Flow Meter Reference Design - NXP
Flow Meter Reference DesignDocument Number: DRM138Rev. 0, 12/2012
Flow Meter Reference Design, Rev. 0, 12/20122Freescale Semiconductor, Inc.
ContentsSection numberTitlePageChapter 1Introduction1.1 Introduction to flow meter reference design.51.2 Application features and components .61.3 Freescale controller: advantages and features .6Chapter 2Metering Theory and Configurations2.1 Basics of flow meter.92.2 Flow calculations.10Chapter 3Hardware Design3.1 Block diagram.113.2 Power supply.123.3 Display interface.123.4 Flow sensor interface.133.5 User pin interface.143.6 Communication port.143.7 Background Debug mode (BDM).153.8 Microcontroller requirements.173.8.1 Crystal requirements.173.8.2 LCD requirements .173.9 Assembled printed circuit board.18Chapter 4Software Design4.1 Introduction.194.2 Block diagram .194.3 Data flow diagram.204.4 Hardware resource allocation .21Flow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.3
Section numberTitlePage4.5 Flow Calculation.224.5.1 Overview .224.5.2 Measurement parameters .224.5.3 PCNT Module.224.5.3.1 Summary of key features.224.5.3.2 Initialization sequence.234.5.3.3 Pseudo-Code for PCNT initialization.234.5.4 Calculation and accumulation process.244.6 Database.244.6.1 Overview.244.6.2 Block diagram .244.6.3 Implementation .254.7 User Interface .254.7.1 Overview.254.7.2 Block diagram .264.7.3 Implementation.264.8 Communication .264.8.1 Overview.264.8.2 Block diagram.274.8.3 Implementation.27Flow Meter Reference Design, Rev. 0, 12/20124Freescale Semiconductor, Inc.
Chapter 1Introduction1.1 Introduction to flow meter reference designFlow meter based on MC9S08GW64 is a low-cost, low-power system. This referencedesign is specifically targeted for gas and fluid meters. This design fulfils the basicmarket requirement for the Flow meter: low-power, low-cost, able to run on battery, andwith automated meter reading (AMR).The main attraction of this design is that the flow sensing module of the MCU keepsrunning even when the MCU goes into low-power mode. Since the MCU is in low-powermode for most of the time, it reduces the power consumption.Figure 1-1. Block diagramFlow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.5
Application features and componentsThis meter supports a battery driven power supply and is capable of time keeping. Itsenses the signals from the flow sensor, calculates the flow and then accumulates it. Thetotal flow accumulated and the monthwise profile of the flow are stored and updated inthe memory. The user key available on the board can be used to display the flowaccumulated in a month and the date on the LCD.The design also supports wireless communication with another handheld device usingZigBee . Thus, the device supports the AMR where a user can derive the flow readingsusing a handheld device from a distance.This document describes the design of a flow meter reference design based on Freescale'sMC9S08GW64 microcontroller specifically targeted for flow metering applications. Thisdesign is targeted at consumer and industrial applications.1.2 Application features and componentsThe reference design is based on MC9S08GW64 microcontroller and has the followingfeatures: Operating voltage 3.3 V and frequency 4 MHz Based on Hall Effect sensor RF communication over ZigBee Battery driven power supply, capable of running more than 10 years Measurement and storage of the total flow accumulated as well as the monthlyprofile of flow LCD display of the flow accumulated in a month User switch (SW2) available on the design for the LCD display (display turns offautomatically after a few seconds to save power) Inbuilt hardware to detect box-open tamper even in case of power failureThe following items are supplied for developing the energy meter using theMC9S08GW64 microcontroller: Reference energy meter Software—Design document, source code Documentation—DRM, BOM, schematics1.3 Freescale controller: advantages and featuresThe advantages of using MC9S08GW64 include: Extremely low-power consumption since the CPU stays in low-power mode inbetween the calculations Ultra–low-power independent RTC with calendar featuresFlow Meter Reference Design, Rev. 0, 12/20126Freescale Semiconductor, Inc.
