Maxim Integrated 78M6610+LMU User manual

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit
patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
© 2013 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
78M6610+LMU Evaluation Kit
User Manual
July 2013
Rev. 1

78M6610+LMU Evaluation Kit User Manual
2 Rev 1
Table of Contents
1Introduction .........................................................................................................................................4
1.1 Ordering Information..................................................................................................................4
1.2 Package Contents......................................................................................................................4
1.3 System Requirements ...............................................................................................................4
1.4 Safety and ESD Notes...............................................................................................................5
1.5 Testing the 78M6610+LMU EV Board Prior to Shipping...........................................................5
2USB Driver Installation .......................................................................................................................6
2.1.1 Confirm COM Port Mapping.............................................................................................6
2.1.2 FTDI COM Port Trouble Shooting....................................................................................6
3Hardware Setup: Sensor Interface ....................................................................................................7
3.1 Single-Phase Measurements using Shunts...............................................................................7
3.1.1 Jumper and Switch Descriptions......................................................................................8
3.1.2 Device Configuration........................................................................................................8
3.2 Single/Multiphase Measurements Using CTs............................................................................9
3.2.1 Jumper Position Changes..............................................................................................10
3.2.2 Device Configuration......................................................................................................10
3.3 Pseudo-Isolated Single-Phase Measurements Using CTs......................................................21
3.3.1 Jumper Position Changes..............................................................................................23
3.3.2 Device Configuration......................................................................................................23
4Hardware Setup: Digital Interface....................................................................................................11
4.1 USB Interface...........................................................................................................................11
4.2 RS-485 Interface......................................................................................................................12
5Graphical User Interface (GUI).........................................................................................................13
5.1 GUI Initialization.......................................................................................................................13
5.1.1 SSI Tab..........................................................................................................................13
5.1.2 Device Tab.....................................................................................................................14
5.1.3 Direct Tab.......................................................................................................................14
5.1.4 Configuration Tab...........................................................................................................15
5.1.5 Command Register Tab.................................................................................................15
5.1.6 Calibration Tab...............................................................................................................16
5.1.7 Power Tab......................................................................................................................16
5.1.8 Energy Tab.....................................................................................................................17
5.1.9 Fundamental Tab...........................................................................................................17
5.1.10 Min/Max Tab.................................................................................................................17
5.1.11 Alarms Tab ...................................................................................................................18
5.1.12 Monitor Tab,..................................................................................................................19
6Hardware Design Information..........................................................................................................24
6.1 Board Schematics....................................................................................................................24
6.2 Bill of Materials.........................................................................................................................28
6.3 PCB Layout..............................................................................................................................30
7Contact Information..........................................................................................................................32
Revision History........................................................................................................................................32

78M6610+LMU Evaluation Kit User Manual
Rev 1 3
Figures
Figure 1: 78M6610+LMU Evaluation Board Connections.....................................................................................7
Figure 2: 78M6610+LMU Evaluation Board Connections.....................................................................................9
Figure 2: 78M6610+LMU Evaluation Board Connections...................................................................................22
Figure 3: 78M6610+LMU Evaluation Board Electrical Schematic (1 of 4)..........................................................24
Figure 4: 78M6610+LMU Evaluation Board Electrical Schematic (2 of 4)..........................................................25
Figure 5: 78M6610+LMU Evaluation Board Electrical Schematic (3 of 4)..........................................................26
Figure 6: 78M6610+LMU Evaluation Board Electrical Schematic (4 of 4)..........................................................27
Figure 7: 78M6610+LMU Evaluation Board PCB Top View ...............................................................................30
Figure 8: 78M6610+LMU Evaluation Board PCB Bottom View..........................................................................31

