CS5460 Bi-directional Power/Energy IC

The CS5460A is a highly integrated power measurement solution which combines two Analog-to-digital Converters (ADCs), high-speed power calculation functions, and a serial interface on a single chip. It is designed to accurately measure and calculate: Real (True) Energy, Instantaneous Power, IRMS, and VRMS for single phase 2- or 3-wire power metering applications. The CS5460A interfaces to a low-cost shunt resistor or transformer to measure current, and to a resistive divider or potential transformer to measure voltage. The CS5460A features a bi-directional serial interface for communication with a microcontroller and a pulse output engine for which the average pulse frequency is proportional to the real power. The CS5460A has on-chip functionality to facilitate AC or DC system-level calibration.

The “Auto-boot” feature allows the CS5460A to function ‘stand-alone’ and to initialize itself on system power-up. In Auto-boot Mode, the CS5460A reads the calibration data and start-up instructions from an external EEPROM. In this mode, the CS5460A can operate without a microcontroller, in order to lower the total bill-of-materials cost.

Features of CS5460

• Energy Data Linearity: ±0.1% of Reading over 1000:1 Dynamic Range.

• On-Chip Functions: (Real) Energy, I * V, IRMS and VRMS, Energy-to-Pulse Conversion

• Smart “Auto-boot” Mode from Serial EEPROM Enables Use without MCU.

• AC or DC System Calibration

• Mechanical Counter/Stepper Motor Driver

• Meets Accuracy Spec for IEC 687/1036, JIS

• Typical Power Consumption <12 mW

• Interface Optimized for Shunt Sensor

• V vs. I Phase Compensation

• Ground-Referenced Signals with Single Supply

• On-chip 2.5 V Reference (MAX 60 ppm/°C drift)

• Simple Three-wire Digital Serial Interface

• Watch Dog Timer

• Power Supply Monitor

• Power Supply Configurations VA+ = +5 V; VA- = 0 V; VD+ = +3.3 V to +5 V