Single Phase, Bi-Directional, Power/Energy SOC

The CS5460A is a highly integrated, Delta-Sigma analog-to-digital converter (ADC) which combines two Delta-Sigma A/D converters, high-speed power calculation functions, and a serial interface on a single chip. It is designed to accurately measure and calculate: 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 resistive divider or potential transformer to measure voltage. The CS5460A features a bi-directional serial interface for communication with a micro-controller and a programmable frequency output that is proportional to energy. CS5460A has on-chip functionality to facilitate AC or DC system-level calibration.

The "Auto-Boot" feature allows the CS5460A to function standalone 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 work without the need for a micro-processor for low-cost metering applications.

• Energy data linearity: ±0.1% of reading over 1000:1 dynamic range
• On-chip functions: energy, I * V, RMS, and VRMS energy-to-pulse conversion
• Smart "Auto-Boot" mode from serial EEPROM
• AC or DC system calibration
• Mechanical counter/stepper motor driver
• Meets accuracy spec for IEC 687/1036, JIS
• Power consumption <12 mW
• Interface optimized for shunt sensor
• Phase compensation
• Ground-referenced signals with single supply
• Simple three-wire digital serial interface
• Watch dog timer
• Power supply monitor
• Power supply configurations
  • VA+ = 5V; VA- = 0V; VD+ = 3 to 5V
  • VA+ = 2.5V; VA- = -2.5V; VD+ = 3V
• On-chip 2.5V reference (MAX 60 ppm/°C drift)
• Package: 24L-pin SSOP