Chapter 1 Introduction Inbuilt LCD driver Inbuilt position counter (PCNT) that keeps working even in the low-power mode andis used to calculate the flow and to send interrupts for MCU wakeup Tamper pin used as a user interface to scroll through the display options Standby RAM of the IRTC used to update the flow on every interrupt Flash used for EEPROM emulation to store the flow accumulated and other dataFigure 1-2. Reference design for flow meterThe features of the Freescale's MC9S08GW64 MCU include: 20 MHz 8-bit S08 MCU Up to 288 segments (1 .8x43 .36) of LCD and can be interfaced. Flexiblefrontplane/backplane pin assignments AMR SPI and SCI, 5 V tolerant master/slave SPI and SCI 2 separate tampers Operating temperatures: –40 C to 85 C, 80/64 pin Inbuilt battery operated IRTCFlow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.7
Freescale controller: advantages and featuresFlow Meter Reference Design, Rev. 0, 12/20128Freescale Semiconductor, Inc.
Chapter 2Metering Theory and Configurations2.1 Basics of flow meterFigure 2-1. Block diagram of basic flow meterFigure 2-1 shows the flow meter concept block diagram. The flow sensor is used to sensethe flow of the gas or fluid. It generates pulses according to the flow sensed. These pulsesare counted using a counter and then based on the number of pulses encountered in aparticular time, the flow is calculated, accumulated, and stored. A flow meter is a device that measures the rate of flow and the flow accumulatedover the time.Flow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.9
Flow calculations It can be used for measuring the flow of gas or fluid supplied for residence, factory,agriculture, and so on. The unit for the measurement of flow is liter2.2 Flow calculationsThe flow calculation is done with the help of PCNT (position counter) module. It keepson counting the pulses generated by the flow sensor. The overflow generates the interruptto the MCU. The flow calculations in this reference design are done on a linear flowsensor.Suppose the sensor generates ‘x’ pulses per second (pps) when the fluid flows at a rate of‘y’ liters/minute. The flow is calculated as follows:‘y’ liters/minute ‘x’ pulses per second ‘x’*60 pulses per minuteThus, if ‘x’ * 60 pulses are counted then flow accumulated ‘y’ liters Suppose ‘n’ pulsesleads to the overflow of the PCNT thenFlow accumulated when due to ‘n’ pulses {‘y’/ (60* ‘x’)}* ‘n’Flow Meter Reference Design, Rev. 0, 12/201210Freescale Semiconductor, Inc.
Chapter 3Hardware Design3.1 Block diagramThe block diagram below gives the overview of flow meter based on MC9S08GW64.Figure 3-1. Flow meter reference design block diagramFlow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.11
Power supply3.2 Power supplyThe power is supplied using batteries as shown in the diagram below. Using the switch(SW1) the power can be switched on or off.Figure 3-2. Power supply schematic3.3 Display interfaceLCD (Liquid Crystal Display)LCD used for display is a flow meter specific as shown in the figure below:Flow Meter Reference Design, Rev. 0, 12/201212Freescale Semiconductor, Inc.
Chapter 3 Hardware DesignFigure 3-3. Front view of LCD Viewing angle — 6:00 o'clockDisplay m — positive/ reflective/ in typeDriving voltage — 3.0 V, Duty —1/4, Bias — 1/3Operating temperature — 20 C to 70 CStorage temperature — –25 C to 75 CPolarizer: Transmissive / Positive (UV)Display Type: TNThe glass uses four pins as backplane and 20 pins as front plane. This has 4 x 20 (80)segments in all. The flow and date can be displayed on this LCD.3.4 Flow sensor interfaceThe interface between the reference meter and the flow sensor is shown in the figurebelow:Flow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.13
User pin interfaceFigure 3-4. Flow sensor interface diagram The pulse output from the flow sensor should be connected to the "PCNT2" (PCNT0and PCNT1 pins are not used but kept for connectivity for up to 3 bit binary or greycoded sensors). The power supply and ground can be provided to the flow sensor using the pins 1 and7 of the jumper J9 as shown in Figure 3-4.3.5 User pin interfaceThere is one push button on the reference meter which displays the flow and date on theLCD alternatively.3.6 Communication portThe meter can communicate with the ZigBee trans-receiver available on the referencedesign.Flow Meter Reference Design, Rev. 0, 12/201214Freescale Semiconductor, Inc.