78M6610+LMU Evaluation Kit User Manual
4 Rev 1
1 Introduction
The 78M6610+LMU evaluation kit (EV kit) demonstrates the capability of the 78M6610+LMU for monitoring a
single-phase or split-phase AC load using up to two voltages and two currents (sensors included). The EV kit
connects to a PC through a USB cable that provides both power and data communication to the board. A
Windows®-based graphical user interface (GUI) communicates with the device over a virtual for simplified
access to measurement data and controls.
1.1 Ordering Information
PART
TYPE
78M6610+LMUEVK1#
Evaluation Kit
#Denotes a RoHS-compliant device that may include lead that is
exempt under the RoHS requirements.
1.2 Package Contents
The 78M6610+LMU EV kit includes the following:
•78M6610+LMU Evaluation Board
•Two 20A Current Transformers
•USB Cable Assembly USB A-B 28/24 1.8M (Tyco/Amp 1487588-3)
•CD with Documentation, GUI Application, and USB Drivers
•Calibration Coefficients Document (Hardcopy Only)
1.3 System Requirements
In addition to an AC source and load for measuring, the EV kit requires a Windows PC with the following
features:
•1GHz processor and 1GB RAM
•Minimum 1024 x 768 video display resolution
•Available USB port
•Microsoft Windows 7 or Windows XP®
Windows and Windows XP are registered trademarks of Microsoft Corp.

78M6610+LMU Evaluation Kit User Manual
Rev 1 5
1.4 Safety and ESD Notes
EXERCISE CAUTION WHEN LIVE AC VOLTAGES ARE PRESENT!
Do not connect test equipment or external development boards directly to the non-
isolated portion of the 78M6610 hardware. Damage to the 78M6610 and external
equipment will occur due to the 78M6610’s “high side” reference topology. The
78M6610’s V3P3 supply (i.e., “high side”) is connected directly to Neutral (Earth
Ground) creating a ground reference disparity with any properly grounded external
equipment.
The board components and firmware settings are designed to operate with the following nominal AC electrical
ranges: Voltage Current Line Frequency
10-300 VAC 10 mA – 20A 46-64 Hz
1.5 Testing the 78M6610+LMU EV Board Prior to Shipping
Before every kit is shipped, the board (and sensors) undergo a single-load point calibration using precise
energy source equipment. The device temperature is also calibrated at the same time. Results printed out on
paper and included with the EV kit.

78M6610+LMU Evaluation Kit User Manual
6 Rev 1
2 USB Driver Installation
This EV kit includes an isolated USB interface for serial communications with a PC. The FTDI USB controller
IC FT2232 performs the USB functions. The FTDI Windows driver presents a virtual COM port for enabling
serial communications. The FTDI Windows driver is a certified driver for Windows XP and Windows 7.
Upon attaching the 78M6610+LMU EV Board to the PC, the Found New Hardware Wizard automatically
launches and installs the appropriate driver files. If your PC does not find the FTDI driver files on its local hard
disk drive, locate and reference the FTDI USB Driver and Utilities subdirectory on the CD. The FT2232
controller and 78M6610+LMU is powered from the USB cable and is active when no AC power is applied to
the sensor interface of the 78M6610+LMU EV Kit.
Note:If an older FTDI driver has been previously installed, it is recommended to remove the older version
before installing this newer FTDI driver. Execute the ftdiClean.exe utility from the FTDI USB Driver and
Utilities subdirectory. For FTDI driver support on other operating systems, refer to the FTDI website at
www.ftdichip.com.
2.1.1 Confirm COM Port Mapping
•Launch the Control Panel and click on the System icon.
•The System Properties screen appears. Click on the Hardware tab. Click on Device Manager. Under
Ports (COM & LPT), look for the USB Serial Port assignment.
•Take note of the COM port assignment for the USB Serial Port.
2.1.2 FTDI COM Port Trouble Shooting
If the FTDI device driver did not install properly, there would be no assigned COM port number for the FTDI
controller. Repeat the USB Driver Installation, see Section 2.1.
Microsoft Windows may associate a Ball Point device to the FTDI USB controller. When this occurs a FTDI
device COM port assignment is available via HyperTerminal but there is no communications data. Verify if a
Ball Point device has been added to the “Human Interface Devices” via the Device manager. See Section 2.1.1
for access to the Device Manager. If a Ball Point device exists, delete it and unplug and replug the EV Kit’s
USB cable.
Two sequential COM
ports are associated
with the kit. Use the
second COM port
Port numbers may
differ on each PC.

