TI Designs
Three Phase Rogowski Coil Based E-Meter Solution
TI Designs
Design Features
TI Designs provide the foundation that you need
including methodology, testing and design files to
quickly evaluate and customize the system. TI Designs
help you accelerate your time to market.
The board can be configured to:
• 3-phase 0.2% energy metering solution
• Software di/dt integration and energy
calculation library provides for easy code
development
• Software integrator solution – minimal
hardware changes to migrate from existing
C- based solutions
• No effect of DC components of current
• Current sensing immune to EMI
• No phase shift in current measurement
Design Resources
TIDM-3PHMETERROGOWSKI
MSP430F67791A
TPS54060
Tool Folder Containing Design Files
Product Folder
Product Folder
ASK Our E2E Experts
WEBENCH® Calculator Tools
Featured Applications
The applications are as follows:
• E-meter with Rogowski coil current sensors
• Utility metering
• Power quality meters
• Grid infrastructure meters
An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and other
important disclaimers and information.
All trademarks are the property of their respective owners.
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
1
System Description
1
www.ti.com
System Description
This design, featuring the MSP430F67791A microcontroller, implements a highly integrated single chip
electricity metering solution with support for Rogowski Coil current sensors. Hardware and software design
files are provided to enable calculation of various parameters for multi-phase energy measurement such
as RMS current and voltage, active and reactive power and energies, power factor, and frequency. The
added hardware and software support for Rogowski coils make it easy to interface with Rogowski coils
with minimal hardware changes when migrating from traditional current transformers. The Rogowski coil
current sense library implements an efficient software integration of the Rogowski output, enabling this to
be a single chip solution for three-phase e-metering. The software package also includes a dummy
application for quick and easy evaluation of the hardware and software.
2
Design Features
This design is modelled after the EVM430-F6779 metering EVM, and has the same feature set as that
board, except for the current measurement front-end, which has been modified to support Rogowski coils.
Keeping a similar design as the CT based EVM enables easy migration from CT based solutions to a
Rogowski coil based current measurement solution. The software library has been developed to perform
integration of the Rogowski coil output and calculate active, reactive and apparent powers, along with
frequency and optionally, RMS voltage and current. The library functions are easily accessible through an
API, making it easy to develop host applications to run the library and run auxiliary functions like display,
communications and calibration. A dummy application is also packaged with the software, featuring a
UART based interface to interact with the meter. The RS232 port on the meter can be connected to a PC
and the user can log the metering data, and read and write each phase's calibration data to the flash
memory using any serial port monitor (such as HyperTerminal).
3
Block Diagram
Figure 1 shows the basic block diagram of the EVM. The phase voltages are fed to the microcontroller’s
Sigma-Delta ADC inputs after passing through a resistor divider. The di/dt output of the Rogowski coils are
passed through passive anti-aliasing filters before feeding into the controller’s sigma delta inputs. No
analog integration or gain stage is needed for the Rogowski coil outputs, since the software takes care of
integration, and each of the controller’s sigma delta blocks features a built in programmable gain amplifier
with a gain of up to 128.
The built in LCD controller of the MCU is used to interface with a 160 segment LCD for displaying the
metering results, and an isolated RS-232 interface is used to communicate with a PC using the dummy
application.
2
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
TIDU474 – September 2014
Submit Documentation Feedback
Circuit Design and Component Selection
www.ti.com
Figure 1. Block Diagram of Rogowski Coil EVM
4
Circuit Design and Component Selection
4.1
Power Supply
Power supply to the board can either be provided by the MSP430 FET programmer during debugging, or
using the switching power supply module on board. The switching power supply provides a single output
voltage of 3.3 V directly from the ac mains at 100 V to 230 V RMS. In the configuration shown, the meter
is powered as long as there is AC voltage on Phase C, corresponding to pad LINE 3 on the hardware and
P3+1 on the schematic. The internal circuitry of a switching power supply is omitted from this application
report. For the drive of the power supply, refer to the documentation of the power supply module.
4.2
Analog Inputs
The MSP430 analog front end, which consists of the ΣΔ ADC, is differential and requires that the input
voltages at the pins do not exceed ±930 mV (gain = 1). To meet this specification, the current and voltage
inputs must be divided down. In addition, the ΣΔ24 allows a maximum negative voltage of -1 V. Therefore,
AC signals from mains can be directly interfaced without the need for level shifters. This section describes
the analog front end used for voltage and di/dt channels.
4.2.1
Voltage Inputs
The voltage from the mains is usually 230 V or 120 V and must be brought down to a range of 930 mV.
The analog front end for voltage consists of spike protection varistors followed by a simple voltage divider
and a RC low-pass filter that acts like an anti-alias filter. Figure 2 shows the voltage divider and anti-alias
circuit implemented on the board.
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
3
Software Description
www.ti.com
P1+1
R7
R14
330k
330k
1k
R15
R1
V1
R6
330k
S20K275
EXCML20A
R5
V1+
2.37K
LINE1 L1
LINE1
C1
C8
47p
15n
AGND
R32
AGND
NEUTRAL
V1-
1k
C9
AGND
47p
AGND
Figure 2. Voltage Input Circuit
4.2.2
4.2.2 di/dt Input
The di/dt inputs from the Rogowski coils must be passed through a passive 2-pole RC filter in order to
reject any high frequencies that may cause aliasing in the ADC, especially since the coils have a very high
bandwidth. di/dt Input Front End illustrates the passive anti-alias filter used in the design. A TVS diode is
provided at the input in order to prevent the input to the sigma delta from going beyond the specified
limits.
R21
CUR1-
R28
C19
4.3k
I1+
C20
47n
47n
C18
C7
1n
R22
12k
12k
CUR1-
R26
I1-
4.3k
R23
47n
4.3k
R27
47n
C76
CUR1+
SMAJ5.0CA
CUR1+
TVS2
I1+
AGND
I1-
4.3k
di/dt Input Front End
5
Software Description
This section describes the Softdidt Rogowski Coil metering library and the dummy application used to test
and calibrate the EVM. The software is developed in the IAR Embedded Workbench for MSP430
microcontrollers.
The software for the three-phase metrology using Rogowski coils is discussed in this section. The
application programmer’s interface (API) functions are described together with their function parameters
and their return values. The software itself is supplied as a library, which exposes a clearly defined API
with C prototyped function entry points, and which can be linked against application code, making
software development easy. The following functionality is accessible using these API calls:
• Configuration for run time adapting the library (calibration constants to include gain, phase, and zero
offset trim, other run time options such as choice of test pulse output)
• Event capture for easy application interfacing (low line voltage, over current, reverse current)
• Signal processing chain hooks for advanced users (intermediate calculation values)
4
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
TIDU474 – September 2014
Submit Documentation Feedback
Software Description
www.ti.com
5.1
High-Level Architecture of the Software
Software Signal Flow describes the basic signal flow through the software. Voltage samples acquired by
the SD24 are passing through two high-pass filters before being corrected for the signal path delay.
