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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

1.6

VREF

IA

VA

IB

VB

IC

VC

∆Σ

ADC

CONVERTER

MUX

V3P3A

-

+

PULSEW

PULSER

V3P3A

GNDA

GNDD

VOLT

REG

21

GNDD

V2P5

2.5V to logic

V3P3D

VX

TEMP

VREF

MUXSYNC

VBIAS

(1.5V)

CALCULATIONS

SSI INTERFACE

OUTPUT VALUES:

Whr (A, B, C)

VARhr (A, B, C)

VAhr (A, B, C)

Vrms (A, B, C)

Irms (A, B, C)

Iphase (A, B, C)

Frequency (Selected Phase)

Temperature

SYSTEM CLOCKS

SSCLK

SSDATA

SFR

SRDY

CK_GEN

ALARMS:

Voltage Sag (A, B, C)

Zero Cross (Selected Phase)

Over-Voltage (All)

Over-Current (All)

D0-D7 State Change

BATTERY BACKUP

OSC

(32KHz)

CKTEST

XIN

XOUT

RTC

VBAT

PULSE4

PULSE3

PULSE_INIT

BAUDRATE

TX

UART

RX

D0

D1

D2

D3

Change of State

(D0...D7)

I/O CONTROL

D4

D5

D6

D7

MISC

CONTROL

DATA

RAM

IRQZ

TEST

VFLT

FAULT DETECT

VX

RESERVED

64 PINS -- 64 TQFP

RESETZ

March 3, 2008

VBIAS

(1.5V)

V3P3

GNDD

TMUXOUT

Figure 2: IC Functional Block Diagram

ELECTRICAL SPECIFICATIONS

Page: 2 of 60

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

1.6

A Maxim Integrated Products Brand

71M6515H

Energy Meter IC

DATA SHEET

JULY 2011

LOGIC LEVELS

PARAMETER

Digital high-level input voltage, V

IH

Digital low-level input voltage, V

IL

I

LOAD

= 1mA

Digital high-level output voltage V

OH

I

LOAD

= 15mA

Digital low-level output voltage V

OL

Input pull-up current, I

IL

RESETZ

E_RXTX, E_ISYNC/BRKRQ

E_RST

Other digital inputs

Input pull down current, I

IH

TEST

Other digital inputs

1

CONDITION

MIN

2

−0.3

V3P3D

–0.4

V3P3D-

0.6

1

0

TYP

MAX

V3P3D

0.8

V3P3D

UNIT

V

I

LOAD

= 1mA

I

LOAD

= 15mA

VIN=0V

0.4

0.8

1

100

+1

100

+1

V

µA

10

-1

VIN=V3P3D

10

-1

Guaranteed by design; not production tested.

SUPPLY CURRENT

PARAMETER

V3P3A + V3P3D

V3P3A

current

V3P3D

current

VBAT

current

VBAT

current,

VBAT=3.6V

CONDITION

Normal Operation,

V3P3A=V3P3D=3.3V

VBAT=3.6V

-300

Battery backup,

≤25°C

V3P3A=V3P3D=0V

85°C

f

OSC

= 32kHz

2

4

MIN

TYP

8.8

3.7

5.1

MAX

11.5

4.7

6.8

300

4

12

1

UNIT

mA

nA

µA

1

Guaranteed by design; not production tested.

VREF

Page: 4 of 60

1.6

A Maxim Integrated Products Brand

71M6515H

Energy Meter IC

DATA SHEET

JULY 2011

CONDITION

MIN

TYP

MAX

UNIT

V

kΩ

V

PARAMETER

VREF

output voltage, VNOM(25)

VREF

output impedance

VNOM

definition

2

Ta = 25ºC

1.193

1.195

1.197

I

LOAD

= 10µA, -10µA

2.5

2

VNOM(T) = VREF(22) + (T-22)TC1 + (T-22) TC2

1

VREF(T)

deviation from VNOM(T)

VREF

(

T

)

−

VNOM

(

T

)

10

6

VNOM

max(|

T

−

22 |,40)

Ta = -40ºC to +85ºC, for

71M6515H-IGT/F

-10

+10

PPM/ºC

Ta = -40ºC to +85ºC, for

71M6515H-IGTW/F

-40

1

+40

1

PPM/ºC

VREF

aging

1

2

±25

PPM/year

Guaranteed by design; not production tested.

This relationship describes the nominal behavior of VREF at different temperatures. The values of TC1 and TC2 are device

specific in general and are programmed into the device at manufacturing.

Page: 5 of 60

1.6

71M6515H-IGTW1

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