71M6103/71M6113/
71M6201/71M6203/
71M6601/71M6603
Isolated Sensor ICs
DATA SHEET
GENERAL DESCRIPTION
The 71M6103/71M6113/71M6201/71M6203/71M6601/71M6603
(71M6xxx) isolated sensor ICs enable Maxim Integrated’s 4th-
generation polyphase-metering 71M654x systems-on-chips
(SoCs) to use nonisolating sensors such as resistive shunts
without the need for costly and nonlinear isolation transformers
or CTs. Isolation is provided by low-cost pulse transformers that
form a bidirectional digital communication link between the
71M654x and the isolated sensor ICs.
The 71M6xxx isolated sensor ICs contain a 22-bit delta-sigma
ADC, an amplifier with differential inputs, a precision voltage
reference, a temperature sensor, and a supply voltage generator
that is energized by power pulses provided by the 71M654x.
In conjunction with the 71M654x metering SoCs, the isolated
sensor ICs offer unprecedented BOM cost reduction, immunity to
magnetic tampering, and enhanced reliability for single-phase
and polyphase applications.
These metering SoCs operate over the industrial temperature
range and are available in an 8-pin lead(Pb)-free SO package.
BENEFITS AND FEATURES
•
Reduce BOM by Replacing Expensive
Current Transformers with Current Shunts
•
Compatible with Shunt Resistors as
Low as 50µΩ
•
Accurate Measurement
•
22-Bit ADC
•
On-Chip Power Monitoring
•
Exceeds IEC 62053/ANSI C12.20
Standards
•
Galvanic Isolation Through Pulse
Transformer Provides Power, Bidirectional
Data, and Timing Reference
•
3.3mW Typical Consumption
•
On-Chip Power Monitoring
C
NEUTRAL
B
A
Shunt Current Sensors
LOAD
POWER SUPPLY
NEUTRAL
71M6xx3
71M6xx3
71M6xx3
Note: This system is referenced to Neutral
3x 71M6xx3
Resistor Dividers
Pulse Transformers
MUX and ADC
IADC0
IADC1
}
IN*
VADC10 (VC)
IADC6
IADC7
}
IC
VADC9 (VB)
IADC4
IADC5
}
IB
VADC8 (VA)
IADC2
IADC3
}
IA
VREF
SERIAL PORTS
V3P3A V3P3SYS GNDA GNDD
PWR MODE
CONTROL
71M6543F/
71M6543H
WAKE-UP
REGULATOR
VBAT
VBAT_RTC
BATTERY
MONITOR
RTC
BATTERY
BATTERY
TEMPERATURE
SENSOR
RAM
COMPUTE
ENGINE
FLASH
MEMORY
COM0...5
SEG
SEG/DIO
LCD DRIVER
DIO, PULSES
DIO
LCD DISPLAY
AMR
TX
RX
MODUL- RX
ATOR TX
POWER FAULT
COMPARATOR
8888.8888
PULSES,
DIO
I
2
C or µWire
EEPROM
32 kHz
IR
MPU
RTC
TIMERS
ICE
V3P3D
OSCILLATOR/
PLL
XIN
XOUT
9/17/2010
HOST
SPI INTERFACE
*IN = Neutral Current
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-5704; Rev 4; 1/15
71M6xxx Data Sheet
Table of Contents
1
2
3
3.1
3.2
Hardware Description ................................................................................................................. 4
Functional Description ............................................................................................................... 4
Applications Information ........................................................................................................... 5
Product Selection ...................................................................................................................... 5
External Components for the 71M6xxx ................................................................................... 6
3.2.1 Current Sensor Side ........................................................................................................ 6
3.2.2 Pulse Transformer ........................................................................................................... 6
3.3
3.4
3.5
4
4.1
4.2
4.3
4.4
Connections to Sensors and to the 71M654x ......................................................................... 7
PCB Layout Considerations ..................................................................................................... 9
Compatibility with the 71M654x ............................................................................................. 10
Specifications............................................................................................................................ 11
Absolute Maximum Ratings .................................................................................................... 11
Recommended External Components ................................................................................... 11
Recommended Operating Conditions ................................................................................... 11
Performance Specifications.................................................................................................... 12
4.4.1 Supply Current ............................................................................................................... 12
4.4.2 Power and Data Pulses ................................................................................................. 12
4.4.3 VCC Voltage Monitor ..................................................................................................... 12
4.4.4 Temperature Sensor ...................................................................................................... 12
4.4.5 VREF Performance Specifications ................................................................................ 13
4.4.6 ADC Converter............................................................................................................... 14
4.5
4.6
4.7
4.8
5
6
7
