19-5361 Rev 7/11 71M6515H A Maxim Integrated Products Brand Energy Meter IC DATA SHEET JULY 2011 GENERAL DESCRIPTION FEATURES The 71M6515H is a high-accuracy analog front-end High Accuracy (AFE) IC that provides measurements for 3-quadrant < 0.1% Wh accuracy over 2000:1 range 3-phase metering. The combination of a 21-bit Exceeds IEC 62053/ANSIC 12.20 specifications sigma-delta A/D converter with a six-input analog Up to 10ppm/ C precision ultra-stable voltage front-end, a thermally compensated high-precision reference reference, and a compute engine results in high Single Converter Technology reduces cross talk accuracy and wide dynamic range. Our Single and power consumption Converter Technology reduces cross talk and cost. Six sensor inputsreferenced to V3P3 This IC also provides RTC and battery backup for Compatible with CTs, resistive shunts and time-of-use (TOU) metering. Rogowski Coil sensors Digital temperature compensation Sag detection Measures Wh, VARh, VAh, Vrms, Irms, V-to-V phase and load angle on each phase Battery Four-quadrant metering. Four low-jitter pulse outputs from selectable measurements Four pulse count registers UART, IRQZ RTC Selectable default status for pulse pins HOST RAM COMPUTE PRO- Same calibration data for 46Hz to 64Hz line ENGINE CESSOR frequency SSI Broad CT phase compensation (7deg) VOLTAGE CONTROL REFERENCE Battery Backup Powers real-time clock during power supply DIO outage TERIDIAN 71M6515H Compatible with Li-ion, NiCd, or super capacitor Battery backup current 2A typical at 25C Figure 1: Meter Block Diagram External Data Interface UART control interface, two selectable data rates As shown in the block diagram (Figure 1), the host 8 general-purpose I/O pins with alarm capability processor communicates with the 71M6515H 5 or 10MHz selectable high-speed synchronous through a UART interface using the programmable serial output for DSP interface IRQZ interrupt. The 71M6515H calculates and accu- IRQ output signal for alarms and end of mulates meter measurements for each accumulation measurement intervals interval. A high-speed synchronous serial port (SSI) Alarms on voltage sag, overvoltage, overcurrent is provided to facilitate high-end metering. Integrated rectifying functions on the battery-backup circuit Low System Cost enable minimal external component usage and Power consumption 30mW at 3.3V typical minimum back-up current. Also, eight multipurpose Real-time clock with temperature compensation pins are provided for control of peripherals. Built-in power-fault detection Single 32kHz crystal time base Single-supply operation (3.3V) 64-lead LQFP package Single Converter Technology is a registered trademark of Maxim Integrated Products, Inc. Page: 1 of 60 2005 2011 Teridian Semiconductor Corporation 1.6 VOLTAGE CURRENT VREF PULSEW PULSER V3P3A GNDA GNDA IA ADC VA CONVERTER GNDD IB MUX VOLT VB V3P3A REG IC V3P3D - VC + 21 GNDD VX VREF VREF GNDD TEMP V2P5 2.5V to logic MUXSYNC VBIAS (1.5V) CALCULATIONS SSI INTERFACE SSCLK SSDATA OUTPUT VALUES: Whr (A, B, C) SFR VARhr (A, B, C) VAhr (A, B, C) SRDY Vrms (A, B, C) Irms (A, B, C) Iphase (A, B, C) Frequency (Selected Phase) Temperature SYSTEM CLOCKS CK GEN CKTEST ALARMS: Voltage Sag (A, B, C) BATTERY BACKUP Zero Cross (Selected Phase) Over-Voltage (All) XIN OSC Over-Current (All) (32KHz) D0-D7 State Change XOUT RTC VBAT PULSE4 PULSE3 DATA CONTROL MISC RAM PULSE INIT BAUDRATE TX IRQZ UART RX I/O CONTROL D0 D4 D1 D5 D2 D6 D3 Change of State D7 (D0...D7) TEST VFLT VBIAS GNDD (1.5V) V3P3 FAULT DETECT TMUXOUT VX RESERVED March 3, 2008 64 PINS -- 64 TQFP RESETZ Figure 2: IC Functional Block Diagram ELECTRICAL SPECIFICATIONS Page: 2 of 60 20052011 Teridian Semiconductor Corporation 1.6