MAX71020 Single-Chip Electricity Meter AFE General Description Features S 0.1% Accuracy Over 2000:1 Current Range The MAX71020 is a single-chip analog front-end (AFE) for use in high-performance revenue meters. It contains S Exceeds IEC 62053/ANSI C12.20 Standards the compute engine (CE) found in Maxim Integrateds S Two Differential Current Sensor Inputs fourth-generation meter system-on-chip (SoC) and an S Two Voltage Sensor Inputs improved analog-to-digital converter (ADC), and inter- S Selectable Gain of 1 or 8.9 for One Current Input faces to the host controller of choice over a SPI interface. to Support a Shunt The MAX71020 comes in a 28-pin TSSOP package. 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 Ordering Information appears at end of data sheet. S 45Hz to 65Hz Line Frequency Range with Same Calibration For related parts and recommended products to use with this part, S Phase Compensation (10) refer to www.maximintegrated.com/MAX71020.related. S Four Multifunction DIO Pins S SPI Interface S -40C to +85C Industrial Temperature Range S 28-Pin TSSOP Lead(Pb)-Free Package Typical Operating Circuit NEUTRAL CT LOAD NOTE: THIS SYSTEM IS REFERENCED TO LINE VOLTAGE SHUNT LINE NEUTRAL POWER SUPPLY LINE RESISTOR- MUX AND ADC V V GNDA GNDD 3P3A 3P3SYS DIVIDER IAP LINE IAN MAX71020 VA REGULATOR VB IBP TEMPERATURE SENSOR IBN V REF COMPUTE ENGINE POWER-FAULT COMPARATOR DIO, PULSES OSCILLATOR/PLL XIN HOST SPI 9.8304MHz INTERFACE XOUT For pricing, delivery, and ordering information, please contact Maxim Direct at 19-6400 Rev 1 1/13 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.MAX71020 Single-Chip Electricity Meter AFE ABSOLUTE MAXIMUM RATINGS Digital Pins (All voltages with respect to GNDA.) Inputs .................................... (-10mA to +10mA), (-0.5V to +6V) Voltage and Current Supplies and Ground Pins Outputs ............ (-10mA to +10mA), (-0.5V to (V + 0.5V)) V , V ..................................................-0.5V to +4.6V 3P3SYS 3P3SYS 3P3A Temperature and ESD Stress GNDD ...................................................................-0.1V to +0.1V Operating Junction Temperature (peak, 100ms) ..............140C Analog Input Pins Operating Junction Temperature (continuous) .................125C IAP, IAN, IBP, IBN, VA, VB ............................(-10mA to +10mA), Storage Temperature Range ............................ -45C to +165C (-0.5V to +0.5V) ESD Stress on All Pins ..............................................4kV, HBM XIN, XOUT ......................... (-10mA to +10mA), (-0.5V to +3.0V) Lead Temperature (soldering, 10s) ..................................300C Soldering Temperature (reflow) ......................................+250C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. PACKAGE THERMAL CHARACTERISTICS (Note 1) TSSOP Junction-to-Ambient Thermal Resistance (q ) ..........78C/W JA Junction-to-Case Thermal Resistance (q ) ...............13NC/W JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS RECOMMENDED OPERATING CONDITIONS Precision metering operation 3.0 3.6 V and V Supply 3P3SYS 3P3A V Voltage Digital operation (Notes 2, 3) 2.8 3.6 Operating Temperature -40 +85 C INPUT LOGIC LEVELS Digital High-Level Input Voltage 2 V (V ) IH Digital Low-Level Input Voltage 0.8 V (V ) IL Input Pullup Current (I ) IL V = 3.6V, V = 0V 41 78 115 A V3P3SYS IN RESETZ Input Pullup Current (I ) Other IL V = 3.6V, V = 0V -1 0 +1 A V3P3SYS IN Digital Inputs Input Pulldown Current (I ) All IH V = V -1 0 +1 A IN V3P3SYS Pins OUTPUT LOGIC LEVELS V V3P3SYS I = 1mA LOAD - 0.4 Digital High-Level Output V Voltage (V ) OH V V3P3SYS I = 15mA (Note 3) LOAD - 1.1 I = 1mA 0 0.4 Digital Low-Level Output LOAD V Voltage (V ) I = 15mA (Note 3) 0 0.96 OL LOAD Maxim Integrated 2