ti designs mechanical-to-electronic converter with three
TRANSCRIPT
TI DesignsMechanical-to-Electronic Converter with Three LCSensors for Gas or Water Meter
TI Designs Design FeaturesTI Designs provide the foundation that you need • Ultra-Low Power Designincluding methodology, testing and design files to • Contactless Rotation Detectionquickly evaluate and customize the system. TI Designs
• Enable Runtime Calibration with Very Slowhelp you accelerate your time to market.Rotation
Design Resources • Self-Calibration for Long-Term Operation• Full Platform Design with Socket for Add-On
Design PageTIDM-3LC-METER-CONV Module and Flow Emulation by a Motor BoardMSP430FR6989 Product Folder • Onboard Debugging CircuitCC1120 Product FolderTPS62237 Product Folder Featured Applications
• Mechanical-to-Electronic Converter for Flow MeterASK Our E2E Experts • Gas MeterWEBENCH® Calculator Tools • Water Meter
• Heat Meter• Rotation Detection• Motor Position Detection
An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and otherimportant disclaimers and information.
All trademarks are the property of their respective owners.
1TIDU486–August 2014 Mechanical-to-Electronic Converter with Three LC Sensors for Gas or WaterMeterSubmit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
System Description www.ti.com
1 System DescriptionA mechanic-to-electronic convert is designed for rotational flow meters. This reference design is built usingthe Extended Scan IF (ESI) of the MSP430FR6989 and three LC sensors. The reading of the meter isdisplayed on LCD. If an RF module, like CC1120, is added in, an AMR function is then enabled.
The system is built on the EVM430-FR6989. This board can be divided into three boards: the main board,the sensor board, and the motor board. The main board of EVM consists of an MSP430FR6989, a sensorboard connector, an RF module socket, and a debugger circuit. The sensor board is constructed withthree LC sensors. The motor board is also provided to drive a rotor disc to emulate water or gas flow,which moves the rotating disc in a flow meter.
This system is an ultra-low power design using the latest TI MCU MSP430FR6989 with FRAM to store theprogramming code. The MSP430FR6989 has a built-in module of ESI. The system block diagram showsall the elements to implement a converter (Figure 1).
The main board of EVM consists of an MSP430FR6989, a socket for add-on modules, a USB connection,and a sensor board connector. The bottom side of the main board has an onboard eZ-FET lite connectedto the MCU. Program and debug the MCU firmware by directly connecting the board with a USB cable toPC. The IDE is TI's Code Composer Studio™. The debugging circuit also has an HID connection, whichcan receive the command of a dedicated PC GUI for this EVM.
2 Design Features
2.1 Ultra-Low Power DesignThe MSP430FR6989 is an ultra-low power MCU that has a FRAM of up to 128 KB for code and data.Peripherals include ESI, RTC, ADC12, CRC, AES256, MPY32, eUSCI for communication, Comp_E fortouch key module, an LCD, and six timers.
During the operation of the reference design, only the ESI, a timer, and the LCD continuously work with anoscillation crystal of 32,768 Hz. The CPU and other peripherals are off, in low power mode 3 (LPM3). Thewhole system takes around 11 µA for a sample rate of 500 Hz with three LC sensors without an LCD.
2.2 Contactless Rotation DetectionA mechanical flow meter needs to have a small rotating disc driven by the gears of the meter. Theconverter detects the number of times the disc rotates without contact. One half of the disc is covered withmetal in a semi-circle and the other half with non-metal in another semi-circle.
2 Mechanical-to-Electronic Converter with Three LC Sensors for Gas or Water TIDU486–August 2014Meter Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
Sensor of Ch0
Sensor of Ch1
Sensor of Ch2
Clockwise Rotation
www.ti.com Design Features
2.3 Sensor Board with Three LC SensorsAn LC sensor consists of an inductor and a capacitor to form a tank oscillator. This sensor is the provensolution of low power consumption and reliable for long-term continuous operation of flow meters. Whenthe sensor is excited by a very short pulse within 1 µs, it starts oscillating in its resonant frequency. Theinductor then generates a magnetic field. Once the metal part of the rotating disc is cutting the magneticfield, an eddy current is formed in the metal, which absorbs the magnetic energy from the inductor andreduces the amplitude of the oscillating signal. The comparator and the DAC of the ESI can detect thissignal change to detect the position of the rotating disc and count the number of rotations.
A long-term operation needs a system to adjust the signal due to environmental change or componentsaging issues (see Section 2.4).