Current samples pass through a single high-pass filter for DC-removal before being integrated and passed
on through an additional high-pass filter, which compensates for the cancellation of the pole of the first
high-pass filter in the integrator. After that, the filtered voltage and current samples are used to calculate
the active and reactive energy. They also can be accessed by the API calls. For the calculation of the
reactive energy, the voltage samples are shifted by 90° before being multiplied with the current samples.
For both paths, the calibration values for offset and gain are applied and the results are finally scaled to
the units published in the API documentation below.
Energy Accumulation (x3 phases)
Period
vsumsquare(t)
v(t)
SD16
2
S
F
1
2
S
F
9
4
NCYCLES
vfiltered(t)
3
VARh
±VAROFFSET
VARGAIN
I/SCALE
±TRIMDELAY
di/dt
SD16
Key
5
ò
S
2
S
isumsquare(t)
NCYCLES
6
Wh
9
7
±WOFFSET
WGAIN
I/SCALE
ifiltered(t)
Zero Crossing Detect (xl phase)
RMS Option
API Support
Analogue
4 ksps rate
Ö
sumsquare(t)
4 ksps/N
Line Frequency
VARGAIN
I/SCALE
vfiltered(t)
8
period
ifiltered(t)
vfiltered(t)
®Fn()
rms(t)
Software Signal Flow
5.2
Energy Meter Software
This section details the contents of the package and the available API calls. Note that only minor
adjustments for the sensor are necessary and that all other functions can be used as-is.
5.2.1
Contents of the Library Package
The package for the library contains the following files:
• The file softdidt.h in the directory Library\include. This is the file containing the export definitions for the
API functions and their return codes and the setup definitions for the phases. The contents will be
detailed later in this guide.
• The file Library.r43 in the directory Library\Release. This is the Rogowski-coil software library against
which the application code needs to be linked.
• An example project in the directory Dummyapp is detailed later in this document.
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
5
Software Description
5.2.2
www.ti.com
API Functions
5.2.2.1
Initialization Functions
The following list the initialization functions.
DiDtInitLibrary()
Prototype
Parameters
Return Value
Description
Comments
DiDtInitHardware()
Prototype
Parameters
Return Value
Description
Comments
DiDtInitSensors()
Prototype
Parameters
Return Value
Description
Comments
DiDtInitAccumulators()
Prototype
Parameters
Return Value
Description
Comments
5.2.2.2
uint16_t DiDtInitLibrary(void)
None
uint16_t version - library version number in the form 0xHHLL
Performs any required software initialization of the library.
0xHH is the major version number and 0xLL is the minor version number;
changes to the major version number represent incompatible feature set
changes.
status_t DiDtInitHardware(const sensor_routing_t *adcchannels)
sensor_routing_t * adcchannels - filled with the mapping between ADC
channel and sensor input, one for each phase
status_t result – result code
Informs the library of the hardware set up.
The library expects that the processor clock is already running at its high rate,
and this function call will configure the ADC channels and one timer needed to
run.
status_t DiDtInitSensors(const sensor_setups_t *sensors)
sensor_ setups_t * sensors - array of setup structures, one for each phase
status_t result – result code
Sets up any sensor to sensor variations for the attached Rogowski coils.
None
status_t DiDtInitAccumulators(const sensor_accumulators_t *sensors)
sensor_accumulators_t * sensors - accumulator structure to update
status_t result – result code
Initialise the accumulator set
This function is required to set the continuation point for the accumulators
after a power cycle, for example having retrieved them from non-volatile
memory.
Obtaining Running Results
The following functions are used to obtain running results.
6
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
TIDU474 – September 2014
Submit Documentation Feedback
Software Description
www.ti.com
DiDtReadSnapshot()
Prototype
Parameters
Return Value
Description
Comments
DiDTReadAccumulator
s()
Prototype
Parameters
Return Value
Description
Comments
5.2.2.3
status_t DiDtReadSnapshot(sensor_results_t *sensors)
sensor_results_t * sensors - result structure to update
status_t result – result code
Collects the last second snapshot of the sensor readings.
Calling this function at a rate faster than the accumulation period will merely
return the last snapshot multiple times. Callers can check if the data has been
updated since the last poll by inspecting the sequence number, which is
incremented once per accumulation period.
status_t DiDtReadAccumulators(sensor_accumulators_t *sensors)
sensor_accumulators_t * sensors - accumulator structure to update
status_t result – result code
Reads the current accumulator set.
Calling this function at a rate faster than the accumulation period has no
effect, the accumulators are read only.
Runtime Changes
The following functions are for runtime changes.
DiDtAdjustTestPulse()
Prototype
Parameters
Return Value
Description
Comments
5.2.2.4
status_t DiDtAdjustTestPulse(const test_pulse_t *setting)
Test_pulse_t setting - pointer to test pulse settings
status_t result – result code
Updates the test pulse settings
A setting change also clears out the internal pulse accumulator since it would
be in the wrong scale; this is therefore also the case at startup when calling
this function for the first time.
Registering Callout Functions
The following functions are for registering callout functions.
DiDtRegisterMetrology
Callout()
Prototype
Parameters
Return Value
Description
Comments
TIDU474 – September 2014
Submit Documentation Feedback
status_t DiDtRegisterMetrologyCallout(metrocallout_t function, void *param)
status_t DiDtRegisterMetrologyCallout(metrocallout_t function, void *param)
void * param - An opaque parameter to pass to the function when it is called
status_t result – result code
Registers a single function with the library that will be called when a metrology
event occurs
None
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
7
Software Description
www.ti.com
DiDtRegisterSampleCal
lout()
Prototype
status_t DiDtRegisterSampleCallout(samplecallout_t function, void *param)
Parameters
samplecallout_t function - Function to register, or NULL to deregister void *
param - An opaque parameter to pass to the function when it is called
Return Value
status_t result – result code
Description
Registers a single function with the library that will be called when raw sample
data is available for each phase.
Comments
None
5.2.3
Data Types
The following data types are used in addition to those in <stdint.h> per ISO9899:1999.
