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PDF 71M6545T Data sheet ( Hoja de datos )
| Número de pieza | 71M6545T | |
| Descripción | Energy Meter ICs | |
| Fabricantes | Maxim Integrated | |
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71M6545T/71M6545HT
EVALUATION KIT AVAILABLE
Energy Meter ICs
General Description
The 71M6545T/71M6545HT metrology processors are
based on Maxim Integrated’s 4th-generation metering
architecture supporting the 71M6xxx series of isolated
current sensing products that offer drastic reduction in
component count, immunity to magnetic tampering, and
unparalleled reliability. The 71M6545T/71M6545HT inte-
grate our Single Converter Technology® with a 22-bit
delta sigma ADC, a customizable 32-bit computation
engine (CE) for core metrology functions, as well as a
user-programmable 8051-compatible application proces-
sor (MPU) core with 64KB flash and 5KB RAM.
An external host processor can access metrology func-
tions directly through the SPI interface, or alternatively
through the embedded MPU core in applications requir-
ing metrology data capture, storage, and preprocessing
within the metrology subsystem. In addition, the devices
integrate an RTC, DIO, and UART. A complete array of
ICE and development tools, programming libraries, and
reference designs enable rapid development and certi-
fication of meters that meet all ANSI and IEC electricity
metering standards worldwide.
The 71M6545T/71M6545HT operate over the industrial tem-
perature range and come in a 64-pin lead(Pb)-free package.
Applications
● Three-Phase Residential, Commercial, and Industrial
Energy Meters
Ordering Information and Typical Operating Circuit appear
at end of data sheet.
Benefit and Features
● SoC Integration and Unique Isolation Technique
Reduces BOM Cost Without Sacrificing Performance
• 0.1% Typical Accuracy Over 2000:1 Current
Range
• Exceeds IEC 62053/ANSI C12.20 Standards
• Four-Quadrant Metering
• 46-64Hz Line Frequency Range with the Same
Calibration
• Phase Compensation (±10º)
• Independent 32-Bit Compute Engine
• 64KB Flash, 5KB RAM
• Built-In Flash Security
• SPI Interface to Host with Flash Program
Capability
• Up to Four Pulse Outputs with Pulse Count
• 8-Bit MPU (80515), Up to 5 MIPS (Optional Use)
• Full-Speed MPU Clock in Brownout Mode
• Up to 29 Multifunction DIO Pins
• Hardware Watchdog Timer (WDT)
• UART for AMR or Other Communication Duties
• I2C/MICROWIRE® EEPROM Interface
● Innovative Isolation Technology (Requires
Companion 71M6xxx Sensor, also from Maxim
Integrated) Eliminates Current Transformers
• Four Current Sensor Inputs with Selectable
Differential Mode
• Selectable Gain of 1 or 8 for One Current Input to
Support Neutral Current Shunt
• High-Speed Wh/VARh Pulse Outputs with
Programmable Width
● Digital Temperature Compensation Improves System
Performance
• Metrology Compensation
• Accurate RTC for TOU Functions with Automatic
Temperature Compensation for Crystal in All
Power Modes
● Power Management Extends Battery Life During
Power Outages
• Two Battery-Backup Modes:
Brownout Mode (BRN)
Sleep Mode (SLP)
• Wake-Up on Pin Events and Wake-On Timer
• 1µA in Sleep Mode
Single Converter Technology is a registered trademark of
Maxim Integrated Products, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
19-6721; Rev 4; 1/15
1 page  
71M6545T/71M6545HT
Energy Meter ICs
LIST OF FIGURES
Figure 1. I/O Equivalent Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 2. 71M6545T/HT Operating with Local Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 3. 71M6545T/HT Operating with Remote Sensor for Neutral Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 4. Multiplexer Sequence with Neutral Channel and Remote Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 5. Multiplexer Sequence with Neutral Channel and Current Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 6. Waveforms Comparing Voltage, Current, Energy per Interval, and Accumulated Energy . . . . . . . . . . . . . . 35
Figure 7. Typical Voltage Sense Circuit Using Resistive Divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 8. Typical Current-Sense Circuit Using Current Transformer in a Single-Ended Configuration . . . . . . . . . . . . 37
Figure 9. Typical Current-Sense Circuit Using Current Transformer in a Differential Configuration . . . . . . . . . . . . . . 37
Figure 10. Typical Current-Sense Circuit Using Shunt in a Differential Configuration . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 11. 71M6545T/HT Typical Operating Circuit Using Locally Connected Sensors . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 12. 71M6545T/HT Typical Operating Circuit Using Remote Neutral Current Sensor . . . . . . . . . . . . . . . . . . . . 39
Figure 13. Typical I2C Operating Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 14. Typical UART Operating Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 15. Typical Reset Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 16. Typical Emulator Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 17. CE Data Flow—Multiplexer and ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 18. CE Data Flow— Offset, Gain, and Phase Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 19. CE Data Flow—Squaring and Summation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
71M6545T/71M6545HT
Energy Meter ICs
Electrical Characteristics (continued)
(Limits are production tested at TA = +25ºC. Limits over the operating temperature range and relevant supply voltage range are guar-
anteed by design and characterization.)
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
LSB Size
FIR_LEN = 2, ADC_DIV = 1, PLL_FAST = 1, MUX_
DIV = 2
151
nV
Digital Full Scale
FIR_LEN = 2, ADC_DIV = 1, PLL_FAST = 1, MUX_
DIV = 2
±2,097,152
LSB
PREAMPLIFIER
Differential Gain
7.88
7.98
8.08 V/V
Gain Variation vs. Temperature
Gain Variation vs. V3P3
Phase Shift
TA = -40°C to +85°C (Note 1)
VV3P3 = 2.97V to 3.63V (Note 1)
(Note 1)
-30
-100
+10
-10 +15 ppm/°C
+100 ppm/%
+22 m°
Preamp Input Current
3 6 9 µA
THD, Preamp + ADC
Preamp Input Offset Voltage
Phase Shift Over Temperature
VIN = 30mV
VIN = 15mV
IADC0 = IADC1 = VV3P3 + 30mV
IADC0 = IADC1 = VV3P3 + 15mV
IADC0 = IADC1 = VV3P3
IADC0 = IADC1 = VV3P3 - 15mV
IADC0 = IADC1 = VV3P3 - 30mV
(Note 1)
-0.03
-88
-88
-0.63
-0.57
-0.56
-0.56
-0.55
dB
mV
+0.03 m°/C
FLASH MEMORY
Endurance
20,000
Cycles
Data Retention
Byte Writes Between Erase
Operations
TA = +25°C
100 Years
2 Cycles
Write Time, per Byte
Per 2 bytes if using SPI
50 µs
Page Erase Time
22 ms
Mass Erase Time
22 ms
SPI
Data-to-Clock Setup Time
10 ns
Data Hold Time From Clock
10 ns
Output Delay, Clock to Data
40 ns
CS-to-Clock Setup Time
10 ns
Hold Time, CS to Clock
15 ns
Clock High Period
40 ns
Clock Low Period
40 ns
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet 71M6545T.PDF ] | |
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