When the rotating disc is moving quickly, a complete rotation can be detected by each LC sensor. Duringthe self-calibrating process, each sensor can find the signal level of metal and non-metal; one is high,another is low. Using this information, the calibration process can find out the mid-level voltage as areference to determine the position of the disc.
However, in a mechanical-to-electronic converter, the rotating disc usually moves slowly, which does notallow the mentioned calibration algorithm to work. To cope with this issue, three sensors are used andplaced 120 degrees apart to each other (see Figure 1). This way, the converter will always know thelocation of a sensor over the plate. An algorithm to calibrate the sensor of a known position can be formedand activated at any time, a core advantage of using three sensors.
Figure 1. Detection Sequence with Three LC Sensors
2.4 Self-Calibration for Long-Term OperationDue to the temperature, humidity, aging components, and signal drifts, a continuous adjustment circuit isnecessary to ensure the system is within the range of reliable operation. The ESI has a duplicated circuitinside that can be used to detect the overall drift of the system. This circuit will only be activatedperiodically to save power consumption. Once the drift is found, the design adjusts the DAC values of thecontinuous operating part of the ESI to align it to the signal position of maximum reliability.
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Design Features www.ti.com
2.5 Full Platform Design with Add-On Module Socket and Flow Emulation by a MotorBoardThe motor board provides a tool to emulate the rotating plate driven by the flow of water or gas. Therotating speed can be adjusted either manually or by the main board through the I2C link. The socket isconnecting with various communication ports, SPI, UART, and I/O of the MCU. Some existing TI RFmodules can directly plug into this socket to add on more features into the EVM. Engineers can alsodesign their own modules, like NFC/RFID, valve control, and so on, and test it with the system withoutreconfiguring the whole board.
The sensor board is standalone. Engineers can design their own customized sensor board and plug intothe main board for testing.
2.6 Built-In Debugging CircuitThe built-in debugging circuit facilitates the system setup without too many external connections ofdebugging tools. The bottom side of the main board has an onboard eZ-FET lite connected to the MCU.Engineers can program and debug the MCU firmware by directly connecting the board with a USB cableto the PC. The IDE is TI's Code Composer Studio™. The debugging circuit also has an HID connection,which can receive the command of a dedicated PC GUI for this EVM.
3 Block Diagram
Figure 2. System Block Diagram
4 Mechanical-to-Electronic Converter with Three LC Sensors for Gas or Water TIDU486–August 2014Meter Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
www.ti.com Circuit Design
4 Circuit Design
4.1 Main Board
Figure 3. Main Board
This main board is built on MCU MSP430FR6989 with an LCD display. This board is powered by USB toprovide 3.3 V through a buck converter. This board can be divided into seven parts and is a platform fordeveloping flow meters with RF and USB connections. The application software has code for the ESImodule for flow measurement, but the software does not connect to Part 1 and Part 6 in Table 1.
Table 1. Description of Main Board Layout
PART NUMBER DESCRIPTIONA socket for RF modules of sub-1 GHz or 2.4 GHz, connecting
Part 1 to the MCU with SPI and I/O. For details of RF modules, readthe CC1120 development kit.Through holes connecting to I/O of no connection. The headersPart 2 are the I2C connection.The JTAG debugger and a USB HID interface. The HIDPart 3 interface can connect the board to PC with a dedicated GUI.A reset button. This board does not have an on/off switch. ToPart 4 restart the firmware, push the reset button.This device has five push-button switches. The firmware does
Part 5 not have code for this part. Designers can use it to implement akey control.LED indicator, connecting to PJ.2 and PJ.3. For saving currentPart 6 consumption, remove the jumpers.The socket for the sensor board and connecting to the ESI ofPart 7 MCU.
5TIDU486–August 2014 Mechanical-to-Electronic Converter with Three LC Sensors for Gas or WaterMeterSubmit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
474474
474
Circuit Design www.ti.com
The core part of the hardware for flow measurement is the connection of the MCU's ESI to the sensorboard. A 470-nF capacitor connecting to ESICOM is used to stabilize the voltage of Vcc / 2. The ESI is aself-contained module inside the MCU.
For a low-power design, a 32,768-Hz crystal is used to continuously operate. To lower the powerconsumption further, turn on the LCD only when taking a reading is necessary. The rest of the MCUperipherals and its CPU are kept idle to save power. The CPU should only be active during a readingupdate and self-calibrating, which is done in a periodical manner lasting a few seconds to hoursdepending on the timer setting.
4.2 Sensor Board
Figure 4. Sensor Board
The sensor board is designed for LC sensors only. The sensors can be placed in different orientations.For the half-covered metal rotor disc, the three sensors are placed 120 degrees apart.
