Cirrus Logic CS5460A-BSZ

The CS5460A is a highly integrated power measurement solution which combines two ∆Σ 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 micro-controller 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.

• 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+ = +5ΔV; VA- = 0 V; VD+ = +3.3 V to +5 V