78M6610+LMU Evaluation Kit User Manual
Rev 1 7
3 Hardware Setup: Sensor Interface
The 78M6610+LMU EV board can be provisioned in multiple configurations. This manual covers common
setups for using a shunt, shunt with CT, or two CTs. The board is provisioned and calibrated for the following
configuration to retrieve the gain value of the shunt (printed on a label located on the bottom of the board).
3.1 Simple 2-Wire Single-Phase Measurements Using Shunts
Connect
USB port
to PC
Line
Neutral
Load
AC source
Figure 1: 78M6610+LMU Evaluation Board Connections
1. Connect the AC source Neutral output to J15.
2. Connect J8 to Load’s Neutral input.
3. Connect the AC source Line 1 output to J2 and to Load’s Line 1 input.

78M6610+LMU Evaluation Kit User Manual
8 Rev 1
3.1.1 Jumper and Switch Descriptions
The following tables describe the default position of the EV board jumpers and switches for using the on-board
shunt current sensor at sensor slot S1.
J23 Jumper Description
J23 Pins Description Jumper
1/2 Connect J15 SHUNT to 78M6610+LMU Sensor Slot 1 Installed
2/3 Connect J10 CT2+ to 78M6610+LMU Sensor Slot 1 -
J24 Jumper Description
J24 Pins
Description
Jumper
1/2 Connects J8 SHUNT to 78M6610+LMU Sensor Slot 1 Installed
2/3 Connects J10 CT2- to 78M6610+LMU Sensor Slot 1 -
J9 Jumper Description
J9 Pins Description Jumper
1/2 Connect AC Neutral to V3P3A (chip reference) Installed
3.1.2 Device Configuration
Use the Configuration tab to map the sensors as shown in the table below. Re-enter the gain value, as
needed, for the shunt resistor into the S1_GAIN register.
Voltage
Current
VA
S0
0
IA
S1
0
VB
IB
VC
Pre-Amp
1X S1

78M6610+LMU Evaluation Kit User Manual
Rev 1 9
3.2 Single/Multiphase Measurements Using CTs
In this diagram, the on-board relays are also wired in series to demonstrate load control.
Connect
USB port
to PC
CT1
CT2
Line 1 Load Line 2 Load
N
L1
N
L2
Line 1
Neutral Line 2
+
+
AC source
Figure 2: 78M6610+LMU Evaluation Board Connections
1. Connect the AC source Neutral to J15 and the load(s).
2. Connect the AC source Line 1 to J2 and to J19 (Relay1) through the Line 1 CT.
3. Connect J20 (Relay1) to Line 1 load.
4. Connect Line 1 CT’s secondary to J14 (burden resistor).
5. Connect the AC source Line 2 to J4 and to J31 (Relay2) through the Line 2 CT.
6. Connect J30 (Relay1) to Line 1 load.
7. Connect Line 2 CT’s secondary to J10 (burden resistor).

78M6610+LMU Evaluation Kit User Manual
10 Rev 1
3.2.1 Jumper Position Changes
Move J23 and J24 jumpers to position CT to use CT2 for sensor slot S1.
J23 Jumper Description
J23 Pins
Description
Jumper
1/2 Connect J15 SHUNT to 78M6610+LMU Sensor Slot 1 -
2/3 Connect J10 CT2+ to 78M6610+LMU Sensor Slot 1 Installed
J24 Jumper Description
J24 Pins Description Jumper
1/2 Connects J8 SHUNT to 78M6610+LMU Sensor Slot 1 -
2/3 Connects J10 CT2- to 78M6610+LMU Sensor Slot 1 Installed
J9 Jumper Description
J9 Pins
Description
Jumper
1/2 Connect AC Neutral to V3P3A (chip reference) Installed
3.2.2 Device Configuration
Use the Configuration tab to map the sensors as shown in the table below. Re-enter the gain value as needed
for CT2 into the S1_GAIN register.
Voltage
Current
VA
S0
IA
S1
0
VB
0
S2
IB
0
S3
VC
S0
-S2
Pre-Amp
1X S1
1X S3
Note: The values for VC will not be displayed correctly on the Power tab of the provided GUI due to the
increased full-scale value of VC. Reported results for measurements derived from VC will be one-half the
expected magnitude.