The selection of the inductor (L) and the capacitor (C) is an important factor to affect the powerconsumption. Find a detailed selection guide as an application note for other types of sensors.
6 Mechanical-to-Electronic Converter with Three LC Sensors for Gas or Water TIDU486–August 2014Meter Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
www.ti.com Circuit Design
4.3 Motor BoardThe motor board is to drive the rotor disc to emulate a gas or water flow. The battery socket is on the backof the board. The board consists of the following parts:
Figure 5. Motor Board
Table 2. Description of Motor Board Layout
PART NUMBER DESCRIPTIONPart 1 Two pins connecting to external powerPart 2 Switch to power on and off the motor board
2-wire Spy-Bi wire mode of JTAG. This mode can be used toPart 3 program and debug the firmwarePart 4 Variable resistor to vary the rotation speed
Buttons to select the rotation's direction. Also acts as a stopPart 5 buttonAn infrared sensor that provides feedback on the rotation speedPart 6 of the rotor disc
Part 7 A rotor disc half covered by copperPart 8 A connection header for I2C and UART
An I2C link can be connect to the main board. The motor board will receive the command from main boardto rotate in a proper speed and send back the record of the number of rotations.
7TIDU486–August 2014 Mechanical-to-Electronic Converter with Three LC Sensors for Gas or WaterMeterSubmit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
Start
Initialization
Start Timer for Re-Calibration
Update LCD
Re-Calibration
Q6 Flag?
Time to Re-Cal
Y
Y
Software Description www.ti.com
5 Software Description
Figure 6. Software Flowchart
The software optimizes the system's power consumption. As shown in Figure 6, the system starts withinitialization, which includes ports setting for low current leakage, LCD, ESI internal oscillator calibration,ESI registers, sampling rate, timing state machine (TSM) with auto-TSM calibration, optimal DAC level,and processing state machine (PSM) table setting. After initialization, the EVM can work well in low powermode with ESI and LCD as the only modules actively running. To avoid too many interrupts to wake upthe CPU, the system uses the Q6 flag in the PSM table. This flag is set only when the rotor disc isrotating.
The system is in LPM3 mode when the rotor disc does not rotate. To lower the power consumptionfurther, disable the LCD. Construct a key button to wake up the LCD when reading is necessary. For astable, long-running lifetime for the system, the design includes a runtime re-calibration to track the drift ofthe sensors and system. A timer with the variable constant Time_to_Recal is used to count the period forre-calibration.
Once the timer triggers a re-calibration call, the firmware calibrates without the need of waiting for the Q6flag. The three-LC system does not need the rotor disc to rotate during the re-calibration process.
8 Mechanical-to-Electronic Converter with Three LC Sensors for Gas or Water TIDU486–August 2014Meter Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
Jumper 3V3
www.ti.com Test Setup
6 Test Setup
Figure 7. System Setup for Measurement of Current Consumption
Before testing, the main board and motor board have to be programmed with firmware. Follow thisprocedure to test the current consumption of the reference design:1. Remove all jumpers of the main board except the jumper 3V3 and the ground jumper next to it.2. Disconnect the jumper 3V3 and connect it with a current meter.3. Set the rotor disc at 5 mm from the sensor board and switch off the motor.4. Power up the main board with a USB cable.5. Calibrate the TSM after powering up the main board. The LCD will show 0. wait until it turns to 8888,
then go to the next step.6. Switch on the motor and do not adjust the distance between the rotor and sensors. At this step, a
calibration for searching proper reference voltages of DAC is working. This calibration will last for onesecond.
7. Finish initial calibration. The LCD will keep counting the number of rotations.8. Turn off the LCD by pushing the black button.9. Read the current meter indicating the current consumption of the reference design without the LCD.
9TIDU486–August 2014 Mechanical-to-Electronic Converter with Three LC Sensors for Gas or WaterMeterSubmit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
Sampling Rate (Hz)
Cur
rent
con
sum
ptio
n (u
A)
0 200 400 600 800 1000 1200 14000
5
10
15
20
25
30
D001
Test Results www.ti.com
7 Test Results
Figure 8. System Current Consumption (µA) for Three LC Sensors
Figure 8 shows the current consumption of the MCU with three LC sensors, not including all currentflowing into the LCD, power, and other modules on the board. The data is taken by measuring the currentflowing into the MCU connected to three LC sensors with the LCD switched off, varying with differentsampling rate of the ESI of MSP430FR6989.
From the experimental data, the current consumption in MSP430FR6989 takes 19 nA per sample withthree LC sensors.
In the application of mechanical to electronic converter, the rotation speed of the rotor disc is very slow,less than 10 rotations per second. Using a sample rate of 99 Hz, the total current taken is only 3.3 µA . Asmall battery can be used.
