MAX71020

19-6400; Rev 0; 7/12 MAX71020 Single-Chip Electricity Meter AFE General Description The MAX71020 is a single-chip, analog front-end to be used in high-performance revenue meters. It contains the compute engine found in Maxim’s fourth-generation meter SOC and an improved ADC, and interfaces to the host microcontroller of choice over a SPI interface. The MAX71020 comes in a 28-pin TSSOP package. Features S 0.1% Accuracy Over 2000:1 Current Range S Exceeds IEC 62053/ANSI C12.20 Standards S Two Differential Current Sensor Inputs S Two Voltage Sensor Inputs S Selectable Gain of 1 or 9 for One Current Input to Support a Shunt S High-Speed Wh/VARh Pulse Outputs with Programmable Width S Up to Four Pulse Outputs with Pulse Count S Four-Quadrant Metering S Digital Temperature Compensation S Independent 32-Bit Compute Engine S 45Hz to 65Hz Line Frequency Range with Same Calibration S Phase Compensation (±10°) S Four Multifunction DIO Pins S SPI Interface S -40°C to +85°C Industrial Temperature Range S 28-Pin TSSOP Lead(Pb)-Free Package Ordering Information appears at end of data sheet. For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX71020.related. www.DataSheet.net/ Typical Operating Circuit NEUTRAL CT LOAD LINE SHUNT NOTE: THIS SYSTEM IS REFERENCED TO LINE NEUTRAL LINE RESISTORDIVIDER POWER SUPPLY LINE MUX AND ADC IAP IAN VA VB IBP IBN VREF V3P3A V3P3SYS GNDA GNDD MAX71020 REGULATOR TEMPERATURE SENSOR CO...