CS5460A Single-Phase Power and Energy Measurement Module – CJMCU, Shunt Interface

The CS5460A-MODULE is a compact breakout board built around the Cirrus Logic CS5460A, a highly integrated single-phase bi-directional power and energy measurement IC. The device combines two ΔΣ analog-to-digital converters (ADCs), a high-speed power calculation engine, and a serial interface on a single chip, enabling precise measurement of active (real) energy, instantaneous power, IRMS, and VRMS for single-phase 2-wire or 3-wire metering applications.

The CS5460A interfaces to a low-cost shunt resistor or current transformer for current sensing, and to a resistive divider or potential transformer for voltage sensing. This flexibility makes the module suitable for both AC and DC system calibration. The on-chip 2.5V reference (with a typical drift of 25 ppm/°C) ensures stable measurements, while the energy-to-pulse conversion output provides a frequency proportional to active energy, allowing direct interfacing with mechanical counters or stepper motors.

A standout feature is the "Auto-boot" mode, which enables the CS5460A to operate standalone without a microcontroller by reading calibration data and startup instructions from an external EEPROM. This lowers the total bill-of-materials cost for high-volume residential energy metering. The device also includes a watchdog timer, a power supply monitor, and a simple three-wire digital serial interface for communication with a host MCU when needed. With power consumption below 12mW and linearity of ±0.1% over a 1000:1 dynamic range, the module meets the accuracy specifications of IEC 687/1036 and JIS standards, making it a practical choice for wireless power metering, radar pulse measurements, and general-purpose energy monitoring.