Table 1. Data Types
5.2.4
Data Type
Description
bool_t
A boolean taking the values TRUE (!FALSE) or FALSE (0) only
status_t
An alias of uint16_t for returning success or error codes
adcchannel_t
An alias of uint16_t for specifying an ADC channel number
adcgain_t
An alias of uint16_t for specifying the ADC gain value
metro_reason_t
An alias of type uint16_t containing reason codes which may be passed to callout
functions to inform the application code that some interesting event has occurred within
the metrology. The codes are detailed in Section 4.2.5.
metrocallout_t
A function pointer called when the library has interesting events to report, called with a
subreason code indicating the event of interest, and the opaque handle that was
supplied when the function pointer was registered
samplecallout_t
A function pointer called when the library has interesting events to report, called with
the filtered voltage and current sample, and the opaque handle that was supplied when
the function pointer was registered
phasemask_t
A bitmap of active phases when passing multiple structures around
Data Structures
The data structures used in the library and the API functions can be found in the header file softdidt.h. In
this header file, the scaling of the different results is also explained. The two main structures used
throughout the software, sensor_results_t and sensor_accumulators_t, contain the measurement results
that are detailed in Section 5.2.4.1 and Section 5.2.4.2. The structures used during calibration of the
system are outlined in their respective sections.
5.2.4.1
sensor_results_t
Table 2 describe the fields in sensor_results_t.
Table 2. Fields in sensor_results_t
8
Variable
Type
Scaling
Remark
Vrms
Uint16_t
V*2-7
RMS Voltage
Irms
Uint16_t
V*2-8
RMS Current
wh
Uint16_t
Wh/s*2-8
Active Energy
varh
Uint16_t
VARh/s*2-8
R
watts
Uint16_t
W
Instantanous Active Power
line_frequency
Uint16_t
Hz*2-10
Frequency
wh_forward
Uint8_t
-
Direction of Wh (Fwd=1)
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
TIDU474 – September 2014
Submit Documentation Feedback
Meter Demo
www.ti.com
Table 2. Fields in sensor_results_t (continued)
5.2.4.2
Variable
Type
Scaling
Remark
varh_forward
Uint8_t
-
Direction of VARh (Fwd=1)
sequence
Uint8_t
-
Free running sequence number
sensor_accumulators_t
This structure contains the current results for each phase in a sub-structure “phases” of the type
sensor_accumulator_t and the phasemask defining the phase(s) used.
Table 3. Fields in sensor_accumulators_t
5.2.5
Variable
Type
Scaling
Remark
net_wh
int64_t
Wh *2-8
Net Wh (active)
net_varh
int64_t
VARh *2-8
Net VARh (reactive)
Callout Reasons
The following reason codes may be passed to the callout functions to inform the application code that
some interesting event has occurred within the metrology.
Table 4. Metrology Callout Reasons
Definition
Description
SUBREASON_VOLTAGE_SAG
Voltage sag in progress
SUBREASON_OVER_CURRENT
Gross over-current detected
SUBREASON_REVERSE_CURRENT
Reverse current detected
SUBREASON_SUSPECT_FREQUENCY
Suspect mains frequency
SUBREASON_ACCURACY_LOST
Calculation accuracy error detected.
NOTE: The library manages the intermediate accuracy
internally; therefore, this code is not currently used.
SUBREASON_NEW_SNAPSHOT
New summation results are available
6
Meter Demo
6.1
EVM Overview
6.1.1
Loading the Example Code
Opening the Project
The source code is developed in the IAR™ IDE using IAR compiler version 6.x. The project files cannot
be opened in earlier versions of IAR. If the project is loaded in a version later than 6.x, a prompt to create
a backup is displayed, and you can click YES to proceed. For the first time it is recommended to
completely rebuild the project.
Open IAR Embedded Workbench, find and load the project Dummyapp.ewp, and rebuild all. (Refer to
Rebuilding the Project).
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
9
Meter Demo
www.ti.com
Rebuilding the Project
Load the project onto the EVM by clicking “Debug and Download” from the Project drop down menu. This
will launch the application.
Calibrating Over Rs232
Calibration is best performed using a meter test station and test pulse, but a rough calibration can be
performed using a known current and voltage source via the serial terminal. Connect to the display PCB
via the isolated serial port using 9600bps 8N1 and no handshaking. The description here describes a zero
offset calibration of just one phase, but in a production situation all three phases could be zero offset
calibrated in parallel, with the addition of more complex software.
To start calibration:
Select the phase to operate on, here, using phase A
phase=0
and read back the active settings using read
If the flash memory has been erased the values will all be 0xFFFF, a sensible initial set of values to start
with would be to enter the following assignments:
wh_gain=16384
wh_offset=0
varh_gain=16384
varh_offset=0
delay=0
creep_threshold=0
write
Zero Offset
Apply a known current of 15A and 240V and 0, this is convenient because it is 3600W per phase (which in
internal units corresponds to 256 × 2-8Wh/s). The actual current should merely be selected to be well
away from zero.
Turn logging on and observe the output values over a couple of seconds. Sum the values for each phase
and divide by 256, this coarse correction should then be applied to the default of 16384 set earlier. For
example
log=1
A, +230, -2, 3234
B, +260, +1, 3656
C, +255, -3, 3585
A, +233, -2, 3235
B, +260, +1, 3656
C, +256, -3, 3600
wh_gain=18118
10
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
TIDU474 – September 2014
Submit Documentation Feedback
Test Results and Calibration
www.ti.com
Rebuilding the Project (continued)
calculated as (16384 × 2 × 256) / (230 + 233) = 18118
Apply zero current to the meter and accumulate energy over a reasonable period of time, in this example
30 seconds is selected
zero offset=30
the meter will calculate the correction factor and update the local RAM copy.
Delay trim
Set the test load to 15A and 240V and 60, adjust the delay register in the range 0-255 to achieve an
output of 128 × 2-8Wh/s.
Gain trim
Apply a known current of 15A and 240V and 0, check the gain having set the phase and zero offset.
Having applied the new calibration values, the results can be committed to flash using the write command.
In the event of a mistake, the modified values can be discarded by either selecting another phase with the
‘phase’ command or reading back the stored settings with ‘read’.
7
Test Results and Calibration
Metrology Results
The metrology results obtained by using a metrology test setup are shown in Error (%) vs. Input Current
(A), at 230V, 50Hz. The meter was tested from 0.05A to 100A (Dynamic range of 2000:1) at 230V, and 0⁰,
+60⁰ and -60⁰ current. The test pulse generated by the meter was fed into the test setup which compared
the test pulse frequency against the actual power to generate the error percentage.
Error (%) vs. Input Current (A), at 230V, 50Hz
8
Design Files
This section provides the schematics and layout images used for this design.
