Teridian 71M6521 User manual

71M6521 Demo Board User’s Manual
Revision 2.18 © 2005-2009 TERIDIAN Semiconductor Corporation Page: 1 of 111
71M6521 Demo Board
USER’S MANUAL
4/16/2009 5:15:00 PM
Revision 2.18
TERIDIAN Semiconductor Corporation
6440 Oak Canyon Rd., Suite 100
Irvine, CA 92618-5201
Phone: [phone] ▪ Fax: [phone]
http://www.teridian.com/
meter.suppor[email protected]m

71M6521 Demo Board User’s Manual
Page: 2 of 111 © 2005-2009 TERIDIAN Semiconductor Corporation Revision 2.18
TERIDIAN Semiconductor Corporation makes no warranty for the use of its products, other than expressly contained in the
Company’s warranty detailed in the TERIDIAN Semiconductor Corporation standard Terms and Conditions. The company assumes
no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed
herein at any time without notice and does not make any commitment to update the information contained herein.

71M6521 Demo Board User’s Manual
Revision 2.18 © 2005-2009 TERIDIAN Semiconductor Corporation Page: 3 of 111
71M6521
Single-Phase Energy Meter IC
DEMO BOARD
USER’S MANUAL

71M6521 Demo Board User’s Manual
Page: 4 of 111 © 2005-2009 TERIDIAN Semiconductor Corporation Revision 2.18
Table of Contents
1Getting Started ..................................................................................................................................................9
1.1 General...............................................................................................................................................................9
1.2 Safety and ESD Notes.......................................................................................................................................9
1.3 Demo Kit Contents............................................................................................................................................9
1.4 Compatibility ...................................................................................................................................................10
1.5 Suggested Equipment not Included..............................................................................................................10
1.6 Demo Board Test Setup..................................................................................................................................10
1.6.1 Power Supply Setup...................................................................................................................................12
1.6.2 Cable for Serial Connection .......................................................................................................................13
1.6.3 Checking Operation ...................................................................................................................................13
1.6.4 Serial Connection Setup for the PC ...........................................................................................................14
1.7 Using the Demo Board....................................................................................................................................15
1.7.1 Communication Options.............................................................................................................................15
1.7.2Cycling the LCD Display ............................................................................................................................16
1.7.3 Serial Command Line Interface (CLI).........................................................................................................17
1.7.4 Communicating via Intel Hex Records .......................................................................................................22
1.7.5 Using the Battery Modes............................................................................................................................26
1.8 Using the Demo Board for Metering Functions............................................................................................28
1.8.1 Using the Demo Board in CT Mode ...........................................................................................................28
1.8.2 Adjusting the kh Factor for the Demo Board ..............................................................................................28
1.8.3 Adjusting the Demo Boards to Different Current Transformers and Voltage Dividers................................29
1.8.4 Connecting Demo Boards to a Shunt Resistor...........................................................................................30
1.8.5 Connecting Demo Board Revisions D6521T4A7, D6521T4A8, and D6521T4A10 to a Shunt Resistor.....31
1.8.6 Adapting Demo Code Parameters to Operation with Shunt Resistor.........................................................32
1.9 Calibration Parameters...................................................................................................................................32
1.9.1 General Calibration Procedure...................................................................................................................32
1.9.2 Updating the 6521_demo.hex file...............................................................................................................33
1.9.3 Calibration Macro File................................................................................................................................33
1.9.4 Updating Calibration Data in EEPROM......................................................................................................34
1.9.5 Loading the 6521_demo.hex file into the Demo Board ..............................................................................34
1.9.6 The Programming Interface of the 71M6521..............................................................................................36
1.10 Demo Code ......................................................................................................................................................36
1.10.1 Demo Code Description.............................................................................................................................36
1.10.2 Demo Code Variations...............................................................................................................................37
1.10.3 Accessing LCD and Sleep Modes from Brownout Mode............................................................................37
1.10.4 Demo Code Memory Locations for the 71M6521DE/FE ............................................................................37
1.10.5 CE Code Memory Locations (71M6521DE/FE) .........................................................................................44
1.10.6 CE Code Memory Locations (71M6521BE) ...............................................................................................45
1.10.7 Some MPU Code Memory Locations (71M6521BE)..................................................................................47
1.11 Emulator Operation.........................................................................................................................................48
2APPLICATION INFORMATION........................................................................................................................49
2.1 Calibration Theory...........................................................................................................................................49
2.1.1 Calibration with Three Measurements........................................................................................................49
2.1.2 Calibration with Five Measurements ..........................................................................................................51
2.1.3 Fast Calibration..........................................................................................................................................52
2.2 Calibration Procedures...................................................................................................................................53
2.2.1 General Precautions ..................................................................................................................................53
2.2.2 Calibration Procedure with Three Measurements......................................................................................54
2.2.3 Calibration Procedure with Five Measurements.........................................................................................54
2.2.4 Procedure for Fast Calibration ...................................................................................................................55
2.2.5 Calibration Spreadsheets...........................................................................................................................55

