Maxim Integrated 78M6610+LMU User Manual
78M6610+LMU Evaluation Kit
User Manual
July 2013
Rev. 1
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patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.
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© 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
Table of Contents
1 Introduction ......................................................................................................................................... 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
2 USB Driver Installation ....................................................................................................................... 6
2.1.1 Confirm COM Port Mapping ............................................................................................. 6
2.1.2 FTDI COM Port Trouble Shooting .................................................................................... 6
3 Hardware 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
4 Hardware Setup: Digital Interface .................................................................................................... 11
4.1 USB Interface ........................................................................................................................... 11
4.2 RS-485 Interface ...................................................................................................................... 12
5 Graphical 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
6 Hardware Design Information .......................................................................................................... 24
6.1 Board Schematics .................................................................................................................... 24
6.2 Bill of Materials ......................................................................................................................... 28
6.3 PCB Layout .............................................................................................................................. 30
7 Contact Information .......................................................................................................................... 32
Revision History ........................................................................................................................................ 32
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78M6610+LMU Evaluation Kit User Manual
Figures
Figure 1: 78M6610+LMU Evaluation Board Con nections ..................................................................................... 7
Figure 2: 78M6610+LMU Evaluation Board Con nections ..................................................................................... 9
Figure 2: 78M6610+LMU Evaluation Board Con nections ................................................................................... 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 P CB Bottom View .......................................................................... 31
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78M6610+LMU Evaluation Kit User Manual
PART
TYPE
78M6610+LMUEVK1#
Evaluation Kit
Windows and Windows XP are registered trademarks of Microsoft Corp.
1 Introduction
The 78M6610+LMU evaluation kit (EV kit) demonstrates the capability of the 78M6610+LMU for monitoring a
single-phase or split-phas e 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
#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®
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78M6610+LMU Evaluation Kit User Manual
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 nonisolated 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 A C el ectrical
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.
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78M6610+LMU Evaluation Kit User Manual
Two sequential COM
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 d river 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. I f 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 ap pl i ed 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 othe r operating sy stem s, refer t o 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 US B S eri al 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
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
for access to the Device Manager. If a Ball Point device exists, delete it and unplug and replug the EV Kit’s
USB cable.
ports are associated
with the kit. Use the
second COM port
Port numbers may
differ on each PC.
Section 2.1.
Section 2.1.1
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78M6610+LMU Evaluation Kit User Manual
Connect
USB port
to PC
Line
Neutral
Load
AC source
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
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.
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78M6610+LMU Evaluation Kit User Manual
J24 Pins
Description
Jumper
Voltage
Current
VA
S0 0 IA
S1 0 VB
IB
VC
Pre-Amp
1X S1
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
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_GAI N register.
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78M6610+LMU Evaluation Kit User Manual
Connect
USB port
to PC
CT1
CT2
Line 1 Load
Line 2 Load
N
L1
N
L2
Line 1
Neutral
Line 2
+
+
AC source
3.2 Single/Multiphase Measurements Using CTs
In this diagram, the on-board relays are also wired in series to demonstrate load control.
Figure 2: 78M6610+LMU Evaluation Board Connections
1. Connect the AC source Neutral to J1 5 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).
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78M6610+LMU Evaluation Kit User Manual
J23 Pins
Description
Jumper
J9 Pins
Description
Jumper
Voltage
Current
VA
S0 IA
S1 0 VB 0 S2
IB 0 S3
VC
S0
-S2
Pre-Amp
1X S1
1X S3
3.2.1 Jumper Position Changes
Move J23 and J24 jumpers to position CT to use CT2 for sensor slot S1.
J23 Jumper Description
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
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.
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.
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