CS5467 Four-channel Power/Energy IC Features & Description Description Energy Linearity: 0.1% of Reading over 1000:1 The CS5467 is a watt-hour meter on a chip. It Dynamic Range measures line voltage and current and calcu- On-chip Functions: lates active, reactive, apparent power, energy, - Voltage and Current Measurement power factor, and RMS voltage and current. - Active, Reactive, and Apparent Power/Energy An internal RMS voltage reference can be used - RMS Voltage and Current Calculations - Current Fault and Voltage Sag Detection if voltage measurement is disabled by - Calibration tampering. - Phase Compensation Four analog-to-digital converters are used to - Temperature Sensor - Energy Pulse Outputs measure two voltages and two currents. Option- ally, voltage2 channel can be used for Meets Accuracy Spec for IEC, ANSI, & JIS temperature measurement. Low Power Consumption Voltage Tamper Correction The CS5467 is designed to interface to a variety Ground-referenced Inputs with Single Supply of voltage and current sensors. On-chip 2.5 V Reference (40 ppm / C typ.) Additional features include system-level calibra- Power Supply Monitor Function tion, voltage sag and current fault detection, Three-wire Serial Interface to Microcontroller or peak detection, phase compensation, and ener- 2 E PROM gy pulse outputs. Power Supply Configurations GND: 0 V, VA+: +5 V, VD+: +3.3 V to +5 V ORDERING INFORMATION See Page 45. VA+ RESET VD+ IIN1+ 4th Order Digital HPF PGA Modulator Filter Option IIN1- MODE CS SDI VIN1+ 2nd Order Digital HPF SDO x10 Serial Modulator Filter Option VIIN1- SCLK Interface Power INT Calculation Engine E1 IIN2+ 4th Order Digital HPF E-to-F E2 PGA Modulator Filter Option IIN2- E3 VIN2+ 2nd Order Digital HPF Calibration x10 VIN2- Modulator Filter Option VREFIN x1 Temperature System Clock Power /K Sensor Clock Generator Monitor Voltage VREFOUT Reference PFMON XIN XOUT CPUCLK DGND AGND JAN 11 Copyright Cirrus Logic, Inc. 2011 CS5467 TABLE OF CONTENTS 1. Overview 5 2. Pin Description . 6 Clock Generator 6 Control Pins and Serial Data I/O 6 Analog Inputs/Outputs 6 Power Supply Connections 6 3. Characteristics & Specifications . 7 Recommended Operating Conditions . 7 Analog Characteristics . 7 Accuracy 7 Analog Inputs (All Inputs) .7 Analog Inputs (Current Inputs) . 7 Analog Inputs (Voltage Inputs) . 8 Temperature . 8 Power Supplies . 8 Voltage Reference 9 Reference Output . 9 Reference Input . 9 Digital Characteristics 10 Master Clock Characteristics . 10 Filter Characteristics 10 Input/Output Characteristics 10 Switching Characteristics 11 Start-up 11 Serial Port Timing 11 SDI Timing . 11 SDO Timing . 11 E2PROM mode Timing 11 E1, E2, and E3 Timing . 13 Absolute Maximum Ratings 13 4. Signal Path Description 14 4.1 Analog-to-Digital Converters 14 4.2 Decimation Filters 14 4.3 Phase Compensation . 14 4.4 DC Offset and Gain Correction 15 4.5 High-pass Filters . 15 4.6 Low-Rate Calculations . 15 4.7 RMS Results 15 4.8 Power and Energy Results . 16 4.9 Peak Voltage and Current 17 4.10 Power Offset . 17 5. Pin Descriptions . 18 5.1 Analog Pins . 18 5.1.1 Voltage1 & Voltage2 Inputs . 18 5.1.2 Current1 & Current2 Inputs 18 5.1.3 Power Fail Monitor Input 18 2 DS714F3