8.1
Schematics
The schematics are presented in the following order:
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
11
Design Files
10
C38
100nF
0.47uF
Watch Crystal
DVCC
MSP430F67791
L
1
100
100
R54
100
R55
100
R56
R52
100K
R49
100K
R50
BTN3
1
1
2
BTN1
E
2
100K
2
BTN2
BTN4
DGND
DGND
DGND
F
1 JP10
2
3
JTAG
DVCC
DVCC
G
1
2
3
4
C53
Jumper Config
12 - SBW
23 - JTAG
DVCC / DGND Headers
AGND
DVSYS_VDSYS
S17
S18
DGND
S19
S20
R4
1
DGND
AGND
R101
0
R99
0
R102
0
R100
0
R103
0
0
2 INT
4 EXT
6
8
TEST/SBWTCK
10
12
14
JTAG
H
TCK
DGND
R48
330
TEST/SBWTCK
1 JP6
1 JP7
TDO 1 JP5
DRESET 2
DTCK 2
DTMS 2
DTDI
RESET 3
TCK 3
TMS 3
TDI
JP13
CBOUT
DGND
1
3
5
7
9
11
13
RESET
0.1uF
DGND
DGND
2
DVCC
TDO
TDI
TMS
TCK
RESET
1
1
2
3
4
R51
47K
DVCC
1 JP8
2
DTDO
3
TDO
1 JP4
2
3
1 JP9
2
3
I
DGND
K
RF_FIFOP
RF_FIFO
REACT
RF_SOMI
RF_SIMO
RF_CLK
LED4
S39
S38
S37
S36
S35
S34
S33
S32
S31
S30
S29
S28
S27
S26
S25
S24
S23
S22
S21
DGND
DRESET
DTCK
DTMS
DTDI
DTDO
TEST/SBWTCK
RF_GPIO1
RF_GPIO2
RF_CS
RF_SFD
RTCCLK
CBOUT
RF_CCA
RF_RESETCC
RF_VREG_EN
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
BTN3
DGND
DVCC / DGND Headers
SBWTDIO/NMI/RST 102
TCK/PJ.3 101
TMS/PJ.2 100
TCLK/TDI/PJ.1 99
TDO/PJ.0 98
SBWTCK/TEST 97
PM_TA1.0/P2.3 96
PM_TA0.2/P2.2 95
BSL_RX/PM_TA0.1/P2.194
BSL_TX/PM_TA0.0/P2.093
TRCCLK/TACLK/P11.592
CBOUT/P11.4 91
TA2.1/P11.3 90
TA1.1/P11.2 89
CB3/TA3.1/P11.1 88
S0/P11.0 87
S1/P10.7 86
S2/P10.6 85
S3/P10.5 84
S4/P10.4 83
S5/P10.3 82
S6/P10.2 81
S7/P10.1 80
S8/P10.0 79
S9/P9.7 78
S10/P9.6 77
S11/P9.5 76
S12/P9.4 75
S13/P9.3 74
S14/P9.2 73
S15/P9.1 72
S16/P9.0 71
DVSS2 70
DVSYS 69
S17/P8.7 68
S18/P8.6 67
S19/P8.5 66
S20/P8.4 65
MSP430F6779IPEU
P4.1/PM_UCA3RXD/M_UCA3SOMI
P4.2/PM_UCA3TXD/PM_UCA3SIMO
P4.3/PM_UCA3CLK
P4.4/PM_UCB1SOMI/PM_UCB1SCL
P4.5/PM_UCB1SIMO/PM_UCB1SDA
P4.6/PM_UCB1CLK
P4.7/PM_TA3.0
P6.1/SD4DIO/S39
P6.2/SD5DIOS38
P6.3/SD6DIO/S37
P6.4/S36
P6.5/S35
P6.6/S34
P6.7/S33
P7.0/S32
P7.1/S31
P7.2/S30
P7.3/S29
P7.4/S28
P7.5/S27
P7.6/S26
P7.7/S25
P8.0/S24
P8.1/S23
P8.2/S22
P8.3/S21
R45
R44
K
Voltage Monitor
I
DNP
H
DNP
G
XIN
XOUT
AUXVCC3
RTCCAP1
RTCCAP0
P1.5/SMCLK/CB0/A5
P1.4/MCLK/CB1/A4
P1.3/ADC10CLK/A3
P1.2/ACLK/A2
P1.1/TA2.1/VEREF+/A1
P1.0/TA1.1/VEREF-/A0
P2.4/PM_TA2.0
P2.5/PM_UCB0SOMI/PM_UCB0SCL
P2.6/PM_UCB0SIMO/PM_UCB0SDA
P2.7/PM_UCB0CLK
P3.0/PM_UCA0RXD/PM_UCA0SOMI
P3.1/PM_UCA0TXD/PM_UCA0SIMO
P3.2/PM_UCA0CLK
P3.3/PM_UCA1CLK
P3.4/PM_UCA1RXD/PM_UCA1SOMI
P3.5/PM_UCA1TXD/PM_UCA1SIMO
COM0
COM1
P1.6/COM2
P1.7/COM3
P5.0/COM4
P5.1/COM5
P5.2/COM6
P5.3/COM7
LCDCAP/R33
P5.4/SDCLK/R23
P5.5/SD0DIO/LCDREF/R13
P5.6/SD1DIO/R03
P5.7/SD2DIO/CB2
P6.0/SD3DIO
P3.6/PM_UCA2RXD/PM_UCA2SOMI
P3.7/PM_UCA2TXD/PM_UCA2SIMO
P4.0/PM_UCA2CLK
BTN2
D
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
1
2
3
4
5
6
7
8
9
ACLK
BTN2 10
11
BTN1
LED6 12
13
SCL
14
SDA
LED5 15
RS232_RXD 16
RS232_TXD 17
18
IR_SD 19
IR_RXD 20
IR_TXD 21
COM0 22
COM1 23
COM2 24
COM3 25
Vsupply
LED3 26
LED2 27
LED1 28
29
ACT
30
R33
31
R23
32
R13
DGND 33
VMON 34
35
EZ-RF_RXD 36
EZ-RF_TXD 37
38
XIN
XOUT
AUXVCC3
BTN3
BTN4
SMCLK
MCLK
VCORE
DVSS1
DVCC
VDSYS
AUXVCC1
AUXVCC2
VASYS1
AVCC
AVSS1
SD6N0
SD6P0
SD5N0
SD5P0
SD4N0
SD4P0
VREF
AVSS2
VASYS2
SD3N0
SD3P0
SD2N0
SD2P0
SD1N0
SD1P0
SDPN0
SD0P0
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
DGND
BTN1
DVCC
1
R46
560k
AGND
VASYS1/2
ININ+
V3V3+
V2V2+
V1V1+
VCORE
DGND
DGND
F
I3I3+
I2I2+
I1I1+
VREF
SMCLK
MCLK
ACLK
RTCCLK
DVCC
DVCC
R53
DGND
100K
R42
R23
SV1
R13
DVCC
DVSYS_VDSYS
AUXVCC1
AUXVCC2
VASYS1/2
5
4
3
2
1
4.7uF
DVCC
2
DGND
DGND
SV2
E
C
User Buttons
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
BTN4
2
1
AVCC
C49
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
COM0
COM1
COM2
COM3
24
23
1
DVCC
Clock Headers
HD1
S39
S38
S37
S36
S35
S34
S33
S32
S31
S30
S29
S28
S27
S26
S25
S24
COM0
COM1
COM2
COM3
S23
S22
R33
560k
DGND
DVSYS_VDSYS DNP
+
AUXVCC3
C63
4
3 AUXVCC1
D44
2
1 AUXVCC2
R43
C40
DNP
LCD
B
LCD1
3
2
1
560k
XT1
XOUT
1 JP2
2
SCL
SDA