Using three LC sensors, the runtime self-calibration can be done during a very slow rotation of the rotordisc.
10 Mechanical-to-Electronic Converter with Three LC Sensors for Gas or Water TIDU486–August 2014Meter Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated
DNPR11
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P9.2/ESICH2/ESITEST2/A10/C1069
P9.3/ESICH3/ESITEST3/A11/C1170
P9.4/ESICI0/A12/C1271
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3 4
5 6
7 8
9 10
11 12
13 14
15 16
ESI
MHDR2X8
TARGET_GND
TARGET_3V3
ESIVCCESICIESICI2ESICI0ESICH2/ESITEST2ESICH0/ESITEST0ESITEST4
TARGET_GNDESIVSSESICOMESICI3ESICI1ESICH3/ESITEST3ESICH1/ESITEST1
12
34
56
78
PORT_1_4
MHDR2X4
12
34
56
78
PORT_2_3
MHDR2X4
12
34
56
78
PORT_6_8
MHDR2X4
12
34
56
78
PORT_J
MHDR2X4
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
RF2
MHDR2X10
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
RF1
MHDR2X10
0.1uFC32
TARGET_GND
0RR440RR450RR46
0RR47
TARGET_GND
0RR480RR490RR500RR51
TARGET_GND
0RR570RR560RR550RR54
0RR530RR52
TARGET_3V3
RF_SPI1_CSNRF_GPIO_82RF_SPI1_MISO/RF_UART_TXDRF_SPI1_MOSI/RF_UART_RXD
RF_GPIO_17RF_GPIO_13
RF_SPI_CSNRF_SPI_SCLKRF_SPI_MOSIRF_SPI_MISO
RF_RESETRF_GPIO_81RF_GPIO_10
RF_SPI1_SCLK
LF
XO
UT
LF
XIN
HF
XO
UT
HF
XIN
PJ.0
PJ.1
PJ.1LED1LED2LFXINLFXOUTHFXINHFXOUTP6.0
P6.1P6.2
P6.0P6.1P6.2
RF_RESET RF_GPIO_81RF_GPIO_10 RF_GPIO_82
RF_SPI1_MOSI/RF_UART_RXDRF_SPI1_MISO/RF_UART_TXDRF_SPI1_SCLKRF_SPI1_CSN
RF_SPI_CSNRF_SPI_SCLKRF_SPI_MISORF_SPI_MOSI
RF_GPIO_17RF_GPIO_13
I2C_SDAI2C_SCLUART0_RXD UART0_TXD
P4.3P1.7
P1.0P1.1
P1.6P4.2
P2.0P2.1P2.2P2.3P3.4
P3.5 P3.6P3.7
P6.0P6.1P6.2P8.4P8.5P8.6P8.7
PJ.0PJ.1PJ.2PJ.3PJ.4PJ.5PJ.6PJ.7
EZFET_TARGET_TEST_SBWTCK
EZFET_TARGET_RST_SBWTDIO
BR
IDG
E_T
AR
GE
T_U
AR
T_
RX
D
BR
IDG
E_T
AR
GE
T_U
AR
T_
TX
D
0.1uF
C36
TARGET_GND
COM1
COM2
Up3
Down4
Select5
Right6
Left7
BUT
TARGET_GND
BUT_AIN
BUT_AIN2
BUT_AIN3
BUT_AIN4
BUT_AIN5
BUT_AIN2
BUT_AIN3
BUT_AIN4
BUT_AIN5 TARGET_GND
TARGET_GND TARGET_GND
DNP
R41
DNP
R40
TARGET_3V3
TARGET_3V3
www.ti.com Design Files
8 Design Files
8.1 SchematicsTo download the schematics, see the design files at TIDM-3LC-METER-CONV.
8.1.1 Main Board without the Debugging Circuit
Figure 9. MSP430FR6989 Schematic
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8.1.2 Sensor Board
Figure 10. Sensor Board Schematic
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8.1.3 Motor Board
Figure 11. Motor Board Schematic
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8.2 Bill of MaterialsTo download the bill of materials (BOM), see the design files at TIDM-3LC-METER-CONV.
