16‑bit resolution.