AUXVCC3
10k
R40
10k
R41
XIN
C37
12pF
LCD Contrast
AuxVcc Headers
12pF
D
LED5
DGND
I2C Pullups
LED6
LED4
AGND
AGND
C
LED_ACT R57
C36
4.7uF
ACT
C34
100nF
LED1
C33
LED3
C35
4.7uF
LED2
C43
LED2
C44
0.47uF 100nF
LED3
C25
100nF
A
LED1
C24
4.7uF
REACT
LED_REACT R58
C27
100nF
LED4
C26
4.7uF
100
100nF
B
100
C30
100nF
16
DVCC
R61
C23
4.7uF
15
DVCC
LED6
C22
100nF
14
R60
C28
4.7uF
13
LED5
C32
100nF
12
Status LEDs
DVSYS_VDSYS
C31
DVCC
C29
4.7uF
11
100
9
100
8
R59
7
AUXVCC3
R36
6
Digital Power
VASYS1/2
VASYS1/2
AVCC
10R
DVCC
5
VCORE
4
AUXVCC2
3
Analog Power
AUXVCC1
2
A
VREF
1
www.ti.com
2
3
4
5
6
L
7
8
9
10
11
12
13
14
15
16
Figure 3. Schematics Page 1
12
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
TIDU474 – September 2014
Submit Documentation Feedback
Design Files
www.ti.com
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
A
A
Analog Front-End (Voltage)
LINE1 L1
LINE1
47n
47n
C18
C7
1n
R23
R27
47n
R1
I1+
C20
4.3k
R7
R14
330k
330k
1k
C8
47p
15n
AGND
AGND
V1-
1k
C
C9
AGND
AGND
47n
B
V1+
C1
R32
NEUTRAL
C76
12k
R22
CUR1-
CUR1-
12k
R26
TVS2
I1-
SMAJ5.0CA
C
R28
C19
4.3k
R6
330k
R15
R21
CUR1+
CUR1+
R5
S20K275
EXCML20A
V1
I1+
P1+1
2.37K
Analog Front-End (Current)
B
47p
I1-
AGND
4.3k
4.3k
D
D
V2
1n
47n
C16
R31
CUR2-
C5
R105
47n
R8
R9
R10
R16
330k
330k
330k
1k
R17
I2+
C64
R2
4.3k
C65
R29
12k
R106
C17
47n
12k
I2-
R104
TVS3
E
4.3k
S20K275
R30
CUR2+
SMAJ5.0CA
I2+
EXCML20A
C2
C10
47p
15n
AGND
NEUTRAL
47n
E
R33
AGND
AGND
V2-
1k
C11
I2AGND
4.3k
4.3k
V2+
2.37K
P2+1
LINE2 L3
LINE2
47p
AGND
F
F
I3+
C80
LINE3
47n
EXCML20A
R11
R12
R13
R18
330k
330k
330k
1k
1n
V3
C78
R124
CUR3-
C77
R126
47n
4.3k
V3+
2.37K
4.3k
47n
P3+1
R19
R127
C79
C81
R122
12k
12k
I3-
R125
TVS4
G
4.3k
R3
S20K275
R123
CUR3+
SMAJ5.0CA
I3+
LINE3 L5
AGND
C3
C12
47p
15n
G
AGND
47n
NEUTRAL
I3-
4.3k
L6
R34
NEUTRAL EXCML20A
V3-
1k
C13
AGND
47p
H
H
AGND
R129
R133
C84
4.3k
47n
C83
R130
CURN-
IN+
C85
1n
47n
C82
R132
47n
4.3k
C86
12k
12k
IN-
4.3k
R128
TVS1
I
SMAJ5.0CA
CURN+
R131
IN+
I
AGND
47n
IN-
4.3k
K
K
L
L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Figure 4. Schematics Page 2
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
13
Design Files
1
2
www.ti.com
3
4
5
6
7
8
9
10
11
12
13
14
15
16
A
A
Un-isolated VCC from AC Mains
B
1mH
VCC_PL
L7
NEUTRAL
51.1
R96
B160
D23
D
C45
0.01uF
C60
C61
.056uF
100pF
31.6k
2.2uF
R37
NEUTRAL
R97
D17
C
NEUTRAL
10k
1N4757A
C48
47uF
R98
D22
1N4007
10
9
8
7
6
PH
GND
COMP
VSENSE
PWRGD
22.1k
1N4757A
D19
BOOT
VIN
EN
SS/TR
RT/CLK
1M
D
D21
+
100
1N4757A
1
2
3
4
5
C62
R95
D20
1N4007
100
R94
R38
100
R93
R35
P3+1
C50
0.22uF/305VAC
33.2K
0.22uF/305VAC C46
U3
TPS54060_DGQ_10
Vsupply
C102
P2+1
D18
1N4007
1M
R92
C
100uF/100V
C39
0.22uF/305VAC
P1+1
0.1uF
C47
B
NEUTRAL
NEUTRAL
E
E
R39
0
NEUTRAL DGND
F
F
Isolated VCC from AC Mains
P3+1
G
L
L
N
N
26
26
22
22
C100
G
4.7u/400V
I
NC
VO-
VCC_ISO
ZD3
+
NC
C42
VO+
150uF
C101
VO+
H
0.1uF
NEUTRAL
VO-
SMAJ5.0ABCT
DGND
H
I
DVCC
3
2
1
JP3
VCC Select
VCC_PL
K
VCC_ISO
K
L
L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Figure 5. Schematics Page 3
14
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
TIDU474 – September 2014
Submit Documentation Feedback
Design Files
www.ti.com
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
A
A
B
B
Isolated RS232 Communication
IR Pulse In/Out
Act / React
DVCC
VCC
47
D26
LL103A
DGND
10uF
DB9_GND
C54
0.1uF
10uF
EEPROM
2.2k
Q1
BC857BSMD
1k
PS8802
Q2
BC857BSMD
SCL
6
7
A2
A1
A0
24C02CSN
R67
1.5k
DGND
SCL
WP
3
2
1
8
IC1
R62
DNP
C
ACT
TIL191
1k
OPTO1
1
4
2
1
3
REACT
D
TIL191
DGND
DGND
VCC
SDA 5
E
EZ-RF Connect
EZ-RF
DGND
EZ-RF_TXD
DVCC
SDA
DGND
EZ-RF_RXD
GND
4
R69
UART_TX
R66
EEPROM
Array
5
10k
3
R64
TX_EN
RS232_TXD
2
1
F
2
1
DVCC
RS-232
220
8
7
6
R63
2
3
VCC
2
LL103A
U1
4
2
R68 DVCC 2
REACT
JP111
DVCC
68
2
DGND
G1
D24
DB9_-12V
1
1k
DGND
DGND
G2
9
8
7
6
5
4
3
2
1
C56
E
R65
JP121
IRDA
0.1uF
C55
PS8802
DGND
ACT
D25
3
UART_RX
DVCC
R72
C41
DNP
R70
RX_EN
5
2
1
DGND
2
D27
2.2k
0.1uF
