Maxim Teridian 71M6533 Multiphase Electricity Meter System-on-Chip (SoC) Solution

Maxim’s Teridian™ 71M6533 and 71M6534 are third-generation polyphase meter system-on-chips (SoCs) that integrate a 10MHz 8051-compatible MPU core, a low-power RTC, flash and LCD drivers, and a 22-bit Delta-Sigma ADC. Seven Analog input, digital temperature compensation, precision voltage reference and 32-bit Compute Engine (CE), few external components, support a wide range of energy meter applications. This article introduces the 71M6533/4 main features, functional block diagram, application block diagram and Teridian 71M6533-DB evaluation Board hardware specifications, evaluation board and debug board block diagrams, evaluation board circuit diagrams, bill of materials and PCB component layout diagrams.

The Teridian™ 71M6533 and 71M6534 are third-generation polyphase metering systems-on-chips (SoCs) with a 10MHz 8051-compatible MPU core, low-power RTC, flash, and LCD driver. The Single Converter Technology® with a 22-bit delta-sigma ADC, seven analog inputs, digital temperature compensation, precision voltage reference, and a 32-bit computation engine (CE) supports a wide range of metering applications with very few external components.

The 71M6533 and 71M6534 add several new features to the Teridian flagship 71M6513 polyphase meters, including an SPI interface, advanced power management with < 1μA sleep current, 4KB shared RAM, and 128KB (71M6533/H, 71M6534), or 256KB (71M6533G, 71M6534H ) flash, which can be programmed in the field with new code and/or data during meter operation. Higher processing and sampling rates and larger memory offer a powerful metering platform for commercial and industrial meters with up to class 0.2 accuracy.

A complete array of ICE and development tools, programming libraries and reference designs enable rapid development and certification of meters that meet all ANSI and IEC electricity metering standards worldwide.

71M6533 main features:

• Wh Accuracy < 0.1% Over 2000:1 Range

• Exceeds IEC 62053/ANSI C12.20 Standards

• Seven Sensor Inputs with Neutral Current Measurement

• Low-Jitter Wh and VARh Plus Two Additional Pulse Test Outputs (4 Total, 10kHz max) with Pulse Count

• Four-Quadrant Metering

• Phase Sequencing

• Line Frequency Count for RTC

• Digital Temperature Compensation

• Independent 32-Bit CE

• 46-64 Hz Line Frequency Range with Same Calibration; Phase Compensation (± 7°)

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

Brownout Mode (82μA typ, 71M6533) LCD Mode (21μA typ, DAC active) Sleep Mode (0.7μA typ)

• Energy Display During Mains Power Failure

• 39mW (typ) Consumption at 3.3V, MPU Clock Frequency 614kHz

• 8-Bit MPU (80515), 10MHz (max), One Clock Cycle per Instruction with Integrated ICE for Debug

• LCD Driver with Four Common Segment Drivers:

Up to 228 Pixels (71M6533) or 300 Pixels (71M6534)

• Four Dedicated + 35 (71M6533) or 48 (71M6534) Multifunction DIO Pins

• RTC for TOU Functions with Clock-Rate Adjust Register

• Hardware Watchdog Timer, Power-Fail Monitor

• I2C/MICROWIRE® EEPROM Interface

• High-Speed ​​Slave SPI Interface to Data RAM

• Two UARTs for IR and AMR, IR Driver with Modulation

• Flash Memory with Security and In-System Program Update:

128KB (71M6533/H, 71M6534) 256KB (71M6533G, 71M6534H)

• 4KB RAM

• Industrial Temperature Range

• 100-Pin (71M6533/G/H) or 120-Pin (71M6534/H) Lead(Pb)-Free LQFP Package

Figure 1.71M6533 functional block diagram

Figure 2.71M6533 application block diagram

Teridian 71M6533-DB Evaluation Board

The Teridian™ 71M6533-DB Demo Board is a demonstration board for evaluating the 71M6533 device for 3-phase Electronic power metering applications. It incorporates a 71M6533 integrated circuit, peripheral circuitry such as a serial EEPROM, emulator port, and on-board power supply as well as a USB-to-serial adapter that allows a connection to a PC through the USB port. The demo board allows the evaluation of the 71M6533 energy meter chip for measurement accuracy and overall system use.

The board is pre-programmed with a demo program in the flash memory of the 71M6533 IC. This embedded application is developed to exercise all low-level function calls to directly manage the peripherals, flash programming, and CPU (clock, timing, power savings , etc.).

The 71M6533 IC on the demo board is pre-programmed with default calibration factors. Since current sensors are not part of the Demo Kit, the demo board is tested but not calibrated at the factory.

The Teridian 71M6533-DB evaluation board includes:

 71M6533-DB Demo Board with 71M6533F IC and Pre-Loaded Demo Program
 USB-to-Serial Adapter

 5VDC/1000mA Universal Wall Transformer with 2.5mm Plug (Switchcraft 712A Compatible)

 USB Cable

Figure 3. Teridian 71M6533-DB Evaluation Board and Debug Board Block Diagram

Figure 4. Teridian 71M6533-DB Evaluation Board and USB-Serial Adapter Outline Drawing
Teridian 71M6533-DB Evaluation Board Hardware Specifications:


Figure 5. Teridian 71M6533-DB evaluation board circuit diagram (1)

Figure 6. Teridian 71M6533-DB Evaluation Board Circuit Diagram (2)

Figure 7. Teridian 71M6533-DB Evaluation Board Circuit Diagram (3)

Teridian 71M6533-DB Evaluation Board Bill of Materials (BOM):


Figure 8. Teridian 71M6533-DB Evaluation Board Component Layout (Top Layer)

Figure 9. Teridian 71M6533-DB Evaluation Board Component Layout (Bottom Layer)
For details, see:
http://datasheets.maxim-ic.com/en/ds/71M6533-71M6534H.pdf
and
http://pdfserv.maxim-ic.com/en/an/UG5478.pdf