CS5461A

Single Phase Power/Energy IC

Overview

Channels	Instantaneous I & V	Energy Pulse Outputs	SPI Interface	Real (Active) Power	IRMS, VRMS	Apparent Power (S)	Reactive Power (Q)	Fundamental Power	Temp Sensor	Package
2							—	—		24 SSOP
Note:
All Energy Measurement parts have Data Linearity of 0.1% over a 1000:1 Range.

Description

The CS5461A enables digital power meter manufacturers to provide highly accurate, cost-effective solutions for measuring power usage. This IC is an integrated power-measurement device that combines two Delta-Sigma A/D converters, high-speed power calculation functions and a serial interface on a single chip. Additional features include AC and DC calibration and phase compensation. Designed for residential single-phase or industrial three phase power-meter applications, the IC accurately measures instantaneous current and voltage while calculating instantaneous power, real power, apparent power, I_RMS and V_RMS.

The CS5461A is easy to design in as a pin-compatible upgrade to the popular Cirrus Logic CS5460A. It retains all the functionality of its predecessor, while also providing an on-chip temperature sensor which can be used to lower the temperature coefficient, allowing for higher accuracy over temperature. For communication with a microcontroller, the IC features a bi-directional serial interface, which is initialized and fully functional upon reset. The CS5461A can interface to a low-cost shunt resistor or transformer for current measurement and to a resistive divider or potential transformer for voltage measurement. The CS5461A delivers accurate power usage measurements and is ideal for electronic power meter applications.

Features

• Energy data linearity: +0.1% of reading over 1000:1 dynamic range
• On-chip Functions:
• Instantaneous Voltage, Current and Power
• I_RMS and V_RMS, Average Real and Apparent Power
• Energy-to-pulse conversion
• Meets accuracy spec for IEC, ANSI, JIS
• Low-power consumption
• Adjustable input range on current channel
• GND-referenced signals with single supply
• On-chip temperature sensor
• On-chip 2.5 V reference (typ 25 ppm/°C)
• AC/DC system calibrations
• Phase compensation
• Simple 3-wire digital serial interface
• Power-supply monitor
• Programmable energy-to-pulse output function
• Configurable pulse outputs for stepper motor or mechanical counter
• Power supply configurations:
• VA+ = +5 V; AGND = 0 V;
• VD+ = +3.3 V to +5 V
• Package: 24-pin SSOP; lead-free assembly

Diagram

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