Chapter 3 Hardware DesignFigure 3-5. Schematic of ZigBee trans-receiver on the reference design Wireless (ZigBee) communication – data exchange for flow meter parameters ZigBee communication complied with IEEE 802.15.4 standard for data exchange3.7 Background Debug mode (BDM) The BDM communication interface is used basically for programming the controller The non-isolated BDM port is connected directly to the controllerFlow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.15
Background Debug mode (BDM)Figure 3-6. Photograph of PE micro USB multilink PE’s USB multilink is a debug interface that allows a PC to access the background BDM on controller MC9S08GW64 It connects between a USB port on a windows machine and the standard 6 pin bergdebug connector on the target The user can take advantage of the BDM to halt normal processor execution and usea PC to control the controller The user can then directly control the target’s execution, read/write registers andmemory values, debug code on the controller, and program internal or externalFLASH memory devicesFlow Meter Reference Design, Rev. 0, 12/201216Freescale Semiconductor, Inc.
Chapter 3 Hardware DesignFigure 3-7. Circuit of BDM 6-pin connector3.8 Microcontroller requirements3.8.1 Crystal requirementsThe external 32.768 kHz is a crystal used for the RTC, the same clock is multiplied bythe FLL which is internal to the controller to provide clock to core, bus, and peripherals.3.8.2 LCD requirementsThe LCD driver of the controller requires three ceramic capacitors whose typical value is0.1 μF for LCD bias voltages and a 0.1 μF ceramic capacitor for the LCD charge pump.Flow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.17
Assembled printed circuit board3.9 Assembled printed circuit boardFigure 3-8. Assembled boardFlow Meter Reference Design, Rev. 0, 12/201218Freescale Semiconductor, Inc.
Chapter 4Software Design4.1 IntroductionThis section describes the software design for the flow meter application. The softwaredesign consists mainly of the flow calculation, database, user interface, andcommunication modules. This chapter aims to explain the software design. The softwarearchitecture is a custom kernel running on an MC9S08GW64 controller. The controlleruses the external RTC clock source and internal FLL to generate the system clock ofapproximately 2 MHz.The software has following main modules: Flow Calculation Module Database Management Module User Interface Module Communication Module4.2 Block diagramThe following figure shows the block diagram of MC9S08GW64-based flow metersoftware:Flow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.19
Data flow diagramFigure 4-1. Block diagram of software architecture4.3 Data flow diagramThe following figure shows the data flow diagram of MC9S08GW64-based flow metersoftware architectureFlow Meter Reference Design, Rev. 0, 12/201220Freescale Semiconductor, Inc.
Chapter 4 Software DesignFigure 4-2. Data flow diagram4.4 Hardware resource allocationTable 4-1. Hardware Resource AllocationMC9S08GW64 inbuilt blockDescriptionPCNTUsed to count the sensor output pulses and calculate the flowFlashUsed to store the flowTimer (MTIM1)Used for interrupt generation to switch off the LCD after fewsecondsLCDUsed to drive the LCD screen to display the flow on LCDscreenSPIUsed to communicate with ZigBee hardwareIRTCUsed for time keepingTamperUsed as a user switchFlow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.21
Flow Calculation4.5 Flow Calculation4.5.1 OverviewThe Flow Calculation Module of the Freescale's Reference Flow Meter performs thefollowing functions:1. PCNT module counts the pulses from the flow sensor output.2. Sends an interrupt to the MCU on PCNT overflow.3. Computes the flow for the interval.4. Accumulates the flow in a variable.4.5.2 Measurement parametersThe following are the measurable parameters of MC9S08GW64-based Reference FlowMeter design. Accumulated flow for the entire interval when the meter is running Current month’s flow Date and time4.5.3 PCNT ModulePCNT or position counter is a low-power pulse sequence counter. Once configured, it iscapable of working independent of the CPU in stop3 or stop4 modes. The PCounteraccumulates the valid pulses input to it. The PCounter interfaces to various rotatorysensors that provide it with necessary pulse sequence to determine the flow direction andquantity of the flow.4.5.3.1 Summary of key features Supports interfacing to one-, two- or three-pin rotatory sensor. Supports 180 degree, Gray and Binary Decoding mode. Two-Signal Gray mode isalso called as Quadrature mode. Able to filter sensor signals with programmable filter width. Able to detect and generate interrupts on an invalid sequence. Generates interrupts on counter overflow. Generates required signaling to activate sensors. Generates asynchronous interrupt to wake MCU from low-power modes.Flow Meter Reference Design, Rev. 0, 12/201222Freescale Semiconductor, Inc.