Table 3. BOM: Main Board
MANUFACTURERDESIGNATOR VALUE QTY DESCRIPTION PACKAGE DIGIKEY PN REMARK MANUFACTURERPNCAPACITORSC100, C101, C200, Alternatives:GRM1555C1H100C201, C405, C406, 10 pF (NP0/C0G) 8 Chip Capacitor, C0G, 50 V, ±5% C0402 490-5921-1-ND NP0/C0G, 10 V, MurataJA01DC410, C412 ±5% or better
Alternatives:C10, C11, C403, GRM1555C1H22022 pF (NP0/C0G) 4 Chip Capacitor, C0G, 50 V, ±5% C0402 490-5868-1-ND NP0/C0G, 10 V, MurataC404 JA01D ±5% or betterAlternatives:GRM1555C1H330C109, C110 33 pF (NP0/C0G) 2 Chip Capacitor, C0G, 50 V, ±5% C0402 490-5936-1-ND NP0/C0G, 10 V, MurataJA01D ±5% or betterAlternatives: X5R,Chip Capacitor, X7R, 50 V, GRM155R71H102C111, C210 1000 pF 2 C0402 490-1303-1-ND 10 V, ±10% or Murata±10% KA01D betterAlternatives: X5R,Chip Capacitor, X7R, 100 V, GRM155R72A222C1 2200 pF 1 C0402 490-6367-1-ND 10 V, ±10% or Murata±10% KA01D better
C3, C5, C7, C9,C32, C36, C102, Alternatives: X5R,Chip Capacitor, X7R, 16 V, GRM155R71C104C104, C108, C202, 100 nF 16 C0402 490-3261-1-ND 10 V, ±10% or Murata±10% KA88DC204, C205, C400, betterC402, C407, C408
Alternatives: X5R,C105, C106, C206, Chip Capacitor, X7R, 16 V, GRM155R71C224220 nF 4 C0402 490-5418-1-ND 10 V, ±10% or MurataC207 ±10% KA12D betterAlternatives: X5R,Chip Capacitor, X5R, 10 V, GRM155R61A474C107, C208 470 nF 2 C0402 490-3264-1-ND 10 V, ±10% or Murata±10% KE15D betterAlternatives: X5R,Chip Capacitor, X7R, 25 V, GRM188R71E105C411, C415, C417 1 µF 2 C0603 490-5307-1-ND 10 V, ±10% or Murata±10% KA12D betterAlternatives: X5R,Chip Capacitor, X7R, 16V, - GRM21BR71C475C33, C401 4.7 µF 1 C0805 490-4522-1-ND 10 V, ±10% or Murata+10% KA73L betterAlternatives: X5R,C103, C203, C209, Chip Capacitor, X7R, 25 V, GRM31CR71E10610 µF 4 C1206 490-6518-1-ND 10 V, ±10% or MurataC409 ±10% KA12L better
RESISTORS
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Table 3. BOM: Main Board (continued)MANUFACTURERDESIGNATOR VALUE QTY DESCRIPTION PACKAGE DIGIKEY PN REMARK MANUFACTURERPN
R44, R45, R46,R47, R48, R49, Alternatives: ±5%R50, R51, R52, 0 R 15 Chip Resistor R0402 RC0402JR-070RL 311-0.0JRCT-ND Yageoor betterR53, R54, R55,R56, R57, R420
RC0402JR- Alternatives: ±5%R65 10 R 1 Chip Resistor R0402 311-10JRCT-ND Yageo0710RL or betterR407, R409, R412, RC0402JR- Alternatives: ±5%22 R 6 Chip Resistor R0402 311-22JRCT-ND YageoR413, R416, R417 0722RL or betterR100, R101, R201, RC0402JR- Alternatives: ±5%27 R 5 Chip Resistor R0402 311-27JRCT-ND YageoR203, R406 0727RL or better
RC0402JR- Alternatives: ±5%R405 33 R 1 Chip Resistor R0402 311-33JRCT-ND Yageo0733RL or betterRC0402JR- Alternatives: ±5%R211 100 R 1 Chip Resistor R0402 311-100JRCT-ND Yageo07100RL or better
R105, R202, R204, RC0402JR- Alternatives: ±5%390 R 4 Chip Resistor R0402 311-390JRCT-ND YageoR205 07390RL or betterR9, R10, R104, RC0402JR- Alternatives: ±5%470 R 2 Chip Resistor R0402 311-470JRCT-ND YageoR200 07470RL or better
RC0402JR- Alternatives: ±5%R103, R206, R408 1.5 k 3 Chip Resistor R0402 311-1.5KJRCT-ND Yageo071K5L or betterRC0402JR- Alternatives: ±5%R600, R601 2.2 k 2 Chip Resistor R0402 311-2.2KJRCT-ND Yageo072K2L or betterRC0402JR- Alternatives: ±5%R40, R41 10 k 2 Chip Resistor R0402 311-10KJRCT-ND Yageo0710KL or better