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2.2.6 Compensating for Non-Linearities..............................................................................................................57
2.2.7 Calibrating Meters with Combined CT and Shunt Resistor ........................................................................58
2.3 Schematic Information....................................................................................................................................61
2.3.1 Components for the V1 Pin........................................................................................................................61
2.3.2 Oscillator....................................................................................................................................................61
2.3.3 EEPROM ...................................................................................................................................................62
2.3.4 Connecting Three-Wire EEPROMs............................................................................................................62
2.3.5 LCD............................................................................................................................................................62
2.3.6 Optical Interface.........................................................................................................................................63
2.3.7 RESET and PB Switches...........................................................................................................................64
2.3.8 Operation with batteries .............................................................................................................................65
2.4 Testing the Demo Board.................................................................................................................................66
2.4.1 Functional Meter Test ................................................................................................................................66
2.4.2 EEPROM ...................................................................................................................................................67
2.4.3 RTC............................................................................................................................................................68
2.4.4 Hardware Watchdog Timer ........................................................................................................................68
2.4.5 LCD............................................................................................................................................................68
2.4.6 Supply Current Measurements...................................................................................................................69
2.5 TERIDIAN Application Notes..........................................................................................................................69
3Hardware Description .....................................................................................................................................71
3.1 D6521T4A7 Demo Board Description: Jumpers, Headers, Switches, Test Points, Connectors ..............71
3.2 Demo Board Hardware Specifications ..........................................................................................................74
3.3 CHanges to the D6521T4A7............................................................................................................................75
3.3.1 Increased ESD Protection..........................................................................................................................75
3.3.2 Improved Accuracy at Low Currents..........................................................................................................75
3.3.3 Access to the ICE_E Signal .......................................................................................................................75
3.3.4 Default Configuration for Resistive Current Shunt......................................................................................75
3.4 D6521T4A10: Features....................................................................................................................................76
3.4.1 D6521T4A10 Feature Summary ................................................................................................................76
3.4.2 D6521T4A10 Features for the India Market...............................................................................................77
3.4.3 D6521T4A10 Board Description.................................................................................................................77
4Appendix..........................................................................................................................................................78
4.1 64-Pin Demo Board Electrical Schematic (D6521T4A7)...............................................................................79
4.2 64-Pin Demo Board Electrical Schematic (D6521T4A8)...............................................................................81
4.3 64-Pin Demo Board Electrical Schematic (D6521T4A10).............................................................................83
4.4 D6521T4A7 Demo Board Bill of Material.......................................................................................................86
4.5 D6521T4A8 Demo Board Bill of Material.......................................................................................................87
4.6 D6521T4A10 Demo Board Bill of Material .....................................................................................................88
4.7 D6521T4A7 Demo Board PCB Layout ...........................................................................................................89
4.8 D6521T4A8 Demo Board PCB Layout ...........................................................................................................93
4.9 D6521T4A10 Demo Board PCB Layout .........................................................................................................97
4.10 Debug Board Bill of Material........................................................................................................................101
4.11 Debug Board Schematics.............................................................................................................................102
4.12 Debug Board PCB Layout ............................................................................................................................103
4.13 TERIDIAN 71M6521 Pin-Out Information.....................................................................................................106
4.14 Modification History......................................................................................................................................111