Chapter 4 Software Design Able to function independently in Stop mode.Modulus registers to interrupt CPU on specific count or full count.Able to function as limited capability PWM (that is, edge- or centre-aligned PWM).Internal counter can function as an atomic counter which increments on each IPSwrites and generates an interrupt on counter overflow.4.5.3.2 Initialization sequenceBefore the PCNT module can be used to count pulses, an initialization procedure must beperformed. A typical sequence is as follows: Enable clock to PCNT module. Program PCNT PWM MOD, PCNT PWM CH1 VAL andPCNT PWM CH2 VAL registers for proper generation of sensor activation signaland sampling signal or PWM signals. Program the PCNT CTRL register with the required filter value, interrupt enablers,PWM mode, and channel selection with PCNT EN 1’b1. PCNT PWM MOD, PCNT PWM CH1 and PCNT PWM CH2 get locked whenthe PCNT EN bit of PCNT CTRL is asserted. Users are not able to update theseregisters till PCNT EN 1’b1.4.5.3.3 Pseudo-Code for PCNT initializationIn this example, the PCNT module is set up to perform a single 16-bit conversion atnormal power with a long sample time on input channel 1, where the internal ADCKclock is derived from the bus clock divided by 1.PCNT CTRL 0x2400 (0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0)Bit 15 SINVIE 0 State invalid event does not generate an interrupt.Bit 14 RCOVFIE 0 RCounter overflow event does not generate an interrupt.Bit 13 FCOVFIE 1 FCounter overflow event generates an interrupt.Bit 12-11 MODE 00 PCounter operates in binary mode.Bit 10-8 CHANNEL SEL 100 Selects PCNT Channel 2.Bit 7 PCNT EN 0 PCounter is disabled.Bit 6 DIR 0 Direction bit.Bit 5 POL 0 Low-true pulses (set output on compare-up) on Ch1 and Ch2.Bit 4 CPWMS 0 Ch1 and Ch2 operate as a edge-aligned PWM.Bit 3-0 FILTER VALUE 0000 Filtering operation disabled.Flow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.23
DatabasePCNT FCMOD H 0x00 (0 0 0 0 0 0 0 0)PCNT FCMOD L 0xFF (1 1 1 1 1 1 1 1)The PCNT FCMOD modulo register contains the modulo value for the FCounter.After the FCounter reaches the modulo value, it resumes counting from 0x0000,and the overflow flag FCOVF of PCNT STATUS becomes set.PCNT CTRL PCNT EN 1 To enable the PCNT module4.5.4 Calculation and accumulation processThe position counter keeps on counting the pulses and when the counter overflows, aninterrupt is generated that wakes up the MCU and it calculates the amount of fluid thathas flown in the time interval. The flow calculated in the given interval is accumulated inthe variables.4.6 Database4.6.1 Overview Reference Flow Meter design has flash memory inside the MCU Flash memory storage parameters Monthwise Accumulated Flow Accumulated Flow Month and Month’s flow when the LVD occursFlow Meter Reference Design, Rev. 0, 12/201224Freescale Semiconductor, Inc.
Chapter 4 Software Design4.6.2 Block diagramFigure 4-3. Database block diagram4.6.3 Implementation IRTC is used for time keeping and it generates an interrupt when a month expires. As soon as a month is over, the flow accumulated in that month is updated and storedin the flash memory using the flash driver. The monthwise flow keeps on updating in the flash and at any time the monthwiseprofile of the flow can be retrieved from the flash using flash driver. On occurrence of LVD (Low Voltage Detect), the flash is updated with the month,flow in that month, and the flow accumulated till date.4.7 User Interface4.7.1 Overview The User Interface Module comprises LCD, User switch, and its respective drivers. Custom LCD specific for flow metering application Meter has a user key to display the date and the current month’s flowFlow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.25
Communication4.7.2 Block diagramFigure 4-4. User Interface block diagram4.7.3 ImplementationLCD Flow accumulated in the current month and the date are displayed alternately The LCD goes off after a few seconds of display When the LVD (Low Voltage Detect) occurs then the LCD displays “OFF” as anindicatorKey User key is available to enable the LCD and display the parameters (Flow and Date)4.8 Communication4.8.1 Overview Meter shall facilitate wireless communication over ZigBee with external worldFlow Meter Reference Design, Rev. 0, 12/201226Freescale Semiconductor, Inc.
