Maxim’s 71M6x01 (71M6541D/71M6541F/71M6541G/71M6542F/71M6542G) series is the fourth-generation single-phase meter SoC that integrates 5MHz 8051 compatible MPU core, low-power RTC with digital temperature compensation, flash memory and LCD driver, using a single Conversion technology, with 22-bit Delta-Sigma ADC, three or four analog outputs, digital temperature compensation, precise reference voltage and 32-bit calculation engine (CE), very few external components, and power meters that support various applications. Introduced the main features of 71M6x01, multiple block diagrams, and the main indicators of the DB6541 REV2.0 demo board,

DB6541 REV3.0 demo board circuit diagram, bill of materials and PCB layout diagram.

The 71M6541D/71M6541F/71M6541G/71M6542F/71M6542G are Teridian™ 4th-generation single-phase metering SoCs with a 5MHz 8051-compatible MPU core, low-power RTC with digital temperature compensation, flash memory, and LCD driver. Our Single Converter Technology ® with a 22-bit delta-sigma ADC, three or four 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 71M6541/2 devices support optional interfaces to the Teridian 71M6x01 series of isolated sensors, which offer BOM cost reduction, immunity to magnetic tamper, and enhanced reliability. Other features include an SPI interface, advanced power management, ultra-low-power operation in active and battery modes, 3/5KB shared RAM and 32/64/128KB of flash memory that can be programmed in the field with code and/or data during meter operation and the ability to drive up to six LCD segments per SEG driver pin. High processing and sampling rates combined with differential inputs offer a powerful metering platform for residential meters.

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

Main features of 71M6x01:

• 0.1% Accuracy Over 2000:1 Current Range

• Exceeds IEC 62053/ANSI C12.20 Standards

• Two Current Sensor Inputs with Selectable Differential Mode

• Selectable Gain of 1 or 8 for One Current Input to Support Shunts

• High-Speed ​​Wh/VARh Pulse Outputs with Programmable Width

• 32KB Flash, 3KB RAM (71M6541D)

• 64KB Flash, 5KB RAM (71M6541F/42F)

• 128KB Flash, 5KB RAM (71M6541G/42G)

• Up to Four Pulse Outputs with Pulse Count

• Four-Quadrant Metering

• Digital Temperature Compensation:

– Metrology Compensation

– Accurate RTC for TOU Functions with Automatic Temperature Compensation for Crystal in All Power Modes
• Independent 32-Bit Compute Engine

• 46-64Hz Line Frequency Range with the Same Calibration

• Phase Compensation (10)

• Three Battery-Backup Modes:

– Brownout Mode (BRN)

– LCD Mode (LCD)

– Sleep Mode (SLP)

• Wake-Up on Pin Events and Wake-On Timer

• 1μA in Sleep Mode

• Flash Security

• In-System Program Update

• 8-Bit MPU (80515), Up to 5 MIPS

• Full-Speed ​​MPU Clock in Brownout Mode

• LCD Driver:

– Up to 6 Commons/Up to 56 Pins

• 5V LCD Driver with DAC

• Up to 51 Multifunction DIO Pins

• Hardware Watchdog Timer (WDT)

• I2C/MICROWIRE® EEPROM Interface

• SPI Interface with Flash Program Capability

• Two UARTs for IR and AMR

• IR LED Driver with Modulation

• Industrial Temperature Range

• 64-Pin (71M6541D/F/G) and 100-pin (71M6542F/G) Lead(Pb)-Free LQFP Package

Figure 1. Block diagram of 71M6x01

Figure 2. Block diagram of 71M6541D/F/G with local sensor

Figure 3. Block diagram of 71M6541D/F/G with 71M6x01 insulation sensor

Figure 4. Block diagram of 71M6542F/G with local sensor

Figure 5. Block diagram of 71M6542F/G with 71M6x01 insulation sensor

DB6541 REV2.0 demo board

The Teridian semiconductor Corporation (TSC) DB6541 REV2.0 Demo Board is a demonstration board for evaluating the 71M6541F device for single-phase Electronic power metering applications in conjunction with the Remote Sensor Interface. It incorporates a 71M6541F integrated circuit, a 71M6101 Remote Interface IC , 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 RS-232 port. The Demo Board allows the evaluation of the 71M6541F energy meter chip for measurement accuracy and overall system use.

The board is pre-programmed with a Demo Program (Demo Code) in the FLASH memory of the 71M6541F IC. This embedded application is developed to exercise all low-level function calls to directly manage the pe-ripherals, flash programming, and CPU ( clock, timing, power savings, etc.).

The 71M6541F IC on the Demo Board is pre-programmed and pre-calibrated for the 50 μΩ or 120 μΩ shunt shipped with the board. The Demo Board may also be used for operation with a CT after hardware modifica-tions that can be easily performed by the user. This configuration will require a different version of the Demo Code.

Figure 6. Block diagram of DB6541 REV2.0 demo board

The DB6541 REV2.0 demo board includes:

• Demo Board DB6541 REV 3.0 containing one 71M6601 or 71M6201 Remote Sensor Interface and one 71M6541F IC with pre-loaded demo program

• 5VDC/1,000mA universal wall transformer with 2.5mm plug (Switchcraft 712A compatible)

• USB cable

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

• ANSI base with 50 μΩ shunt resistor (optional, for ANSI kits only) or two 120 μΩ shunt resistors

Figure 7. The basic connection diagram of DB6541 REV2.0 demo board and debug board

Hardware indicators of DB6541 REV2.0 demo board:


Figure 8. Block diagram of a single-phase three-wire meter with two parallel sensors

Figure 9. Block diagram of a single-phase two-wire meter with two parallel sensors

Figure 10. Block diagram of a single-phase two-wire meter with parallel sensors

Figure 11. DB6541 REV3.0 demo board circuit diagram (1)

Figure 12. The circuit diagram of the DB6541 REV3.0 demo board (2)

List of materials for DB6541 REV3.0 demo board:

Figure 13. The PCB layout of the DB6541 REV3.0 demo board
For details, see:
http://datasheets.maxim-ic.com/en/ds/71M6541D-71M6542G.pdf
and
http://datasheets.maxim-ic.com/en/ds/71M6541F-DB.pdf