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List of Figures
Figure 1-1: Demo Board: Basic Connections...............................................................................................................10
Figure 1-2: Demo Board: Ribbon Cable Connections..................................................................................................11
Figure 1-3: The TERIDIAN 6521 Demo Board with Debug Board Block Diagram (CT Configuration).........................12
Figure 1-4: Port Configuration Setup.......................................................................................................................14
Figure 1-5: Hyperterminal Sample Window with Disconnect Button ....................................................................15
Figure 1-6: 71M6521BE CE/MPU Register Interpreter.............................................................................................26
Figure 1-7: Pre-Wired Shunt Resistor ......................................................................................................................30
Figure 1-8: Load Line with Shunt Resistor..............................................................................................................30
Figure 1-9: Shunt Connection for D6521T4A7, D6521T4A8, and D6521T4A10..........................................................31
Figure 1-10: Typical Calibration Macro file..............................................................................................................33
Figure 1-11: Emulator Window Showing Reset and Erase Buttons .............................................................................35
Figure 1-12: Emulator Window Showing Erased Flash Memory and File Load Menu .................................................35
Figure 2-1: Watt Meter with Gain and Phase Errors. ..................................................................................................49
Figure 2-2: Phase Angle Definitions.............................................................................................................................54
Figure 2-3: Calibration Spreadsheet for Three Measurements....................................................................................56
Figure 2-4: Calibration Spreadsheet for Five Measurements.......................................................................................56
Figure 2-5: Calibration Spreadsheet for Fast Calibration.............................................................................................57
Figure 2-6: Non-Linearity Caused by Quantification Noise ..........................................................................................57
Figure 2-7: 71M6521 with Shunt and CT ..................................................................................................................59
Figure 2-8: Voltage Divider for V1................................................................................................................................61
Figure 2-9: Oscillator Circuit.........................................................................................................................................61
Figure 2-10: EEPROM Circuit......................................................................................................................................62
Figure 2-11: Three-Wire EEPROM Circuit...................................................................................................................62
Figure 2-12: LCD Connections.....................................................................................................................................63
Figure 2-13: Optical Interface Block Diagram ..............................................................................................................63
Figure 2-14: Optical Port Circuitry on the Demo Board................................................................................................64
Figure 2-15: RESET pin, disabled................................................................................................................................64
Figure 2-16: RESET Switch Supplied by VBAT...........................................................................................................65
Figure 2-17: RESET Switch with Multiple Supplies......................................................................................................65
Figure 2-18: Meter with Calibration System.................................................................................................................66
Figure 2-19: Calibration System Screen ......................................................................................................................67
Figure 3-1: 71M6521T4A7 Demo Board Connectors, Jumpers, Switches, and Test Points........................................73
Figure 3-2: Top (Left) and Bottom Copper (Right) Structures at Current Inputs...........................................................75
Figure 3-3: D6521T4A10 Demo Board ........................................................................................................................76
Figure 3-4: D6521T4A10 Demo Board with ICE Adapter.............................................................................................76
Figure 3-5: D6521T4A10 Demo Board ........................................................................................................................77
Figure 4-1: D6521T4A7 Demo Board: Electrical Schematic 1/2 ..................................................................................79
Figure 4-2: D6521T4A7 Demo Board: Electrical Schematic 2/2 ..................................................................................80
Figure 4-3: D6521T4A8 Demo Board: Electrical Schematic 1/2 ..................................................................................81
Figure 4-4: D6521T4A8 Demo Board: Electrical Schematic 2/2 ..................................................................................82
Figure 4-5: D6521T4A10 Demo Board: Electrical Schematic 1/3 ................................................................................83
Figure 4-6: D6521T4A10 Demo Board: Electrical Schematic 2/3 ................................................................................84
Figure 4-7: D6521T4A10 Demo Board: Electrical Schematic 3/3 ................................................................................85
Figure 4-8: D6521T4A7 Demo Board: Top View..........................................................................................................89
Figure 4-9: D6521T4A7 Demo Board: Top Copper......................................................................................................90
Figure 4-10: D6521T4A7 Demo Board: Bottom View ..................................................................................................91
Figure 4-11: D6521T4A7 Demo Board: Bottom Copper ..............................................................................................92
Figure 4-12: D6521T4A8 Demo Board: Top View........................................................................................................93
Figure 4-13: D6521T4A8 Demo Board: Top Copper....................................................................................................94
Figure 4-14: D6521T4A8 Demo Board: Bottom View ..................................................................................................95
Figure 4-15: D6521T4A8 Demo Board: Bottom Copper ..............................................................................................96
Figure 4-16: D6521T4A10 Demo Board: Top View......................................................................................................97