Chapter 4 Software Design On other side, a handheld unit supporting ZigBee shall be used for communicationpurpose. Transmission and reception by interrupt method.4.8.2 Block diagramFigure 4-5. Communication block diagram4.8.3 ImplementationZigBee interface IEEE 802.15.4 standard used for data exchange A RF antenna is used for the interface between the meter and the handheld deviceconnected to PC for communication Transmission and reception is on interrupt based. Reception is disabled until thereceived packet is processed. MCU uses SPI interface to communicate with the ZigBee hardware The block diagram below explains the flow of ZigBee communicationFlow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.27
CommunicationFigure 4-6. ZigBee communication diagramFlow Meter Reference Design, Rev. 0, 12/201228Freescale Semiconductor, Inc.
Appendix ASchematic and LayoutA.1 SchematicFigure A-1. SchematicA.2 LayoutA.2.1 Silkscreen topFlow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.29
Figure A-2. Silkscreen – topFlow Meter Reference Design, Rev. 0, 12/201230Freescale Semiconductor, Inc.
Appendix A Schematic and LayoutFigure A-3. Silkscreen – bottomFlow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.31
Figure A-4. Layout – topFlow Meter Reference Design, Rev. 0, 12/201232Freescale Semiconductor, Inc.
Figure A-5. Layout – bottomFlow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.33
Flow Meter Reference Design, Rev. 0, 12/201234Freescale Semiconductor, Inc.
Appendix BBill of MaterialItemQuantityAgile PNASSY OPTReferenceValueDescriptionASSY NO Mfg nameTEMfg partnumber11510-75678ANT1F Antenna PCB FANTENNA,NO PARTORDERNO PARTTOORDERNOT APART23280-76468BH1,BH2,BH3MOUNTIN MOUNTING HOLEG HOLEDRILL 108PAD 140PLATEDTH NOPART TOORDERNO PARTTOORDERMountingHole - 108mil DrillPTH31801-75636BT1BATTERY BATTERYHOLDER HOLDER2XAA THKEYSTON 2462EELECTRONICS49150-75599C1,C2,C3, 0.1 μFC4,C5,C9,C21,C22,C23CAP CER0.1 μF 25V 10%X7R 0805PANASON ECJ-2VB1IC-ECGE104K55150-78252C6,C11,C1 0.1 μF3,C14,C15CAP CER0.1μF 16 V10% X7R0805Panasonic ECJ2VB1C104K61150-75055C710 μFCAP TANT10 μF 16 V10% -3216-18AVXTAJA106K016R72150-75202C8,C1022 pFCAP CER22 pF 50 V5% C0G0805KEMETC0805C220J5GAC81150-30310C121.0 μFCAP TANT1.0 μF 16V 20% -3216-18KEMETT491A105M016ATTable continues on the next page.Flow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.35
ItemQuantityAgile PNASSY OPTReferenceValueDescriptionASSY NO Mfg nameTEMfg partnumber91150-77934C161 pFCAP CER1 pF 50 V10% C0G0603TDKC1608C0GCORPORA 1H010BTION (VA)V102150-30054C17,C196.8 pFCAP CER6.8 pF 50V /- 0.25pF C0G0603MURATA GRM1885ELECTRO C1H6R8CNICS (VA) Z01DV111150- 30248C1810 pFCAPCERAMIC10 pF 50 VNP0 0603YAGEO(VA) V121TMPWF1378 0DS1DP701 3LCD glass3 V 24 pinsDeepakshi DP7013displays131210- 75726J1HDR TH1X3HDR 1X3TH 100 milSP 339HAU 118LSAMTECTSW-10307-G-S143210- 75439J2,J3,J7HDR 1X2THHDR 1X2TH 100 milSP 335HAU 95LSAMTECTSW-10207-G-S152210- 77295J4,J10HDR 2X3HDR 2X3TH 2.54MM SP340H AU118LHARWININCM209980345161210- 77872J5CON SMA CON 1COAX SKTSMA TH120 milLEADS -AUJOHNSON 142-0761COMPON 811E NTS INC171210- 75541J9HDR 2X4 HDR 2x4TH 100 milCTR 330 HAU 100 lSAMTECTSW-10407-S-D181180- 77438L12.2 μHIND -- 2.2μH@7.96MHz 200 MA5% SMTTDKNLV25T2R2J-PF192180- 76197L2,L51.8 NHIND -1.8NH @100 MHz300MA0.3NH0603TAIYOYUDENHK16081N8 S-TCC0603JRNP09BN100Table continues on the next page.Flow Meter Reference Design, Rev. 0, 12/201236Freescale Semiconductor, Inc.