RS232_RXD
8
7
6
R71
C57
C52
4.7uF
LL103A
DB9_+12V
U2
D
C51
VCC2
TXD
RXD
SD
VCC1
GND
IR_TXD
IR_RXD
IR_SD
0.1uF
DVCC
1k
R78
LL103A
R47
OPTO2
C
1
2
3
4
5
6
F
SL127L6TH
DGND
G
G
RF Daughter Card
RF_VREG_EN
RF_RESETCC
RF_FIFO
RF_FIFOP
I
R74
R76
R80
R82
0
0
0
0
1
3
5
7
9
11
13
15
17
19
2
4
6
8
10
12
14
16
18
20
0
0
0
0
0
0
0
0
R75
R81
R83
R84
R85
R86
R88
R91
RF_FIFO
RF_FIFOP
RF_CCA
RF_SFD
RF_CS
RF_CLK
RF_SIMO
RF_SOMI
R79
0
RF_RESETCC
R87
0
RF_GPIO1
R90
0
C58
10uF
0.1uF
C59
DVCC
H
H
1
3
5
7
9
11
13
15
17
19
2
4
6
8
10
12
14
16
18
20
0
0
R73
R77
I
DGND
0
R89
RF_GPIO2
RF1
RF2
DGND
K
K
L
L
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Figure 6. Schematics Page 4
Bill of Materials
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
15
Design Files
www.ti.com
Table 5. BOM
Qty
16
Value
Digikey #
Description
Eagle Library Package
Board Designator
1
24C02CSN
24LC02B-I/SN-ND
IC EEPROM 2KBIT 400KHZ
8S
24C02CSN
IC1
1
32.768 KHZ
300-8341-1-ND
CRYSTAL 32.768 KHZ 6PF
SM
LF Crystal
XT1
2
12pF
311-1059-1-ND
CAP CER 12PF 50V 5% NPO C-EUC0603
C37 C40
4
1n
399-1136-1-ND
CAP CER 0.001UF 50V 10%
X
C-EUC0805
C65 C76 C81 C86
3
15n
311-1143-1-ND
CAP CER 0.015UF 50V 10%
X
C-EUC0805
C8 C10 C12
16
47nF
399-8092-1-ND
CAP CER 0.047UF 25V Y5V
060
C-EUC0805
C17 C19 C5 C7 C16 C18
C20 C64 C77 C78 C79 C80
C82 C83 C84 C85
9
100nF
311-1343-1-ND
CAP CER 0.1UF 50V Y5V
060
C-EUC0603
C23 C25 C27 C28 C30 C31
C33 C36 C43
7
0.1uF
311-1343-1-ND
CAP CER 0.1UF 50V Y5V
060
C-EUC0603
C41 C42 C52 C53 C54 C57
C59
2
0.47uF
311-1428-1-ND
CAP CER 0.47UF 16V 10%
X7
C-EUC0603
C38 C44
9
4.7uF
311-1455-1-ND
CAP CER 4.7UF 10V 10%
X5R
C-EUC0603
C22 C24 C26 C29 C32 C34
C35 C51 C49
6
47p
311-1484-1-ND
CAP CER 47PF 500V 5%
NPO
C-EUC0805
C1 C2 C3 C9 C11 C13
1
10uF
399-3685-1-ND
CAP TANT 10UF 6.3V 20%
12
CPOL-USCT3216
C55 C56 C58
1
4.7u/400V
399-6097-ND
CAP ALUM 4.7UF 400V 20%
R
CPOL-USE5-10.5
C100
8
-
3M9447-ND
CONN HEADER VERT SGL
2P
JP1E
ACT JP2 JP11 JP12 REACT
RX_EN TX_EN HD1
8
-
3M9448-ND
CONN HEADER VERT SGL
3P
JP2E
JP3 JP4 JP5 JP6 JP7 JP8
JP9 JP10 AUXVCC3
8
-
961105-6404-AR
CONN HEADER VERT SGL
5P
MA05-1
SV2
3
-
3M9449-ND
CONN HEADER VERT SGL
4P
MA04-1
DGND DVCCs
1
-
A106735-ND
CONN HEADER VERT DUAL JP2Q
SV1
4
S20K275
495-1417-ND
VARISTOR 275V RMS 20MM R S20K275
R1 R2 R3
2
Orange
511-1245-ND
LED 3.1MM 610NM ORANGE LED3MM
LED_3 LED_4
2
Green
511-1247-ND
LED 3.1MM 563NM GREEN
T
LED_1 LED_6
Three Phase Rogowski Coil Based E-Meter Solution
R LED3MM
TIDU474 – September 2014
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
Design Files
www.ti.com
Table 5. BOM (continued)
Qty
Value
Digikey #
Description
Eagle Library Package
Red
511-1249-ND
LED 3.1MM 650NM RED
TRAN
2
Yellow
511-1251-ND
LED 3.1MM 585NM YELLOW LED3MM
T
LED_2 LED_5
2
BC857BSMD
568-6094-1-ND
TRANSISTOR PNP 45V
100M
BC857BSMD
Q1 Q2
1
TFBS4711-TT1
751-1068-1-ND
TXRX IRDA 115.2KBIT
1.9MM
TFBS4711-TT1
IRDA
1
-
A32036-ND
CONN D-SUB RCPT STR
9PO
F09VP
RS1
4
LL103A
LLSD103ADICT-ND
DIODE SCHOTTKY 40v
350M
D-SOD-80
D24 D25 D26 D27
1
-
MHC14K-ND
CONN HEADER 14 POS
STR
ML14
JTAG
6
EXCML20A
P10191CT-ND
BEAD CORE 4A 100 MHZ
080
EXCELSA390805
L1 L3 L5 L6
1
150uF
P14374-ND
CAP ALUM 150UF 10V 20%
R
CPOL-EUE2-5
C101
4
-
P8079SCT-ND
SWITCH TACTILE SPST-NO
0
PB
BTN1 BTN2 BTN3 BTN4
RESET
2
TIL191
PS2501-1A-ND
OPTOCOUPLER 1CH
TRANS
TIL191
OPTO1 OPTO2
2
PS8802
PS8802-1-F3-AXCT-ND
OPTOISOLATOR ANALOG
HS
PS8802
U1 U2
1
68
RMCF0603FT68R0CT-ND
RES TF 68 OHM 1% 0.1W
060
R-EU_R0603
R65
8
100
RMCF0603JT100RCT-ND
RES 100 OHM 1/10W 5%
0603
R-EU_R0603
R54 R55 R56 R57 R58 R59
R60 R61
2
1k
RMCF0603JT1K00CT-ND
RES 1K OHM 1/10W 5%
0603
R-EU_R0603
R62 R68 R72 R78
1
1.5k
RMCF0603JT1K50CT-ND
RES 1.5K OHM 1/10W 5%
060
R-EU_R0603
R67
1
220
RMCF0603JT220RCT-ND
RES 220 OHM 1/10W 5%
0603
R-EU_R0603
R64
2
2.2k
RMCF0603JT2K20CT-ND
RES 2.2K OHM 1/10W 5%
060
R-EU_R0603
R69 R71
1
330
RMCF0603JT330RCT-ND
RES 330 OHM 1/10W 5%
0603
R-EU_R0603
R48
1
47K