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Figure 4-17: D6521T4A10 Demo Board: Top Copper..................................................................................................98
Figure 4-18: D6521T4A10 Demo Board: Bottom Copper ............................................................................................99
Figure 4-19: D6521T4A10 Demo Board: Bottom View ..............................................................................................100
Figure 4-20: Debug Board: Electrical Schematic .......................................................................................................102
Figure 4-21: Debug Board: Top View.........................................................................................................................103
Figure 4-22: Debug Board: Bottom View ...................................................................................................................103
Figure 4-23: Debug Board: Top Signal Layer........................................................................................................104
Figure 4-24: Debug Board: Middle Layer 1, Ground Plane...................................................................................104
Figure 4-25: Debug Board: Middle Layer 2, Supply Plane....................................................................................105
Figure 4-26: Debug Board: Bottom Trace Layer ...................................................................................................105
Figure 4-27: TERIDIAN 71M6521 QFN68: Pinout (top view).....................................................................................108
Figure 4-28: TERIDIAN 71M6521 LQFP64: Pinout (top view)...................................................................................109
List of Tables
Table 1-1: Jumper settings on Debug Board................................................................................................................13
Table 1-2: Straight Cable Connections ........................................................................................................................13
Table 1-3: Null-Modem Cable Connections .................................................................................................................13
Table 1-4: COM Port Setup Parameters......................................................................................................................14
Table 1-5: Summary of Communication Options .........................................................................................................15
Table 1-6: Selectable Display Options.........................................................................................................................16
Table 1-7: Fields of a Hex Record ...............................................................................................................................23
Table 1-8: Data (Command) Types..............................................................................................................................24
Table 1-9: Hex Record Examples ................................................................................................................................24
Table 1-10: Pre-Assembled Hex Records....................................................................................................................25
Table 1-11: CE RAM Locations for Calibration Constants ...........................................................................................33
Table 1-12: Flash Programming Interface Signals.......................................................................................................36
Table 1-13: MPU memory locations (71M6521DE/FE)................................................................................................41
Table 1-14: Values for Pulse Source Registers ...........................................................................................................42
Table 1-15: STATUS Register .....................................................................................................................................43
Table 1-16: CE Memory Locations (71M6521FE, 71M6521DE)..................................................................................45
Table 1-17: CE memory locations (71M6521BE).........................................................................................................46
Table 1-18: CESTATE Register.....................................................................................................................................46
Table 1-19: Some MPU Memory Locations .................................................................................................................47
Table 2-1: Calibration Summary ..................................................................................................................................60
Table 3-1: D6521N12A7 Demo Board Description...................................................................................................72
Table 4-4: D652T4A7 Demo Board: Bill of Material.....................................................................................................86
Table 4-2: D652T4A8 Demo Board: Bill of Material.....................................................................................................87
Table 4-3: D652T4A10 Demo Board: Bill of Material ...................................................................................................88
Table 4-4: Debug Board: Bill of material................................................................................................................101
Table 4-5: 71M6521 Pin Description 1/2....................................................................................................................106
Table 4-6: 71M6521 Pin Description 2/2....................................................................................................................107

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71M6521 Demo Board User’s Manual
Revision 2.18 © 2005-2009 TERIDIAN Semiconductor Corporation Page: 9 of 111
1 GETTING STARTED
1.1 GENERAL
The TERIDIAN Semiconductor Corporation (TSC) 71M6521 Demo Board is an energy meter IC
demonstration board for evaluating the 71M6521 device for single-phase electronic energy metering
applications. It incorporates a 71M6521 integrated circuit, 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 RS232 port. The Demo Board allows the evaluation of the 71M6521 energy meter controller
chip for measurement accuracy and overall system use.
The board is pre-programmed with a Demo Program (file name 6521_demo.hex) in the FLASH memory of
the 71M6521 IC. This embedded application is developed to exercise all low-level functions to directly
manage the peripherals and CPU (clock, timing, power savings, etc.).
1.2 SAFETY AND ESD NOTES
Connecting live voltages to the Demo Board system will result in potentially hazardous voltages on the
Demo Board.
EXTREME CAUTION SHOULD BE TAKEN WHEN HANDLING THE DEMO BOARD
ONCE IT IS CONNECTED TO LIVE VOLTAGES!
THE DEMO SYSTEM IS ESD SENSITIVE! ESD PRECAUTIONS SHOULD BE
TAKEN WHEN HANDLING THE DEMO BOARD!
1.3 DEMO KIT CONTENTS
71M6521 Demo Board containing 71M6521FE IC with preloaded Demo Program
Shunt resistor with harness, connected to Demo Board
Debug Board
Two 5VDC/1,000mA universal wall transformers w/ 2.5mm plug (Switchcraft 712A)
Serial cable, DB9, Male/Female, 2m length (Digi-Key AE1020-ND)
CD-ROM containing documentation (data sheet, board schematics, BOM, layout), Demo Code, and
utilities
Adapter PCB (ICE connector to 6X1 header, D6521T4A10 only)
Connector adapter for 5 VDC supply (D6521T4A10 only, optional)
1