Alternatives: ±5% YageoR400, R401, R402, or betterRC0402JR-R403, R410, R411, 15.0 k 8 Chip Resistor R0402 311-15KJRCT-ND0715KL Alternatives: ±5%R414, R415 Yageoor betterR1, R106, R209, RC0402JR- Alternatives: ±5%47 k 4 Chip Resistor R0402 311-47KJRCT-ND YageoR404 0747KL or better
Alternatives: ±5%R102, R210 1 M 2 Chip Resistor R0402 RC0402JR-071ML 311-1.0MJRCT-ND Yageoor betterRC0402FR- Alternatives: ±1%R5, R6, R7, R8 5.6 k 4 Chip Resistor 1% R0402 311-5.6KLRCT-ND Yageo075K6L or betterRC0402FR- 311-100KLRCT- Alternatives: ±1%R3 100 k 1 Chip Resistor 1% R0402 Yageo07100KL ND or betterRC0402FR- 311-150KLRCT- Alternatives: ±1%R109 150 k 1 Chip Resistor 1% R0402 Yageo07150KL ND or better
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Table 3. BOM: Main Board (continued)MANUFACTURERDESIGNATOR VALUE QTY DESCRIPTION PACKAGE DIGIKEY PN REMARK MANUFACTURERPN
RC0402FR- 311-220KLRCT- Alternatives: ±1%R107, R108 220 k 2 Chip Resistor 1% R0402 Yageo07220KL ND or betterRC0402FR- 311-240KLRCT- Alternatives: ±1%R110 240 k 1 Chip Resistor 1% R0402 Yageo07240KL ND or better
INDUCTORS, DIODES, CRYSTALSL400 2.2 µH 1 SMD Inductor 3×3 mm NR3010T2R2M 587-1638-1-ND Taiyo YudenD100, D200 Red 2 LED, Red, SMD 603 LTST-C190CKT 160-1181-1-ND Lite-On IncD101, D201, D202, Green 4 LED, Green, SMD 603 LTST-C190GKT 160-1183-1-ND Lite-On IncD203LED1, LED2 Amber 2 LED, Amber, SMD 603 LTST-C190AKT 160-1180-1-ND Lite-On Inc
CSTCR4M00G15LQ100, Q200 4Mhz 2 Ceramic Resonator CSTCR 490-7861-1-ND Murata99-R0CSTCR6M00G55-Q400 6 Mhz 1 Ceramic Resonator CSTCR 490-5997-1-ND MurataR0
Cylindrical Can, CMR200T-X1 32.768 kHz 1 Crystal Oscillator 300-8340-1-ND CitizenRadial 32.768KDZF-UTICs
MSP430FR6989PU1 1 Mixed Signal Microcontroller MSP430FR6989 MSP430FR6989 N/A Provided by TI Texas InstrumentsZMSP430F5528IRG MSP430F5528IRGU100, U200 2 Mixed Signal Microcontroller TI_RGC0064B_N 296-27930-1-ND Texas InstrumentsC CR
U400 TPD2E001DRL 1 15-kV ESD-Protection Array DRL0005A TPD2E001DRLR 296-21883-1-ND Texas InstrumentsTUSB2046BIRHBU401 TUSB2046BIRHB 1 4-Port Full-Speed USB Hub RHB0032E 296-21926-1-ND Texas InstrumentsR
3.3-V Buck Step DownU403 TPS62237DRY 1 DRY0006A TPS62237DRYT 296-25630-1-ND Texas InstrumentsRegulatorCONNECTORS
micro-USB Type B, Reverse, CONN_USB_microJ400 micro B 1 ZX62R-B-5P H11574CT-ND HiroseReceptacle, SMD, RA _ZX62R-B-5PATFM-110-02-SM- Contact SamtecRF1, RF2 2×10 SMD 2 Header, SMD, 1.27 mm, 2×10 HDR2X10 N/A SamtecD-A-K directly
Alternative: Anysimilar JP13 and(JP13+JP14), J401 2×2 2 Header, TH, 2.54 mm, 2×2 HDR2X2 67997-104HLF 609-3225-ND FCIJP14 share samecomponent
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Table 3. BOM: Main Board (continued)MANUFACTURERDESIGNATOR VALUE QTY DESCRIPTION PACKAGE DIGIKEY PN REMARK MANUFACTURERPN
J402, J601PORT_1_4, Alternative: AnyPORT_2_3, 2×4 6 Header, TH, 2.54 mm, 2×4 HDR2X4 67997-108HLF 609-3226-ND FCIsimilarPORT_6_8,PORT_J
Shrouded Header, TH, 2.54 mm, SBH11-PBPC- Sullins ConnectorESI 2×8 RA 1 HDR2X8 S9179-ND2×8, Right Angled D08-RA-BK SolutionsAlternative: Any Sullins Connector(Jumpers) 1×2 12 2-pin Jumper, 2.54 mm N/A QPC02SXGN-RC S9337-ND similar Solutions