78M6610+LMU Evaluation Kit User Manual
Rev 1 11
4 Hardware Setup: Digital Interface
4.1 Isolated USB Interface
Switch Description
Description
Default
SW4 Sets host interface mode upon reset IFC0 Open
IFC1 Closed
SW5 Sets device address upon reset (UART/I
2
C modes) Both Closed
J12 Jumper Description
J12 Pins
Description
Default
1/2 Connect 78M6610+LMU to USB Controller (U3) Installed
2/3 Connect 78M6610+LMU to RS485 transceiver (U11) -
J17 Jumper Description
J17 Pins Description Default
1/2 Connect USB Controller to isolation IC (U7) Installed
2/3 Connect RS485 transceiver to isolation IC (U7) -
J18 Jumper Description
J18 Pins
Description
Default
1/2 Connect USB Controller to isolation IC (U7) Installed
2/3 Connect RS485 transceiver to isolation IC (U7) -
J24A, J24B Jumper Description
J24A/B Pins
Description
Default
1/1 Connects MP0 to LED4 Installed
2/2 SDO/TXD/SDAo -
3/3 SDI/RXD/SDAi -
4/4 SPCK/ADDR0 -
5/5 Connects MP4 to LED5 Installed
6/6 SSB/DIR/SCL -
7/7 Connects MP6/ADDR1 connection to LED2 Installed
8/8 Connects MP7 connection to LED8 Installed
9/9 IFC0 -
10/10 Connects MP10 connection to LED6 Installed
11/11 IFC1 -

78M6610+LMU Evaluation Kit User Manual
12 Rev 1
J27 Jumper Description
J27 Pins
Description
Default
1/2 Enable on-board RS485 termination resistor -
J28 Jumper Description
J28 Pins
Description
Default
1/2 Connect USB Controller to isolation IC (U7) Installed
J29 Jumper Description
J29 Pins
Description
Default
1/2 Connect USB Controller to isolation IC (U7) Installed
J38 Jumper Description
J38 Pins
Description
Default
1/2
Enable on-board RS485 termination resistor
-
4.2 Isolated RS-485 Interface
The board also includes an isolated RS-485 interface as an alternative to the USB interface. The
78M6610+LMU serial UART is connected to the RS-485 transceiver. Refer to the IC data sheet for details on
the serial protocol.
Move J12, J17, and J18 jumpers from position 1-2 to position 2-3 to connect the RS-485 transceiver
instead of the USB controller.
The USB cable provides power to the EV board when connected to the PC. If the USB cable not being used
+5VDC power must be provided at J16, pins 1 and 6 (+5V and ground, respectively). Do not supply power to
JJ16, pin1 AND connect the USB cable to the PC.
J22 RS-485 Connector Pin Assignment
J22 Pin Number
Pin Name
Pin Description
1 +5VDC Connect to external source
2 Data - P Tri-state, Bi-directional
3 Data - N Tri-state, Bi-directional
4 GND Connect to external source
4.3 Isolated UART, I2C, SPI Interfaces
The native host interfaces of the 78M6610+LMU are made available on the isolated side of the barrier at J16.

78M6610+LMU Evaluation Kit User Manual
Rev 1 13
5 Graphical User Interface (GUI)
A graphical user interface (GUI) is included on the 78M6610+LMU EV kit CD to facilitate quick evaluation of
the 78M6610+LMU energy measurement device. The GUI requires Microsoft.NET Framework 4 on the PC for
which the GUI is to execute on. Upon invoking the GUI executable file, an installation wizard may appear if
Microsoft.NET Framework 4 is not installed on the PC. Follow the installation wizard instructions, or download
Microsoft.NET Framework 4 from the Microsoft website prior to launching the GUI.
5.1 GUI Initialization
The GUI is self-explanatory when used with the 78M6610+LMU Data Sheet. The user, however, should note
the following about the EV kit hardware:
•Serial COM Port:
Following the installation instructions in Section 2, launch the GUI executable. Click the
Connection pull-down menu and select Connect.
The COM Port / Baud Rate box appears. Select the COM port assigned to the EV kit and
leave the baud rate set to 38400 (default). Click the Connect button.
5.1.1 SSI Tab
•SSI ID: Click the SSI tab. Use the SSI ID number set by DIP switch 5 (1 and 2 are closed by default)
and click Set Target. Upon successful communication with the EV kit, a message appears in
the message box.