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1.4 COMPATIBILITY
This manual applies to the following hardware and software revisions:
71M6521FE, chip revision A06
71M6521 chip memory configurations 71M6521BE (8KB), 71M6521DE (16KB), 71M6521FE (32KB)
Demo D6521T4A7 (64-pin, REV 7.0), D6521T4A8 (64-pin, REV 8.0), and D6521T4A10 (64-pin, REV
10.0) Demo Kit firmware revision 4.7 and later
1.5 SUGGESTED EQUIPMENT NOT INCLUDED
For functional demonstration:
PC w/ MS-Windowsversions XP, ME, or 2000, equipped with RS232 port (COM port) via DB9
connector
For software development (MPU code):
Signum ICE (In Circuit Emulator): ADM-51
http://www.signum.com
Keil 8051 “C” Compiler kit: CA51
http://www.keil.com/c51/ca51kit.htm, http://www.keil.com/product/sales.htm
1.6 DEMO BOARD TEST SETUP
Figure 1-1 shows the basic connections of the Demo Boards plus Debug Boards with the external
equipment.
Figure 1-1: Demo Board: Basic Connections
The Debug Board can be plugged into J2 of the Demo Board. One spacer of the Debug Board should be
removed, as shown in Figure 1-1. Alternatively, both boards can be connected using a flat ribbon cable, as
shown in Figure 1-2. A male header has to be soldered to J3 of the Debug Board, and the female-to-female
flat ribbon cable is not
Power
Host PC
Debug
Board Demo
Board
Spacer
removed
supplied with the Demo Kit (use Digi-Key P/N A3AKA-1606M-ND or similar).

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Figure 1-2: Demo Board: Ribbon Cable Connections
The 71M6521 Demo Board block diagram is shown in Figure 1-3. It consists of a stand-alone meter Demo
Board and an optional Debug Board. The Demo Board contains all circuits necessary for operation as a
meter, including display, calibration LED, and power supply. The Debug Board, when not sharing a power
supply with the meter, is optically isolated from the meter and interfaces to a PC through a 9 pin serial port.
Connections to the external signals to be measured, i.e. scaled AC voltages and current signals derived from
shunt resistors or current transformers, are provided on the rear side of the Demo Board.
It is recommended to set up the Demo Board with no live AC voltage connected, and to
connect live AC voltages only after the user is familiar with the demo system.
Power
Ribbon Cable
Debug Board
Demo
Board
Power
Host PC

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Figure 1-3: The TERIDIAN 6521 Demo Board with Debug Board Block Diagram (CT Configuration)
All analog input signals are referenced to the V3P3 (3.3V power supply to the chip).
1.6.1 POWER SUPPLY SETUP
There are several choices for meter power supply:
•Internal (using the AC line voltage). The internal power supply is only suitable when the line voltage
exceeds 220V RMS.
•External 5VDC connector (J1) on the Demo Board
•External 5VDC connector (J1) on the Debug Board.
The power supply jumper, JP1, must be consistent with the power supply choice. JP1 connects the AC
line voltage to the internal power supply. This jumper should usually be left in place.
An adapter may have to be used for the transition between the supplied 5 VDC power supply and the 5-
VDC connector on the D6521T4A10 version of the Demo Board.
DEMONSTRATION METER
IA
NEUTRAL
IA
V3P3
VA
3.3V
VA
GND
V3P3
GND
JP1
5V DC
EEPROM
V3P3
V3P3
ICE Connector
OPTO
OPTO
OPTO
OPTO
OPTO
Wh
VARh
TX
RX
5V DC
V5_DBG
GND_DBG
V5_DBG
V5_DBG
RS-232
INTERFACE
DB9
to PC
COM Port
GND_DBG
V5_DBG
OPTO
OPTO
FPGA
11/27/2006
V5_NI
CE HEARTBEAT (1Hz)
MPU HEARTBEAT (5Hz)
DEBUG BOARD (OPTIONAL)
6521
Single Chip
Meter
TMUXOUT
CKTEST
5VLCDDISPLAY
DIO6
DIO7
DIO4
DIO5
RTMINTERFACE
LOAD A
IB
LOAD B
VB
IB
JP21
External Current
Transformers
J2
GND
N/C
N/C
4
15, 16
13, 14
6
6
8
12
10
V3P3D
N/C
3
1
2
5,7,
9, 11
DB9
to PC
COM Port
On-board
components
powered by V3P3D