RMCF0603JT47K0CT-ND
RES 47K OHM 1/10W 5%
0603
R-EU_R0603
R51
TIDU474 – September 2014
Submit Documentation Feedback
LED3MM
Board Designator
2
LED_ACT LED_REACT
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
17
Design Files
www.ti.com
Table 5. BOM (continued)
Qty
18
Value
Digikey #
Description
Eagle Library Package
Board Designator
1
47
RMCF0603JT47R0CT-ND
RES 47 OHM 1/10W 5%
0603
R-EU_R0603
R47
18
0
RMCF0603ZT0R00CT-ND
RES 0.0 OHM 1/10W 0603
SM
R-EU_R0603
R73 R74 R75 R76 R77 R79
R80 R81 R82 R83 R84 R85
R86 R87 R88 R89 R90 R91
5
560k
RMCF0603FT560KCT-ND
RES TF 560K OHM 1% 0.125 R-EU_R0603
R42 R43 R46
4
100K
RMCF0603JT100KCT-ND
RES 100K OHM 0.1W 5%
0805
R-EU_R0603
R49 R50 R52 R53
3
10k
RMCF0603JT10K0CT-ND
RES 10K OHM 0.1W 5%
0805
R-EU_R0603
R40 R41 R63
1
10R
RMCF0805JT10R0CT-ND
RES 10 OHM 1/8W 5% 0805
S
RES0805
R36
8
12k
311-12.0KCRCT-ND
RES 12k OHM 1/8W 5%
0805 S
RES0805
R22 R26 R29 R104 R122
R125 R128 R131
16
4.3k
311-4.3KARCT-ND
RES 4.3k OHM 1/8W 5%
0805 S
RES0805
R21 R23 R27 R28 R30 R31
R105 R106 R123 R124 R126
R127 R129 R130 R132 R133
6
1k
RMCF0805JT1K00CT-ND
RES 1.0K OHM 1/8W 5%
0805
RES0805
R14 R16 R18 R32 R33 R34
3
2K37
RMCF0805FT2K37CT-ND
RES 2.37K OHM 1/8W 1%
080
RES0805
R15 R17 R19
9
330k
RMCF0805JT330KCT-ND
RES 330K OHM 1/8W 5%
0805
RES0805
R5 R6 R7 R8 R9 R10 R11
R12 R13
7
0
RMCF0805ZT0R00CT-ND
RES 0.0 OHM 1/8W 0805
SMD
RES0805
R4 R39 R99 R100 R101
R102 R103
2
-
Must Order From Samtec
CONN HEADER 20POS
1.27M
TFM-110-02-SM-D-A-K
RF1 RF2
1
SMAJ5.0ABCT
SMAJ5.0ABCT-ND
DIODE TVS 5.0V 400W UNI
5
DIODE-DO214AC
ZD3
4
SMAJ5.0CA
SMAJ5.0CABCT-ND
DIODE TVS 5.0V 400W BI
5%
SMAJ5.0CA
TVS1 TVS2 TVS3 TVS4
1
SL127L6TH
Mill-Max 850-10-006-20001000
SL127L6TH
EZ-RF
1
TI_160SEG_LCD
TI_160SEG_LCD
LCD1
DNP
R-EU_R0603
R44 R45
DNP
DNP
C63
1
DNP
R-EU_R0603
R66
1
DNP
R-EU_R0603
R70
Custom-made
Three Phase Rogowski Coil Based E-Meter Solution
TIDU474 – September 2014
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
Design Files
www.ti.com
Table 5. BOM (continued)
Qty
Value
Digikey #
1
CUI_XR
102-1801-ND
1
MSP430F67791AIPEU
MSP430F67791AIPEUR-ND
1
100uF
3
Description
Eagle Library Package
Board Designator
Isolated Power Supply, 3.3 V,
700mA
CUI_XR
U$1
1189-1020-ND
CAP Electrolytic 100uF 100V
2
10 mm x 20 mm, 5 mm leads
C102
0.22uF
495-2320-ND
CAP poly 0.22uF
305VAC/630V
18 mm x 7 mm, 15 mm leads
C39 C46 C50
1
2.2uF
445-4497-2-ND
CAP Ceramic 2.2uF 100V
X7R
1210
C48
1
0.01uF
445-5100-1-ND
CAP CER 10000PF 25V 10%
X
603
C45
1
47uF
587-1383-1-ND
CAP Ceramic 47uF 10V X5R
1
1210
C62
1
0.1uF
399-1095-1-ND
CAP Ceramic 0.1uF 10V X5R 603
0
C47
1
.056uF
490-6433-1-ND
CAP Ceramic .056uF 25V
X7R
603
C60
1
100pF
399-6841-1-ND
CAP Ceramic 100pF 25V
NPO,
603
C61
1
B160
641-1107-1-ND
Diode Schottky 1A 60V B160
S
SMB
D23
3
48V
1N4757ADICT-ND
Diode Zener 51V 1W
1N4757A
DO-41
D17 D19 D21
3
1N4007
1N4007FSCT-ND
DIODE GEN PURPOSE
1000V
DO-41
D18 D20 D22
1
1mH
Must order from CoilCraft (M
Inductor, SMT, MSS1038-105 0.402 x 0.394 inch
(
L7
1
1M
A102234CT-ND
RES 1M OHM 1/16W 0.1%
0603
603
R35,R38
1
33.2k
RNCS0603BKE33K2CT-ND
RES 33.2K OHM 1/16W .1%
06
603
R37
1
22.1k
A102241CT-ND
RES 22.1K OHM 1/16W 1%
06
603
R95
1
51.1
A102292TR-ND
RES 51.1 OHM 1/16W 1%
060
603
R96
1
31.6k
A102261DKR-ND
RES 31.6K OHM 1/16W 1%
06
603
R97
1
10.0k
A102331CT-ND
RES 10.0K OHM 1/16W 0.1% 603
0
R98
3
100
P100W-2BK-ND
RES 100 OHM 2W 5% AXIAL 12 mm length, 4 mm diameter R92 R93 R94
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
19
Design Files
www.ti.com
Table 5. BOM (continued)
Qty
1
20
Value
TPS54060ADGQ
Digikey #
296-30339-5-ND
Description
IC REG BUCK ADJ 0.5A
10MS
Three Phase Rogowski Coil Based E-Meter Solution
Eagle Library Package
MSOP-10
Board Designator
U3
TIDU474 – September 2014
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
Design Files
www.ti.com
PBC Layout Prints
The layout implemented is a 2-layer design. This section illustrates the PCB layout prints.
