Maxim71M6521 high precision and highly integrated electricity meter solution

/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a >/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/ a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a> /a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a >/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/ a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a> /a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a >/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/ a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a> /a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a >/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/ a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a> /a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a >/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/ a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a> /a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a >/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/ a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>/a>

Maxim’s 71M6521DE/DH/FE meter system-on-chip (SoC) integrates MPU core, RTC, flash memory and LCD. Single-converter technology features 22SigMa-Delta ADC, four analog inputs, digital temperature compensation, precision voltage reference, Battery voltage monitor and 32-bit Compute Engine (CE). This article introduces 71M6521DE/DH/FE main features, block diagram, 71M6521 demo board and debug board block diagram, and 71M6521 demo board main specifications, D6521T4A7/8/10 demo board circuit diagram , bill of materials and PCB layout.

The Teridian™ 71M6521DE/DH/FE energy meter ICs are highly integrated systems-on-a-chip (SoCs) with an MPU core, RTC, flash, and LCD driver. The Single Converter Technology® with a 22-bit delta-sigma ADC, four analog inputs, digital temperature compensation, precision voltage reference, battery voltage monitor, and 32-bit computation engine (CE) supports a wide range of residential metering applications with very few low-cost external components. A 32kHz crystal time base for the entire system and internal battery-backup support for RAM and RTC further reduce system cost. The ICs support 2-wire, 3-wire, and 4-wire single-phase and dual-phase residential metering along with tamper-detection mechanisms.

Maximum design flexibility is provided by multiple UARTs, I2C, MICROWIRE®, up to 18 DIO pins, and in-system programmable flash memory, which can be updated with data or application code in operation.

A complete array of ICE and development tools, programming libraries, and reference designs enable rapid development and certification of TOU, AMR, and prepay meters that comply with worldwide electricity metering standards.

The Teridian™ 71M6521DE/DH/FE energy meter ICs are highly integrated systems-on-a-chip (SoCs) with an MPU core, RTC, flash, and LCD driver. The Single Converter Technology® with a 22-bit delta-sigma ADC, four analog inputs, digital temperature compensation, precision voltage reference, battery voltage monitor, and 32-bit computation engine (CE) supports a wide range of residential metering applications with very few low-cost external components. A 32kHz crystal time base for the entire system and internal battery-backup support for RAM and RTC further reduce system cost. The ICs support 2-wire, 3-wire, and 4-wire single-phase and dual-phase residential metering along with tamper-detection mechanisms.

Maximum design flexibility is provided by multiple UARTs, I2C, MICROWIRE®, up to 18 DIO pins, and in-system programmable flash memory, which can be updated with data or application code in operation.

A complete array of ICE and development tools, programming libraries, and reference designs enable rapid development and certification of TOU, AMR, and prepay meters that comply with worldwide electricity metering standards.

71M6521DE/DH/FE main features:

• Up to 0.1% Wh Accuracy Over 2000:1 Current Range

• Exceeds IEC 62053/ANSI C 12.20 Standards

• Voltage Reference

•Four Sensor Inputs—VDD Referenced

•Low-Jitter Wh and VARh Pulse Test Outputs (10kHz max)

• Pulse Count for Pulse Outputs

•Four-Quadrant Metering

• Tamper Detection

Neutral Current with CT or Shunt

•Line Frequency Count for RTC

•Digital Temperature Compensation

•Sag Detection for Phase A and B

•Independent 32-Bit Compute Engine

•46-64Hz Line Frequency Range with Same Calibration

• Phase Compensation (?7?)

•Battery backup for RTC and battery monitor

•Three Battery Modes with Wake-Up on Pushbutton or Timer:

Brownout Mode (48μA)

LCD Mode (5.7μA)

Sleep Mode (2.9μA)

•Energy Display on Main Power Failure

•Wake-Up with Pushbutton

• 22-Bit Delta-Sigma ADC

•8-Bit MPU (80515), 1 Clock Cycle per Instruction with Integrated ICE for MPU Debug

•RTC with Temperature Compensation

•Auto-Calibration

•Hardware Watchdog Timer, Power-Fail Monitor

•LCD Driver (Up to 152 Pixels)

•Up to 18 General-Purpose I/O Pins

• 32kHz Time Base

•16KB (6521DE/DH) or 32KB (6521FE) Flash with Security

• 2KB MPU XRAM

•Two UARTs for IR and AMR

•Digital I/O Pins Compatible with 5V Inputs

•64-Pin LQFP or 68-Pin QFN Package

• Lead(Pb)-Free Packages

Maxim71M6521 high precision and highly integrated electricity meter solution
Figure 1.71M6521 block diagram

71M6521 Demo Board

The TERIDIAN semiconductor Corporation (TSC) 71M6521 Demo Board is an energy meter IC demonstration board for evaluating the 71M6521 device for single-phase Electronic energy metering applications. It incorporates a 71M6521 integrated circuit, peripheral circuitry such as a serial EEPROM, emulator port, and on-board power supply as well as a companion Debug Board that allows a connection to a PC through a RS232 port. The Demo Board allows the evaluation of the 71M6521 energy meter controller chip for measurement accuracy and overall system use. The board is pre- programmed with a Demo Program (file name 6521_demo.hex) in the FLASH memory of the 71M6521 IC. This embedded application is developed to exercise all low-level functions to directly manage the peripherals and CPU (clock, timing, power savings, etc. ).

Figure 2.71M6521 Demo Board Outline Drawing

The 71M6521 demo board includes:

71M6521 Demo Board containing 71M6521FE IC with preloaded Demo Program

Shunt resistor with harness, connected to Demo Board

Debug Board

Two 5VDC/1,000mA universal wall transformers w/ 2.5mm plug (Switchcraft 712A)

Serial cable, DB9, Male/Female, 2m length (Digi-Key AE1020-ND)

CD-ROM containing documentation (data sheet, board schematics, BOM, layout), Demo Code, and utilities

Adapter PCB (ICE connector to 6X1 header, D6521T4A10 only)

Connector adapter for 5 VDC supply (D6521T4A10 only, optional)


Figure 3.71M6521 Demo Board and Debug Board Block Diagram (CT Configuration)
The main indicators of the 71M6521 demo board:


Figure 4. D6521T4A7 demo board circuit diagram (1)

Figure 5. D6521T4A7 demo board circuit diagram (2)

Figure 6. D6521T4A8 Demo Board Circuit Diagram (1)

Figure 7. D6521T4A8 Demo Board Circuit Diagram (2)

Figure 8. D6521T4A10 Demo Board Circuit Diagram (1)

Figure 9. D6521T4A10 Demo Board Circuit Diagram (2)

Figure 10. D6521T4A10 Demo Board Circuit Diagram (3)

D6521T4A7 Demo Board Bill of Materials:

D6521T4A8 Demo Board Bill of Materials:

D6521T4A10 Demo Board Bill of Materials:


Figure 11. D6521T4A7 Demo Board PCB Layout (Top Layer)

Figure 12. D6521T4A7 demo board PCB layout (bottom layer)
For details, see:
http://datasheets.maxim-ic.com/en/ds/71M6521DE-71M6521FE.pdf
and
http://datasheets.maxim-ic.com/en/ds/71M6521FE-DB.pdf

The Links:   LM64K102 SKM50GB12T4