71M6515H_11 Datasheet, PDF (1/60 Pages) Teridian Semiconductor Corporation – Up to 10ppmC precision ultra-stable voltage reference Digital temperature compensation

A Maxim Integrated Products Brand
GENERAL DESCRIPTION
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.
Battery
RTC
COMPUTE
ENGINE
VOLTAGE
REFERENCE
RAM
CONTROL
TERIDIAN 71M6515H
UART, IRQZ
SSI
HOST
PRO-
CESSOR
DIO
Figure 1: Meter Block Diagram
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.
Single Converter Technology is a registered trademark of
Maxim Integrated Products, Inc.
19-5361; Rev 7/11
71M6515H
Energy Meter IC
DATA SHEET
JULY 2011
FEATURES
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.
 Four low-jitter pulse outputs from selectable
measurements
 Four pulse count registers
 Selectable default status for pulse pins
 Same calibration data for 46Hz to 64Hz line
frequency
 Broad CT phase compensation (±7deg)
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
External Data Interface
 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
 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
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© 20052011 Teridian Semiconductor Corporation
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