Figure 7. Top Layer Plot 1
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
21
Design Files
www.ti.com
Figure 8. Bottom Layer Plot 2
22
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
TIDU474 – September 2014
Submit Documentation Feedback
Design Files
www.ti.com
Figure 9. Ldi/dt Input Front End
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
23
Design Files
8.2
www.ti.com
CAD Project
To download the CAD project files, see the design files at TIDM-3PHMETER-ROGOWSKI .
8.3
Gerber Files
To download the Gerber files, see the design files at TIDM-3PHMETER-ROGOWSKI
9
Software Files
To download the software files, see the design files at TIDM-3PHMETER-ROGOWSKI
24
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
TIDU474 – September 2014
Submit Documentation Feedback
About the Author
www.ti.com
10
About the Author
ANIRBAN GHOSHworks at TI as an Applications Engineer in the Smart Grid Business Unit, for electricity
metering and metrology related projects.
TIDU474 – September 2014
Submit Documentation Feedback
Three Phase Rogowski Coil Based E-Meter Solution
Copyright © 2014, Texas Instruments Incorporated
25
IMPORTANT NOTICE FOR TI REFERENCE DESIGNS
Texas Instruments Incorporated ("TI") reference designs are solely intended to assist designers (“Buyers”) who are developing systems that
incorporate TI semiconductor products (also referred to herein as “components”). Buyer understands and agrees that Buyer remains
responsible for using its independent analysis, evaluation and judgment in designing Buyer’s systems and products.
TI reference designs have been created using standard laboratory conditions and engineering practices. TI has not conducted any
testing other than that specifically described in the published documentation for a particular reference design. TI may make
corrections, enhancements, improvements and other changes to its reference designs.
Buyers are authorized to use TI reference designs with the TI component(s) identified in each particular reference design and to modify the
reference design in the development of their end products. HOWEVER, NO OTHER LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL
OR OTHERWISE TO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT, AND NO LICENSE TO ANY THIRD PARTY TECHNOLOGY
OR INTELLECTUAL PROPERTY RIGHT, IS GRANTED HEREIN, including but not limited to any patent right, copyright, mask work right,
or other intellectual property right relating to any combination, machine, or process in which TI components or services are used.
Information published by TI regarding third-party products or services does not constitute a license to use such products or services, or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
TI REFERENCE DESIGNS ARE PROVIDED "AS IS". TI MAKES NO WARRANTIES OR REPRESENTATIONS WITH REGARD TO THE
REFERENCE DESIGNS OR USE OF THE REFERENCE DESIGNS, EXPRESS, IMPLIED OR STATUTORY, INCLUDING ACCURACY OR
COMPLETENESS. TI DISCLAIMS ANY WARRANTY OF TITLE AND ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT, QUIET POSSESSION, AND NON-INFRINGEMENT OF ANY THIRD PARTY
INTELLECTUAL PROPERTY RIGHTS WITH REGARD TO TI REFERENCE DESIGNS OR USE THEREOF. TI SHALL NOT BE LIABLE
FOR AND SHALL NOT DEFEND OR INDEMNIFY BUYERS AGAINST ANY THIRD PARTY INFRINGEMENT CLAIM THAT RELATES TO
OR IS BASED ON A COMBINATION OF COMPONENTS PROVIDED IN A TI REFERENCE DESIGN. IN NO EVENT SHALL TI BE
LIABLE FOR ANY ACTUAL, SPECIAL, INCIDENTAL, CONSEQUENTIAL OR INDIRECT DAMAGES, HOWEVER CAUSED, ON ANY
THEORY OF LIABILITY AND WHETHER OR NOT TI HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, ARISING IN
ANY WAY OUT OF TI REFERENCE DESIGNS OR BUYER’S USE OF TI REFERENCE DESIGNS.
TI reserves the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per
JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant
information before placing orders and should verify that such information is current and complete. All semiconductor products are sold
subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its components to the specifications applicable at the time of sale, in accordance with the warranty in TI’s terms
and conditions of sale of semiconductor products. Testing and other quality control techniques for TI components are used to the extent TI
deems necessary to support this warranty. Except where mandated by applicable law, testing of all parameters of each component is not
necessarily performed.
TI assumes no liability for applications assistance or the design of Buyers’ products. Buyers are responsible for their products and
applications using TI components. To minimize the risks associated with Buyers’ products and applications, Buyers should provide
adequate design and operating safeguards.
Reproduction of significant portions of TI information in TI data books, data sheets or reference designs is permissible only if reproduction is
without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. TI is not responsible or liable for
such altered documentation. Information of third parties may be subject to additional restrictions.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards that
anticipate dangerous failures, monitor failures and their consequences, lessen the likelihood of dangerous failures and take appropriate
remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use of any TI components in
Buyer’s safety-critical applications.
In some cases, TI components may be promoted specifically to facilitate safety-related applications. With such components, TI’s goal is to
help enable customers to design and create their own end-product solutions that meet applicable functional safety standards and
requirements. Nonetheless, such components are subject to these terms.
No TI components are authorized for use in FDA Class III (or similar life-critical medical equipment) unless authorized officers of the parties
have executed an agreement specifically governing such use.
Only those TI components that TI has specifically designated as military grade or “enhanced plastic” are designed and intended for use in
military/aerospace applications or environments. Buyer acknowledges and agrees that any military or aerospace use of TI components that
have not been so designated is solely at Buyer's risk, and Buyer is solely responsible for compliance with all legal and regulatory
requirements in connection with such use.
TI has specifically designated certain components as meeting ISO/TS16949 requirements, mainly for automotive use. In any case of use of
non-designated products, TI will not be responsible for any failure to meet ISO/TS16949.IMPORTANT NOTICE
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2014, Texas Instruments Incorporated