Typical Performance Data ....................................................................................................... 15
Package Outline Drawing ........................................................................................................ 16
IC Pinout ................................................................................................................................... 17
Pin Description ......................................................................................................................... 17
Ordering Information ................................................................................................................ 18
Related Information .................................................................................................................. 18
Contact Information .................................................................................................................. 18
2
71M6xxx Data Sheet
List of Figures
Figure 1: Block Diagram ................................................................................................................................ 4
Figure 2: External Components Connected to the 71M6xxx ........................................................................ 7
Figure 3: Current Sensors Connected to the 71M6541D/F Using One 71M6x01 ........................................ 8
Figure 4: Current Sensors Connected to the 71M6543F/H or 71M6545/H with Three 71M6xx3 ................. 9
Figure 5: Copper Separation and Signal Traces for a Polyphase PCB ...................................................... 10
Figure 6: Wh Error at Room Temperature (71M6203, 100A/0.1A, 60Hz/240V AC) ................................... 15
Figure 7: VARh Error at Room Temperature (71M6203, 100A/0.1A, 60Hz/240V AC) ............................... 15
Figure 8: SOIC-8 Package Outline ............................................................................................................. 16
Figure 9: Pinout for 8-Pin SO Package ....................................................................................................... 17
List of Tables
Table 1: Remote Interface Commands ......................................................................................................... 5
Table 2: Product Variations ........................................................................................................................... 6
Table 3: Absolute Maximum Ratings .......................................................................................................... 11
Table 4: Recommended External Components .......................................................................................... 11
Table 5: Recommended Operating Conditions ........................................................................................... 11
Table 6: Supply Current Performance Specifications ................................................................................. 12
Table 7: Timing Specifications for Power and Data Pulses ........................................................................ 12
Table 8: VCC Voltage Monitor Specifications ............................................................................................. 12
Table 9: Temperature Sensor Specifications .............................................................................................. 12
Table 10: VREF Performance Specifications.............................................................................................. 13
Table 11: ADC Converter Specifications .................................................................................................... 14
Table 12: Pin Description ............................................................................................................................ 17
Table 13: Product Variations ....................................................................................................................... 18
Table 14: Packaging Information, Corresponding CE Codes, and Ordering Numbers .............................. 18
3
71M6xxx Data Sheet
1
HARDWARE DESCRIPTION
The 71M6103/71M6113/71M6201/71M6203/71M6601/71M6603 (71M6xxx) remote sensor ICs integrate
all functional blocks required to implement an isolated front-end with digital communication capability.
Figure 1
shows the 71M6xxx IC block diagram. The chip includes the following:
•
•
•
•
•
•
•
•
•
Preamplifier with a fixed gain
22-bit delta-sigma ADC
ADC voltage reference
Temperature sensor
VCC monitor
Power-on reset circuitry
Bidirectional pulse interface
Active rectifiers for supply-voltage generation from the power pulses provided by the 71M654x
Digital control section providing control registers for the selection of operation modes
INP
+
-
SHUNT
-
INN
+
CROSS
ADC_CLK
PREAMP
ADC
VREF
VBIAS
ADC_OUT
BUFFER
VCC
1:1.1
To
71M654X
SP
PLL
PULSEIO
SN
RD_DATA
VDD
RD_CLK
WR_DATA
RD_DATA
DIGITAL SECTION
RESET
DATA_IN[15:0]
ACTIVE
RECTI-
FIERS
CHOP
BAND
GAP
IBIAS
TEMP/VCC
MONITOR
Primary
Secondary
POWER
ON
RESET
OTP MEMORY
GND
VCC
TEST
Figure 1: Block Diagram
2
FUNCTIONAL DESCRIPTION
During normal operation, the SP and SN pins of the 71M6xxx are connected to the pulse transformer.