MISCELLANEOUS4-Way Navigation SwitchBUT TPA511GLFS 1 TPA511GLFS TPA511GLFS 401-1130-1-ND C&Kw/select
BUT (Accessory) Y43109100OP 1 Cap for TPA511GLFS N/A Y43109100OP 401-1997-ND C&KMCU_RESET, B3U-1000P 3 Push Button B3U-1000P B3U-1000P SW1020CT-ND OmronS201, S202
ADKOM ElektronikLCD FH-1152P 1 Custom 160 segment LCD FH-1152P FH-1152P N/A GmbHM3 13 mmM3 Hex Standoff M3/13 mm 4 N/A Harwin Inc 952-1488-ND R30-1011302Female, femaleM3 ScrewPhilips Pan HeadM3 Screw M3/6 mm 4 RM3X8MM 2701 335-1149-ND APM HexsealHead Diameter 5 to 6 mmThread Length 6 mm
Table 4. BOM: Sensor Board (2-LC Configuration)
DESIGNATOR VALUE QTY DESCRIPTION PACKAGE P/N DIGIKEY PN REMARK MANUFACTURERCAPACITORS
Alternatives:Chip Capacitor, C0G, 50 V, GRM1555C1H221C1 C2 C3 220 pF (NP0/C0G) 2 C0402 490-1293-1-ND NP0/C0G, 10 V, Murata±5% JA01D ±5% or betterAlternatives: X5R,Chip Capacitor, X5R, 10 V, GRM155R61A474C5 470 nF 1 C0402 490-3264-1-ND 10 V, ±10% or Murata±10% KE15D better
INDUCTORSL2 L6 L7 470 µH 2 Radial 11R474C 811-2034-ND MurataCONNECTORS
8×2 2.54-mm SFH11-PBPC- Sullins ConnectorESI 8×2 1 S9196-NDFemale Socket D08-ST-BK Solution
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Table 5. BOM: Motor Board
DESIGNATOR VALUE QTY DESCRIPTION PACKAGE P/N DIGIKEY PN REMARK MANUFACTURERRESISTORS
RC0402JR- Alternatives: ±5%R4, R8, R9 100 R 3 Chip Resistor R0402 311-100JRCT-ND Yageo07100RL or betterRC0402JR- Alternatives: ±5%R2, R6 470 R 2 Chip Resistor R0402 311-470JRCT-ND Yageo07470RL or better
Alternatives: ±5%R3 1 K 1 Chip Resistor R0402 RC0402JR-071KL 311-1.0KJRCT-ND Yageoor betterAlternatives: ±5%R5 2 K 1 Chip Resistor R0402 RC0402JR-072KL 311-2.0KJRCT-ND Yageoor better
RC0402JR- Alternatives: ±5%R1 10 K 1 Chip Resistor R0402 311-10KJRCT-ND Yageo0710KL or betterRC0402JR- Alternatives: ±5%R7 47 K 1 Chip Resistor R0402 311-47KJRCT-ND Yageo0747KL or better
Alternatives: Sametype, valueVR1 10 K 1 10-K POT 3352P-1-103LF 3352P-103LF-ND Bourns Inc.between 10 to 100K
CAPACITORSAlternatives: X5R,Chip Capacitor, X7R, 100 V, GRM155R72A222C4 2200 pF 1 C0402 490-6367-1-ND 10 V, ±10% or Murata±10% KA01D betterAlternatives: X5R,C3, C5, C7, C8, Chip Capacitor, X7R, 16 V, GRM155R71C104100 nF 5 C0402 490-3261-1-ND 10 V, ±10% or MurataC10 ±10% KA88D betterAlternatives: X5R,Chip Capacitor, X5R, 10 V, GRM155R61A474C6 470 nF 1 C0402 490-3264-1-ND 10 V, ±10% or Murata±10% KE15D betterAlternatives: X5R,Chip Capicitor, X5R, 16 V, GRM31CR61C226C1, C9 22 µF 2 C1206 490-4739-1-ND 10 V, ±10% or Murata±20% ME15L better
DIODES, LEDsLED1 Red 1 LED, Red, SMD 603 LTST-C190CKT 160-1181-1-ND Lite-On IncLED_PWR Green 1 LED, Green, SMD 603 LTST-C190GKT 160-1183-1-ND Lite-On IncD1 MBR0520L 1 0.5-A Schottky Diode, SMD SOD123 MBR0520L MBR0520LCT-ND FairchildICs, TRANSISTORS
20 TSSOP PW(R- MSP430G2553IPU1 MSP430G2553 1 MCU: MSP430G2553 296-28430-1-ND Texas InstrumentsPDSO-G20) W20DSG(S-PWSON-U3 DRV8837DSG 1 Low Voltage H-Bridge Driver DRV8837DSGR 296-34786-1-ND Texas InstrumentsN8)
U4 QRD1113 1 Reflective Optical Sensor Custom 4L QRD1113 QRD1113-ND Fairchild
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Table 5. BOM: Motor Board (continued)DESIGNATOR VALUE QTY DESCRIPTION PACKAGE P/N DIGIKEY PN REMARK MANUFACTURER