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1.6.2 CABLE FOR SERIAL CONNECTION
For connection of the DB9 serial port to a PC, either a straight or a so-called “null-modem” cable may be
used. JP1 and JP2 are plugged in for the straight cable, and JP3/JP4 are empty. The jumper configuration is
reversed for the null-modem cable, as shown in Table 1-3.
Cable
Configuration Mode Jumpers on Debug Board
JP1 JP2 JP3 JP4
Straight Cable Default Installed Installed -- --
Null-Modem Cable Alternative -- -- Installed Installed
Table 1-1: Jumper settings on Debug Board
JP1 through JP4 can also be used to alter the connection when the PC is not configured as a DCE device.
Table 1-2 shows the connections necessary for the straight DB9 cable and the pin definitions.
PC Pin Function Demo Board Pin
2 TX 2
3 RX 3
5 Signal Ground 5
Table 1-2: Straight Cable Connections
Table 1-3 shows the connections necessary for the null-modem DB9 cable and the pin definitions.
PC Pin Function Demo Board Pin
2 TX 3
3 RX 2
5 Signal Ground 5
Table 1-3: Null-Modem Cable Connections
1.6.3 CHECKING OPERATION
A few seconds after power up, the LCD display on the Demo Board should briefly display the following
welcome text:
H
E
L
L
0
After the welcome text, the Demo Board should display the following information:
3.
0.
0
0
1
The number 3 in the leftmost digit indicates that accumulated Watt-hours are displayed. In the case shown
above, 0.001 Wh were accumulated. The decimal dot in the leftmost segment will be blinking, indicating
activity of the MPU inside the 71M6521.
In Mission Mode, the display can be cycled by pressing the pushbutton (PB).
If no information is stored in the EEPROM, Demo Boards with the 71M6521DE or 71M6521BE will
only display the HELLO message and then wait for the user to transfer the CE default data via
HyperTerminal.
Demo Board revisions D6521T4A8 and later require the shunt resistor to be connected for
proper operation. See section 1.8.5 for details.

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1.6.4 SERIAL CONNECTION SETUP FOR THE PC
After connecting the DB9 serial port to a PC, start the HyperTerminal application (or any other suitable
communication program) and create a session using the communication parameters shown in Table 1-4.
Setup Parameter 71M6521FE (32KB)
Default
71M6521DE (16KB) 71M6521BE (8KB)
Use only with Demo Codes for
71M6521BE/DE
Port speed (baud) 9600/3009600/3009600/300
Data bits 8 8 8
Parity none None None
Stop bits 1 1 1
Flow control XON/XOFF XON/XOFF XON/XOFF
depending on the jumper setting at JP12
Table 1-4: COM Port Setup Parameters
HyperTerminal can be found by selecting Programs Accessories Communications from the Windows
start menu. The connection parameters are configured by selecting File Properties and then by pressing
the Configure button (see Figure 1-4).
A setup file (file name “Demo Board Connection.ht”) for HyperTerminal that can be loaded with File Open
is also provided with the tools and utilities on the supplied CD-ROM.
Figure 1-4: Port Configuration Setup
Note: Port parameters can only be adjusted when the connection is not active. The disconnect button, as
shown in Figure 1-5 must be clicked in order to disconnect the port.

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Figure 1-5: Hyperterminal Sample Window with Disconnect Button
1.7 USING THE DEMO BOARD
The 71M6521 Demo Board is a ready-to-use meter prepared for use with an external current transformer.
Using the Demo Board involves communicating with the Demo Code. An interactive command line interface
(CLI) is available as part of the Demo Code (71M6521FE). The CLI allows all sorts of manipulations to the
metering parameters, access to the EEPROM, initiation of auto-calibration sequences, selection of the
displayed parameters, changing calibration factors and many more operations.
1.7.1 COMMUNICATION OPTIONS
Before evaluating the 71M6521 Demo Board, users should get familiar with the commands and responses of
the CLI. A complete description of the CLI is provided in section 1.7.2.
The Demo Codes for the 16KB and 8KB flash versions (71M6521BE and 71M6521DE) can be controlled via
a protocol that involves Intel Hex Records. This protocol is described in section 1.7.4.
A summary of the communication options is shown in Table 1-5.
71M6521BE 71M6521DE 71M6521FE
Flash size [KB] 8 16 32
Communication Hex records Hex records Command line interface
Description in
section 1.7.2 1.7.2 1.7.1
File transfer on
power-up Not necessary CE defaults Not necessary
Table 1-5: Summary of Communication Options