When
PLL_FAST
= 1 in the 71M654x, power pulses generated by the 71M654x arrive every 610.35ns.
The PLL in the 71M6xxx locks to these incoming power pulses. The communication between the
71M654x and the 71M6xxx is synchronized to the multiplexer frames of the 71M654x. The
communication protocol is Maxim Integrated-proprietary, and details are not described in this data sheet.
All aspects of the communication between the 71M654x and the 71M6xxx are managed on the hardware
level and they are completely transparent to the user.
The communication interface can run at two different data rates. Power pulses are generated every
610.35ns if the
PLL_FAST
register in the 71M654x is set to 1, and every 1.905µs if
PLL_FAST
is set to 0.
The power pulses are 101.7ns wide with
PLL_FAST
= 1, and 160ns wide with
PLL_FAST
= 0.
4
71M6xxx Data Sheet
The 71M6xxx isolated sensors provide a continuous data stream of ADC data plus an independent data
stream that contains auxiliary information as requested by the 71M654x. The ADC data is processed by
CE code in the 71M654x and stored in CE RAM. Auxiliary information is processed by the MPU of the
71M654x using I/O RAM registers.
Basic settings and functions of the 71M6xxx can be controlled by various I/O RAM registers in the
71M654x. The command sent towards the 71M6xxx is placed in the
RCMD[4:2]
register of the 71M654x,
with further specification contained in the
TMUXRn[2:0]
register. Refer to the 71M654x data sheets for
details.
Table 1
shows the allowable combinations of values in
RCMD[4:2]
and
TMUXRn[2:0]
, and the achieved
operation along with the type and format of data sent back by the 71M6xxx isolated sensors.
Table 1: Remote Interface Commands
RCMD[4:2]
001
001
001
001
010
010
010
110
TMUXRn[2:0]
00X
01X
10X
11X
00X
01X
10X
111
Temperature
Supply voltage
Chip version
Reset
Read
Operation/Command
Chip-characteristic
temperature data
R6K_RD
[15:0]
TRIMT
(see note), use bits [8:1]
TRIMBGC
(see note), use bits [15:6]
TRIMBGA
(see note), use bits [15:8]
TRIMBGB
bits [15:8],
TRIMBGD
bits [7:0]
(see note)
Output of the temperature sensor, bits [10:0]
Supply voltage measurement , bits [7:0]
Chip version code, use bits [15:8]
—
Note:
TRIMBGA
to
TRIMBGD
and
TRIMT
are values used for characterizing the individual 71M6xxx over temperature. Availability
of
TRIMBGA
to
TRIMBGD
and
TRIMT
depends on the part number (see
Table 10
for details)
.
The remote interface commands listed in
Table 1
enable the 71M654x to gather the following information
from the 71M6xxx:
•
•
•
•
Output of the temperature sensor
Information on how the device is characterized over temperature
Supply voltage
Chip version code
The control commands listed in
Table 1
enable the 71M654x to initiate the following actions in the
71M6xxx:
•
•
•
Read the 71M6xxx temperature sensor
Read the 71M6xxx VCC sensor
Hardware reset
With hardware and temperature characterization information on each connected 71M6xxx isolated sensor
available to the 71M654x host MPU, temperature compensation of the energy measurement can be
implemented based on the individual temperature characteristics of the 71M6xxx isolated sensors. For
example, when the 71M6xxx are used in a polyphase meter containing three shunt resistors, the
temperature increase in each 71M6xxx can be monitored and used to compensate for the temperature
coefficient of the 71M6xxx VREF and the corresponding shunt resistor.
3
3.1
APPLICATIONS INFORMATION
Product Selection
A low-noise differential-input preamplifier applies gain to the signal from the current sensor to the optimal
input range of the ADC. The current sensor is connected to the inputs of the preamplifier through INP and
INN. The output of the preamplifier connects directly to the input of the ADC. See 5
Ordering Information
for available part types. Shunt resistances from 736µΩ to as low as 50µΩ can be accommodated,
depending on desired current range and part type.
5
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