Maxim78M6618PDU1 Low Cost Power Distribution Solution

Maxim’s 78M6618 is a highly integrated IC that independently monitors the energy of eight single-phase AC outlets. It integrates multiple host interfaces, LCD drivers and configurable I/O ports. The 78M6618 provides ten interfaces for interfacing with voltage and current sensors. Analog input, and has 21-bit delta-sigma ADC, independent 32-bit calculation engine (CE), digital temperature compensation and precision voltage reference, can provide better than 0.5% accuracy in 2000:1 dynamic range, very Suitable for embedded high precision AC power and energy measurement. This article introduces the 78M6618 main features, block diagram, and 78M6618 low cost power distribution unit (PDU) evaluation board main features, circuit diagram and bill of materials and 78M6618 PDU-CT evaluation board circuit diagram with bill of materials:

The Teridian 78M6618 is a highly integrated IC for independent monitoring and measurement of up to eight single-phase AC outlets. With multiple host interface options, an integrated LCD driver, and configurable I/Os, the device is ideal for metered power distribution units ( PDUs) and rack enclosures for the data center, as well as intelligent power strips and subpanels in the grid-friendly digital home. At the measurement interface, the device provides 10 analog inputs for interfacing to voltage and current sensors. Scaled voltages from the sensors are fed to our Single Converter Technology® that uses a 21-bit delta-sigma ADC, independent 32-bit compute engine (CE), digital temperature compensation, and precision voltage references to provide better than 0.5% accuracy over a wide 2000:1 dynamic range. The integrated MPU core and 128KB of flash memory provides a flexible means of configuration, postprocessing, data formatting, interfacing to host processor through a UART or SPI™ interfa Alternatively, displaying output data to an LCD, or using DIO pins for intelligent relay control. Complete firmware for common applications is available from Teridian and can be loaded into the IC during manufacturing test., a complete array of ICE, development tools, and programming libraries are available to allow customization MPU code for each application.

78M6618 main features:

< 0.5% Wh Accuracy Over Wide 2000:1 Current Range and Over Temperature

Exceeds IEC 62053/ANSI C12.20 Standards 

Voltage Reference < 40ppm/℃ 

10 Sensor Inputs—V3P3 Referenced 

21-Bit Delta-Sigma ADC with Independent 32-Bit Compute Engine (CE) 

8-Bit MPU (80515), One Clock Cycle per Instruction with 4KB MPU XRAM 

128KB Flash with Security 

Integrated ICE for MPU Debug 

32kHz Time Base with Hardware Watchdog Timer 

UART and High-Speed ​​Slave SPI Host Interface Options 

Up to 19 General-Purpose 5V Tolerant I/O Pins 

LCD Driver (Up to 70 Pixels) 

Packaged in a Lead(Pb)-Free/RoHS-Compliant (6/6) 68-Pin QFN 

Robust Sub-Metering Application Firmware:

o True RMS Calculations for Current, Voltage, Line Frequency, Real Power, Reactive Power, Apparent Power, and Power Factor

o Accumulated Watt-Hours, Kilowatt-Hours, and Cost

o Intelligent Switch Control at Zero Crossings

o Digital Temperature Compensation

o Phase Compensation (+/-15degree)

o Quick Calibration Routines

o 46-64Hz Line Frequency Range with Same Calibration

o Programmable Alarm Thresholds

o High-Level UART Communication Protocols

o High-Level SPI Communication Protocols
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 1.78M6618 functional block diagram
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 2.78M6618 AFE block diagram

78M6618 Low-Cost Power Distribution Unit (PDU) Evaluation Board

The Teridian™ 78M6618 PDU1 evaluation board is an example of a low-cost power distribution unit (PDU) utilizing the 78M6618 system-on-chip (SoC). The 78M6618 monitors the AC line voltage and eight load currents, and controls switching of eight internal load relays. The embedded firmware calculates the RMS line voltage and RMS load currents, watts, VAs, VARs, and power factor. The real-time data is transmitted to a PC via a USB interface for Display in a Windows®-based graphical user interface (GUI). The 78M6618 UART interface is used as the communications link to an on-board isolated USB interface IC.

Included with the 78M6618 PDU1 is a Windows-based GUI for simplified access to the following measurement data and controls:

• RMS voltage and current

• Real, apparent, and reactive power and power factor

• Accumulated energy usage and expense tracking

• Line frequency

• Minimum and peak parameter tracking

• Alarm indicators

• Programmable alarm thresholds

• Internal load relay (16A) control
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 3. 78M6618 PDU1 Evaluation Board Outline Drawing

The 78M6618 PDU1 evaluation board includes:

The 78M6618 PDU1 evaluation kit includes:

• 78M6618 PDU1_DIFF evaluation board

• Universal AC to 12 V DC power supply with international plug adapters

• ICE Adaptor board

• USB A/B cable
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 4.78M6618 PDU1 evaluation board circuit diagram (1)
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 5.78M6618 PDU1 evaluation board circuit diagram (2)
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 6.78M6618 PDU1 evaluation board circuit diagram (3)
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 7.78M6618 PDU1 evaluation board circuit diagram (4)
78M6618 PDU1 Evaluation Board Bill of Materials:
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 8. 78M6618 PDU1 Evaluation Board PCB Layout: Top, Top; Bottom, Bottom
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 9. 78M6618 PDU-CT Evaluation Board Outline Drawing
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 10.78M6618 PDU-CT evaluation board circuit diagram (1)
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 11.78M6618 PDU-CT evaluation board circuit diagram (2)
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 12.78M6618 PDU-CT evaluation board circuit diagram (3)
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Figure 13.78M6618 PDU-CT evaluation board circuit diagram (4)
78M6618 PDU-CT Evaluation Board Bill of Materials:
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Maxim78M6618PDU1 Low Cost Power Distribution Solution
Maxim78M6618PDU1 Low Cost Power Distribution Solution

Figure 14. 78M6618 PDU-CT Evaluation Board PCB Layout: Top, Top; Bottom, Bottom
For details, see:
http://datasheets.maxim-ic.com/en/ds/78M6618.pdf
and
http://pdfserv.maxim-ic.com/en/an/UG5220.pdf

The Links:   SKM145GB174DN G190EAN010 6MBI25J-120