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1.7.2 CYCLING THE LCD DISPLAY
The Demo Codes for all versions of the 71M6521 Demo Board allow cycling of the display using the PB
button. By briefly pressing the button, the next available parameter from Table 1-6 is selected. This makes it
easy to navigate various displays for Demo Boards that do not have the CLI.
Step Display in
left-most
digit(s)
Displayed Parameter Available
for
71M6521BE
Available
for
71M6521DE
Available
for
71M6521FE
1
1
Temperature difference from calibration
temperature. Displayed in 0.1°C X X X
2
2
Frequency at the VA_IN input [Hz] X X X
3
3
Accumulated real energy [Wh]. The default
display setting after power-up or reset. X X X
4
9
Time of day (hh.mm.ss) X X X
5
--
Date (yyyy.mm.dd) X X X
6
1.3
Count of zero crossings in the last
accumulation interval X X X
7
1.5
RMS current at phase A input [A] X X X
8
1.6
RMS voltage at the VA_IN input [V] X X X
Table 1-6: Selectable Display Options

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1.7.3 SERIAL COMMAND LINE INTERFACE (CLI)
Once, communication to the Demo Board is established, press <CR> and the Demo Program prompt (“>”)
should appear. Type >i1 to verify that the Demo Program version is revision 4.7 or later.
Users should familiarize themselves with the Demo Program commands described in the tables below. Due
to limited memory space, there is no help menu.
The Demo Program (Demo Code) is compiled with EEPROM specified as the non-volatile memory. This
means that the default calibration factors are stored in flash memory whereas the calibration factors resulting
from an actual calibration are stored in EEPROM.
The tables below describe the commands in detail.
Commands for CE Data Access:
] CE DATA ACCESS
Description: Allows user to read from and write to CE data space.
Usage: ] [Starting CE Data Address] [option]…[option]
Command
combinations: ]??? Read consecutive 16-bit words in Decimal
]$$$ Read consecutive 16-bit words in Hex
]U Update default version of CE Data in EEPROM.
Important: The CE must be stopped (CE0)
before issuing this command!
Example: ]40$$$ Reads CE data words 0x40, 0x41 and 0x42.
]7E=12345678=9876ABCD Writes two words starting @ 0x7E
CE data space is the address range for the CE DRAM (0x1000 to 0x13FF). All CE data words are
in 4-byte (32-bit) format. The offset of 0x1000 does not have to be entered when using the ]
command, thus typing ]A? will access the 32-bit word located at the byte address 0x1000 + 4 * A
= 0x1028.
Commands for MPU/XDATA Access:
) MPU DATA ACCESS
Description: Allows user to read from and write to MPU data space.
Usage: ) [Starting MPU Data Address] [option]…[option]
Command
combinations: )??? Read three consecutive 32-bit words in Decimal
)$$$ Read three consecutive 32-bit words in Hex
)a=n=m Write the values n and m to two consecutive
addresses starting at a
Example: )08$$$$ Reads data words 0x08, 0x0C, 0x10, 0x14
)04=12345678=9876ABCD Writes two words starting @ 0x04
MPU or XDATA space is the address range for the MPU XRAM (0x0000 to 0x07FF). All MPU data words
are in 4-byte (32-bit) format. Typing ]A? will access the 32-bit word located at the byte address 4 *
A = 0x28. The energy accumulation registers of the Demo Code can be accessed by typing two
Dollar signs (“$$”), typing question marks will display negative decimal values if the most
significant bit is set.

