19-5361; Rev 7/11
A Maxim Integrated Products Brand
71M6515H
Energy Meter IC
DATA SHEET
JULY 2011
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.
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
CURRENT
VOLTAGE
Battery
RTC
COMPUTE
ENGINE
VOLTAGE
REFERENCE
RAM
UART, IRQZ
HOST
PRO-
CESSOR
SSI
CONTROL
DIO
TERIDIAN 71M6515H
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.
Page: 1 of 60
© 20052011 Teridian Semiconductor Corporation
1.6
A Maxim Integrated Products Brand
71M6515H
Energy Meter IC
DATA SHEET
JULY 2011
ABSOLUTE MAXIMUM RATINGS
Supplies and Ground Pins:
V3P3D, V3P3A
|V3P3D – V3P3A|
VBAT
GNDD
Analog Output Pins:
VREF
V2P5
Analog Input Pins:
IA, VA, IB, VB, IC, VC
VFLT, VX
XIN, XOUT
Digital Input Pins:
RX
D0…D7
All other pins
Operating junction temperature (peak, 100ms)
Operating junction temperature (continuous)
Storage temperature
Solder temperature – 10 second duration
ESD Stress
Pins IA, VA, IB, VB, IC, VC, RX, TX
All other pins
−0.5V
to 4.6V
0V to 0.5V
-0.5V to 4.6V
-0.5V to +0.5V
-1mA to 1mA,
-0.5V to V3P3A+0.5V
-1mA to 1mA,
-0.5 to 3.0V
-0.5V to V3P3A+1.0V
-0.5V to V3P3A+0.5V
-0.5V to 3.0V
-0.5V to 3.6V
-0.5V to 6V
-0.5V to V3P3D+0.5V
140 °C
125 °C
−45
°C to 165 °C
250 °C
6kV
2kV
Stresses beyond Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional
operation at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability. All voltages are with respect to GNDA.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
3.3V Supply Voltage (V3P3A,
V3P3D)
+
VBAT
Operating Temperature
+
CONDITION
Normal Operation
Battery Backup
No Battery
Battery Backup
MIN
TYP
MAX
UNIT
3.0
3.3
3.6
V
0
3.8
V
Externally Connect to V3P3D
2.0
3.8
V
-40
85
ºC
V3P3A and V3P3D should be shorted together on the circuit board. GNDD and GNDA should also be shorted on the circuit board.
Page: 3 of 60
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