Appendix B Bill of MaterialItemQuantityAgile PN202180- 77416211470- 7544222723ASSY OPTReferenceValueDescriptionASSY NO Mfg nameTEMfg partnumberL3,L43.9 NHIND -3.9NH@100MHZ300MA0.3NH0603TAIYOYUDENHK16083N9 S-TR10RES MFZEROOHM 1/8W-- 0805YAGEOAMERICARC0805JR- 070RL470- 75442R2,R3,R5, 0R17,R18,R32,R33RES MFZEROOHM 1/8W-- 0805YAGEOAMERICARC0805JR- 070RL1470- 78687R410 MRES MF10.0M1/8W 1%0805YAGEOAMERICARC0805FR- 0710ML241470- 80195R66.2 MRES MF6.2M 1/8W5% 0805PANASON ERJ6GEYJIC62 5 V252470- 76111R7,R140 ohmRES 0.0OHM 1/8W5% 0805SMDYAGEO(VA) VRC0805JR- 070RL262470- 75904R8,R1010KRES MF10K 1/8W5% 0805YageoRC0805JR- 0710KL276470- 75908R11,R13,R 4.7K15,R16,R34,R35RES MF4.7K 1/8W5% 0805YageoRC0805JR- 074K7L2810470-76111R12,R19,R 0 ohm20,R21,R22,R23,R24,R25,R26,R27RES 0.0OHM 1/8W5% 0805SMDYAGEO(VA) VRC0805JR-070RL294470-75904R28,R29,R 10K30,R31RES MF10K 1/8W5% 6 NSW SPDTSLD 125 V4A THAPEMCOMPONENTS25136NAH312510-75922SW2,SW3 PTS645SW SPSTMOM NOPB 12 V50MA SMTITTCANNONPTS645SL50SMTRLFSDN PDN PTable continues on the next page.Flow Meter Reference Design, Rev. 0, 12/2012Freescale Semiconductor, Inc.37
ItemQuantityAgile PNASSY OPTReferenceValueDescriptionASSY NO Mfg nameTETESTPOINTPAD 35 milSMT, NOPART TOORDERNAMfg partnumber326280-75148TP1,TP2,T TESTP3,TP4,TP POINT5,TP6NA331TMPWF-11879U1MC9S08G IC MCU 8W64bit 3 VLQFP 80Freescale MC9S08LSemicondu GW64ctor341312-76396U2MC13202F IC XCVRC2.4 GHz2/3.4 VQFN32FREESCA MC13202FLECSEMICONDUCTOR351230-77671Y132.768 kHz XTAL32.768 kHzRSN -SMTAbraconAB26TRBCorporatio 32.768 kHzn361230-75677Y216 MHzXTAL16MHZFIXED -SMT3.2X2.5MMNDK371560-75093Z12400 MHz50 ohmXFMRBALUN2400 /-100MHz SMTNX3225SA-16.000000MHzFlow Meter Reference Design, Rev. 0, 12/201238Freescale Semiconductor, Inc.
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Software Design 4.1 Introduction This section describes the software design for the flow meter application. The software design consists mainly of the flow calculation, database, user interface, and communication modules. This chapter aims to explain the software design. The software arc
packages assembled at NXP and NXP's assembly and test vendors. Refer to Section Downloading package information from NXP website of this application note for step by step instructions for retrieving package information. For more details about NXP products, visit www.nxp.com or contact the appropriate product application team.
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The flow meter consists of two parts: 1. Flow meter body: The flow meter body contains an analog dial for manual readings as follows. Your flow meter will have 3 wires protruding from the body. The wires need to be connected to the sensor inputs on the controller for readings in the software application.
