MAX71020 Datasheet, PDF (1/37 Pages) Maxim Integrated Products – Single-Chip Electricity Meter AFE

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.
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.
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
Typical Operating Circuit
NEUTRAL
CT
LINE
SHUNT
RESISTOR-
DIVIDER
LINE
HOST
LOAD
NOTE: THIS SYSTEM IS REFERENCED TO LINE
NEUTRAL
LINE
POWER SUPPLY
MUX AND ADC
IAP
IAN
VA
VB
IBP
IBN
VREF
POWER-FAULT
COMPARATOR
DIO, PULSES
SPI
INTERFACE
V3P3A V3P3SYS GNDA GNDD
MAX71020
REGULATOR
TEMPERATURE SENSOR
COMPUTE ENGINE
OSCILLATOR/PLL
XIN
XOUT
9.8304MHz
For pricing, delivery, and ordering information, please contact Maxim Direct
  1
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.