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71M6601 Schematic ( PDF Datasheet ) - Maxim Integrated

Teilenummer 71M6601
Beschreibung Isolated Sensor ICs
Hersteller Maxim Integrated
Logo Maxim Integrated Logo 




Gesamt 19 Seiten
71M6601 Datasheet, Funktion
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.
FEATURES
0.1% Accuracy Over 2000:1 Current
Range
Exceeds IEC 62053/ANSI C12.20
Standards
Compatible with Shunt Resistors as Low
as 50µΩ
On-Chip Temperature Sensor Enables
Localized Digital Temperature
Compensation by the 71M654x
22-Bit ADC
Powered from the 71M654x Using Pulses
Sent Through the Transformer
3.3mW Typical Consumption
On-Chip Power Monitoring
Industrial Temperature Range
8-Pin Lead(Pb)-Free SO Package
Shunt Current Sensors
C
NEUTRAL
B
A
LOAD
POWER SUPPLY
NEUTRAL
Note: This system is referenced to Neutral
3x 71M6xx3
Pulse Transformers
AMR
IR
HOST
MUX and ADC
IADC0
IADC1
}IN*
VADC10 (VC)
I
I
ADC
ADC
6
7
}IC
VADC9 (VB)
IADC4
IADC5
}IB
VADC8 (VA)
IADC2
IADC3
}IA
V3P3A V3P3SYS GNDA GNDD
71M6543F/
71M6543H
PWR MODE
CONTROL
WAKE-UP
REGULATOR
VBAT
VBAT_RTC
TEMPERATURE BATTERY
SENSOR
MONITOR
VREF
SERIAL PORTS
TX
RX
MODUL- RX
ATOR TX
POWER FAULT
COMPARATOR
SPI INTERFACE
RAM
COMPUTE
ENGINE
FLASH
MEMORY
MPU
RTC
TIMERS
ICE
COM0...5
SEG
SEG/DIO
LCD DRIVER
DIO, PULSES
DIO
V3P3D
OSCILLATOR/
PLL
XIN
XOUT
*IN = Neutral Current
9/17/2010
BATTERY
RTC
BATTERY
LCD DISPLAY
8888.8888
PULSES,
DIO
I2C or µWire
EEPROM
32 kHz
For pricing, delivery, and ordering information, please contact Maxim Direct at
19-5704; Rev 3; 12/12
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.






71M6601 Datasheet, Funktion
71M6xxx Data Sheet
The shunt resistance must be balanced with the maximum current range of the part type, as shown in
Table 2. Various combinations of current ranges and shunt resistance values are possible. However, the
shunt resistance for a given current has to be chosen carefully as not to exceed the maximum RMS
voltage at the INP/INN pins of the 71M6xxx. The maximum wattage of the shunt resistor is another
consideration that applies to the resistance range of the shunt.
Table 2: Product Variations
Part
71M6601
71M6603
Application1
Maximum
Current
(A)
Accuracy
Class2
(%)
S1
60
P1
Maximum
RMS
Voltage at
INP/INN
(mV)
44
Maximum
Shunt
Resistance3
(µΩ)
Shunt
Power4
(W)
Typical
Shunt
Resistance5
(µΩ)
736 1.44 400
71M6103
71M6113
P
1
100 0.5
19.6
196 1.2 120
71M6201
71M6203
S
P
0.2
200 0.2
12.6
63 2.0 50
Note 1: S = single phase, P = polyphase.
Note 2: Accuracy over temperature (-40°C to +85°C for 71M620x parts, -20°C to +60° for all other parts), when combined with
71M654x or 71M654xH IC.
Note 3: Maximum resistance at maximum current.
Note 4: Power at maximum current and typical shunt resistance.
Note 5: Typical resistance values provide room for overhead while maintaining optimum dynamic range.
The inputs of the preamplifier are referenced to local ground (the GND pin of the 71M6xxx). This means
that in an isolated system, the INP and INN pins have to be biased towards this local GND. See 3.2.1
Current Sensor Side for details.
3.2 External Components for the 71M6xxx
3.2.1 Current Sensor Side
Figure 2 shows the external components required for the 71M6xxx. It is recommended to use the
following components:
1.0µF capacitor between the GND and VCC pins. This capacitor minimizes the VCC ripple
voltage.
One 1kresistor each from the sensor output pins to GND. These resistors help to bias the input
voltage at the INP and INN pins towards GND.
In environments where EMC is a concern, ferrite beads can be placed between the sense pins of
the shunt resistor and the INP/INN pins of the 71M6xxx.
3.2.2 Pulse Transformer
A low-cost pulse transformer is used for the link between the 71M654x and the 71M6xxx. It is the
responsibility of the meter system designer to qualify the transformer used in the system over the required
operating temperature range. The following commercially available transformer is suitable for this
application:
Würth Electronics Midcom Inc., P/N 750-11-0056 REV 2 (www.midcom-inc.com)
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71M6601 pdf, datenblatt
71M6xxx Data Sheet
4.4 Performance Specifications
Unless otherwise specified, all parameters listed in this section are valid over the Recommended
Operating Conditions provided in Table 5.
4.4.1 Supply Current
Table 6: Supply Current Performance Specifications
PARAMETER
VCC Current, Normal Operation
CONDITIONS
VCC = 3.3V
MIN TYP MAX UNITS
0.77 1.05
mA
4.4.2 Power and Data Pulses
Table 7: Timing Specifications for Power and Data Pulses
PARAMETER
Pulse Frequency
CONDITIONS
Normal operation
71M654x (PLL_FAST = 0)
MIN TYP
1.638
0.5249
MAX
UNITS
MHz
4.4.3 VCC Voltage Monitor
Table 8: VCC Voltage Monitor Specifications
PARAMETER
CONDITIONS
MIN TYP
BNOM: Nominal Value, TA = +22°C
VCC = 3.2V
138
VCC Voltage (Note: This is a definition— VCC = 3.195 + (BSENSE - 138) x 0.0246 + STEMP x
it is not a measured quantity.)
0.000104
BE: Measurement Error
VCC = 2.5V
VCC = 3.195 + (BSENSE - 138) x 0.0246
+ STEMP x 0.000104
VCC = 2.8V to 3.6V
-5
-5
MAX
+5
+5
4.4.4 Temperature Sensor
Table 9: Temperature Sensor Specifications
PARAMETER
TNOM: Nominal Value, TA = +22°C
Temperature Equation for:
71M6601, 71M6603, 71M6103 and
71M6113
(Note: This is a definition—it is not a
measured quantity.)
Temperature Equation for:
71M6201 and 71M6203
(Note: This is a definition—it is not a
measured quantity.)
Temperature Error (Note 1)
CONDITIONS
VCC = 3.2V
MIN TYP
870
TEMP = STEMP x 0.33 - STEMP2 x 3E-5 + 22
If STEMP < 0:
TEMP = STEMP x 0.33 - STEMP2 x 3E-5 + 22
If STEMP 0:
TEMP = STEMP x (63 / TRIMBGA) + 22
VCC =
Temperature =
-40°C, -10°C,
+55°C, +85°C
2.8V to
3.6V
VCC =
2.5V to
-5
-6.5
2.79V
TETIME: Duration of Temperature
Measurement
VCC = 3.0V
15
Note 1: Guaranteed by design; not production tested.
MAX
+5
+6.5
30
UNITS
LSB
V
%
UNITS
LSB
ºC
C
ºC
ms
12

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