78M6610+LMU Evaluation Kit User Manual
14 Rev 1
5.1.2 Device Tab
The Device tab shows to current firmware build as well as the temperature and line frequency being
measured.
5.1.3 Direct Tab
The Direct tab allows read and write access to all the byte-addressable registers documented in the data
sheet. The data can be displayed with the scale factor and units applied for convenience. In the example
below, the voltage register is being read, so the volts option is used to display the data.

78M6610+LMU Evaluation Kit User Manual
Rev 1 15
5.1.4 Configuration Tab
The Configuration tab is used to set up the sensor interface. Once this is done it can be saved to NVRAM for
future use, or programmed to a user-defined configuration and saved. See the Calibration tab for saving the
settings.
5.1.5 Command Register Tab
The Command Register tab is a read/write control tab for manual operation of the command register (0x00).
Hex and decimal formats are supported.

78M6610+LMU Evaluation Kit User Manual
16 Rev 1
5.1.6 Calibration Tab
The Calibration tab is used to configure and execute calibration commands. The calibration targets can be
viewed and changed and the scaling parameters are also displayed for convenience.
The calibration and NVRAM are also saved using the provided button.
5.1.7 Power Tab
The Power tab displays the current power being consumed by the loads. P (active power), Q (reactive power),
and S (apparent power) are displayed along with the voltage, current, crest factor, and power factor are also
displayed.

78M6610+LMU Evaluation Kit User Manual
Rev 1 17
5.1.8 Energy Tab
The Energy tab displays the accumulated power both into and out of the load. The pull-down menu is used to
select the channel that is being displayed; A, B, or C, and update is used to update the displayed data
5.1.9 Fundamental Tab
The Fundamental tab is used to display the fundamental and harmonic measurements for voltage, current,
and power. The harmonics displayed can be selected with the get/set harmonic buttons.
5.1.10 Min/Max Tab
The Min/Max tab is used to display the minimum and maximum measurements for the parameters selected in
the Word Addr column. The units can be selected with the provided pull-down menu and the most recent
measurements are updated using the get buttons. All the measurements are reset with the reset button.

78M6610+LMU Evaluation Kit User Manual
18 Rev 1
5.1.11 Alarms Tab
The Alarms tab is a user-definable display of whatever parameters are required in a particular application. The
alarms are described in detail in Sections 2.11 and 2.12 of the 78M6610+LMU Data Sheet.

78M6610+LMU Evaluation Kit User Manual
Rev 1 19
5.1.12 Monitor Tab
The Monitor tab is a running record of all the communications between the GUI and the target
78M6610+LMU. A log file can be generated to save the transactions for later analysis.

78M6610+LMU Evaluation Kit User Manual
20 Rev 1
6 Alternate Sensor Configurations
6.1 Split-Phase Using Shunt (On Neutral) and One CT (On Line)
In this configuration, neutral is measured instead of Line 2. Results for Line 2 are indirectly calculated from the
measurements on Line 1 and Neutral.
Connect
USB port
to PC
AC source
Line 1
Neutral
Line 2
Load
Line 1
CT
+
1. Connect the AC source Neutral output to J15.
2. Connect J8 to Load’s Neutral input.
3. Connect the AC source Line 1 output to J2 and to Load’s Line 1 input.
4. Feed Line 1 through the CT.
5. Connect Line 1 CT’s secondary to J14 (burden resistor).
6. Connect the AC source Line 2 output to J4 and the Load’s Line 2 input.