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
(AFE) IC that provides measurements for 3-quadrant
3-phase metering. The combination of a 21-bit
sigma-delta A/D converter with a six-input analog
front-end, a thermally compensated high-precision
reference, and a compute engine results in high
accuracy and wide dynamic range. Our Single
Converter Technology® reduces cross talk and cost.
This IC also provides RTC and battery backup for
time-of-use (TOU) metering.
High Accuracy
< 0.1% Wh accuracy over 2000:1 range
Exceeds IEC 62053/ANSIC 12.20 specifications
Up to 10ppm/C precision ultra-stable voltage
reference
Single Converter Technology reduces cross talk
and power consumption
Six sensor inputs—referenced to V3P3
Compatible with CTs, resistive shunts and
Rogowski Coil sensors
Digital temperature compensation
Sag detection
Measures Wh, VARh, VAh, Vrms, Irms, V-to-V
phase and load angle on each phase
Four-quadrant metering.
Battery
Four low-jitter pulse outputs from selectable
measurements
Four pulse count registers
UART, IRQZ
RTC
Selectable default status for pulse pins
Same calibration data for 46Hz to 64Hz line
frequency
HOST
RAM
COMPUTE
PRO-
ENGINE
CESSOR
SSI
Broad CT phase compensation (±7deg)
VOLTAGE
REFERENCE
CONTROL
Battery Backup
Powers real-time clock during power supply
outage
Compatible with Li-ion, NiCd, or super capacitor
Battery backup current 2µA typical at 25°C
DIO
TERIDIAN 71M6515H
External Data Interface
Figure 1: Meter Block Diagram
UART control interface, two selectable data rates
8 general-purpose I/O pins with alarm capability
5 or 10MHz selectable high-speed synchronous
serial output for DSP interface
IRQ output signal for alarms and end of
measurement intervals
As shown in the block diagram (Figure 1), the host
processor communicates with the 71M6515H
through a UART interface using the programmable
IRQZ interrupt. The 71M6515H calculates and accu-
mulates meter measurements for each accumulation
interval. A high-speed synchronous serial port (SSI)
is provided to facilitate high-end metering. Integrated
rectifying functions on the battery-backup circuit
enable minimal external component usage and
minimum back-up current. Also, eight multipurpose
pins are provided for control of peripherals.
Alarms on voltage sag, overvoltage, overcurrent
Low System Cost
Power consumption 30mW at 3.3V typical
Real-time clock with temperature compensation
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.
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© 20052011 Teridian Semiconductor Corporation
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