BC817-T1 BC817-40L 1 NPN Transistor SOT23 BC817-40L On Semi40LT3GOSCT-NDJUMPERS, CONNECTORS, SWITCHESBUT1, BUT2 2 SMD push button 6×6 mm B3SL-1002P SW1064CT-ND OmronPOWER 2P2T 1 SMD 2P2T Switch JS202011SCQN 401-2002-1-ND C&K ComponentsPWR_SEL, I2C, Alternative: Any3×1 3 3×1 2.54-mm Pin header 68001-103HLF 609-3468-ND FCIUART similar
Alternative: AnyEXT_PWR, SBW 2×1 2 2×1 2.54-mm Pin header 68001-102HLF 609-3506-ND FCIsimilarAlternative: Any Sullins Connector(Jumpers) 1×2 1 2-pin Jumper, 2.54 mm N/A QPC02SXGN-RC S9337-ND similar Solutions
MISCELLANEOUSNMB TechnologiesMotor 1 Motor PPN7PA12C1 P14355-ND Corporation
BAT 2xAAA 1 2xAAA Battery holder 2468 2468K-ND Keystone ElectronicsCustom made byMotor Mount 1 Custom-made motor mount N/A N/A N/Aoutsourcing
M2 ScrewPhilips Pan Head Alternative: M2Head Diameter 3 mmM2 Screws M2/3 mm 2 N/A Screws with sameHead Height 1 mm dimensionThread Length 3 mmTotal length 4 mmM2 Spring Alternative: Similar B&F FastenerM2 Spring M2/4-mm dia 2 Diameter around 4 mm MLWZ 002 H771-ND M2 Springs SupplyThickness <1 mmM3 ScrewPhilips Pan Head Alternative: SimilarM3 Screw M3/6 mm 5 RM3X8MM 2701 335-1149-ND APM HexsealHead Diameter 5 to 6 mm M3 SpringsThread Length 6 mmM3 1-inch Standoff Alternative: SimilarM3 Hex Standoff M3/2.54 cm 4 R6397-02 952-2177-ND Harwin IncFemale, female M3 StandoffM3 Nut Farnell Alternative:Width around 5 mm 53M8681 (DuratoolM3 Nuts M3 1 N/AThickness around 2 mm M3- HFST-Z100-)(for Mounting Battery Holder) Or Similar M3 Nuts
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8.3 PCB LayoutTo download the layer plots, see the design files at TIDM-3LC-METER-CONV.
8.3.1 Main Board
Figure 12. Main Board 1 Figure 13. Main Board 2
Figure 14. Main Board 3 Figure 15. Main Board 4
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Figure 16. Main Board 5 Figure 17. Main Board 6
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8.3.2 Sensor Board
Figure 18. All Layers Figure 19. Top Silkscreen
Figure 20. Component Side Figure 21. Solder Side
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8.3.3 Motor Board
Figure 22. Motor Board 1 Figure 23. Motor Board 2
Figure 24. Motor Board 3 Figure 25. Motor Board 4
Figure 26. Motor Board 5
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8.4 Altium ProjectTo download the Altium project files, see the design files at TIDM-3LC-METER-CONV.
8.5 Gerber FilesTo download the Gerber files, see the design files at TIDM-3LC-METER-CONV.
9 Software FilesTo download the software files, see the design files at TIDM-3LC-METER-CONV.
10 About the AuthorTHOMAS KOT is a system and solutions architect in the Smart Grid and Energy group at TexasInstruments, where he primarily works on the flow meter reference design development and customersupport. Thomas received his bachelor of engineering in electronic engineering and his master of sciencein electronic and information engineering from Hong Kong Polytechnic University in 1995 and 2005,respectively. He received the master of business administration from City University of Hong Kong in2007.
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