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Commands for DIO RAM (Configuration RAM) and SFR Control:
R DIO AND SFR CONTROL
Description: Allows the user to read from and write to DIO RAM and special function registers (SFRs).
Usage: R [option] [register] … [option]
Command
combinations: RIx… Select I/O RAM location x (0x2000 offset is automati- cally added)
Rx… Select internal SFR at address x
Rx???... Read consecutive SFR registers in decimal
Rx$$$... Read consecutive registers in hex notation
Example: RI60$$$$ Read all four RTM probe registers
DIO or Configuration RAM space is the address range 0x2000 to 0x20FF. This RAM contains
registers used for configuring basic hardware and functional properties of the 71M6521 and is
organized in bytes (8 bits). The 0x2000 offset is automatically added when the command RI is
typed. The SFRs (special function registers) are located in internal RAM of the 80515 core,
starting at address 0x80.
Commands for EEPROM Control:
EE EEPROM CONTROL
Description: Allows user to enable read and write to EEPROM.
Usage: EE [option] [arguments]
Command
combinations: EECn EEPROM Access (1 Enable, 0 Disable)
EERa.b Read EEPROM at address 'a' for 'b' bytes.
EEE Erase the EEPROM
EESabc..xyz Write characters to buffer (sets Write length)
EETa Transmit buffer to EEPROM at address 'a'.
EEWa.b...z Write values to buffer
Example: EEShello; EET$0210 Writes 'hello' starting at EEPROM address 0x210.
The EEC1 command must be issued before the EEPROM interface can be used. The execution of the EEE
command takes several seconds. During this time, no other commands can be entered.
Auxiliary Commands:
AUXILIARY
Description: Various
Commands: , Typing a comma (“,”) repeats the command issued
from the previous command line. This is very helpful
when examining the value at a certain address over
time, such as the CE DRAM address for the
temperature.
/ The slash (“/”) is useful to separate comments from
commands when sending macro text files via the serial
interface. All characters in a line after the slash are
ignored.
BT Commands execution of a battery test.

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Commands controlling the CE:
C COMPUTE ENGINE
CONTROL
Description: Allows the user to enable and configure the compute engine.
Usage: C [option] [argument]
Command
combinations: CEn Compute Engine Enable (1 Enable, 0 Disable)
CTn Select input n for TMUX output pin. Enter n in hex
notation.
CREn RTM output control (1 Enable, 0 Disable)
CRSa.b.c.d Selects CE addresses for RTM output (maximum of
four)
Example: CE0 Disables the CE
CT1E Selects the CE_BUSY signal for the TMUX output pin
Calibration Commands:
CL CALIBRATION CONTROL
Description: Calibration-related commands. A full auto-calibration can be implemented by compiling the
Demo Code with auto-calibration selected as an option. Due to space restrictions, the
auto-calibration is not implemented in the Demo Code supplied with the Demo Boards.
Usage: CL [option]
Command
combinations: CLC Switches the CLI to Intel hex format, e.g. for loading
calibration data via the serial port
CLD Restores calibration to defaults
CLR Restores calibration from EEPROM
CLS Saves calibration to EEPROM
Commands for Identification and Information:
I INFORMATION MESSAGES
Description: Allows user to display information messages.
Usage: I
Example: I Returns the Demo Code version
The I command is used to identify the revisions of Demo Code and the contained CE code.

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Commands for Controlling the Metering Values Shown on the LCD Display:
M METER DISPLAY
CONTROL (LCD)
Description: Allows user to select internal variables to be displayed.
Usage: M [option]. [option]
Command
combinations: M kWh Total Consumption (display wraps around at 999.999)
M1 Temperature (C° delta from nominal)
M2 Frequency (Hz)
M3. [phase] kWh Total Consumption (display wraps around at 999.999)
M4. [phase] kWh Total Inverse Consumption (display wraps around at
999.999)
M5. [phase] kVARh Total Consumption (display wraps around at 999.999)
M6. [phase] kVAh Total Inverse Consumption (display wraps around at
999.999)
M7. [phase] VAh Total (display wraps around at 999.999)
M9 Real Time Clock
M10 Calendar Date
M13. n Main edge count (n = 0: accumulated, n = 1: last second)
M17 Battery voltage. Display will return to M3 after a few seconds.
Example: M3.1 Displays Wh total consumption of phase A.
Displays for total consumption wrap around at 999.999kWh (or kVARh, kVAh) due to the
number of available display digits. Internal registers (counters) of the Demo Code are 64 bits
wide and do not wrap around.
The internal accumulators in the Demo Code use 64 bits and will neither overflow nor wrap
around under normal circumstances. The restriction to only six digits is due to the require-
ment to provide one digit showing the display mode that is separated by a blank digit from
the displayed values.
Commands for Controlling the RMS Values Shown on the LCD Display:
MR METER RMS DISPLAY
CONTROL (LCD)
Description: Allows user to select meter RMS display for voltage or current.
Usage: MR [option]. [option]
Command
combinations: MR1. [phase] Displays instantaneous RMS current
MR2. [phase] Displays instantaneous RMS voltage
Example: MR1.2 Displays phase b RMS current.