MicroLoop Service Manual
Contents
1. TOX 5 LI 8 1 9 gt 58020280 quwiq WTNH ESN 9 a 21 90 221 QUIN L ds EN elo a GT GB y lt Ha FA aun IE 23 coor 4 Er lt A 1 Fa SS E10 2 ET j MOOT HE LER UND UND UND lor Tey Toa Bar ee LAL yun anto lt L ROR iva NOW TYE 1 q SSA 7 T gin ho alll Ls Nee AGELVE DET grano sel t si HTA Si 0001832 Ne El 8 g T 91004 91 7 00016 7 ria OWL Es AWA DOA AOI 60 DIAS A91 ANSE AE 142 9 O ar T 0001S3HZ ta E1 Q INIGA AOI 670 DIAS 8 T mee TSEOINSOMDI2. 1 0805 package 10K resistor 1 0805 package 10K resistor 1 0805 package 100K resistor 1 0805 package 100K resistor 1 0805 package 10K resistor 1 0805 package 10K resistor 1 0805 package 100K resistor 1 0805 package 100K resistor 1 0805 package 10 ohm resistor 1 0805 package 1K resistor 1 0805 package 150K resistor 1 0805 package 68K resistor 1 0805 package 91K resistor 1 0805 package 100 ohm resistor 1 0805 package Parts List For MicroLoop MK6 Drawing No 06700 Dale 42 07 02 Revision No 15 Designation Part No R27 82K resistor 1 0805 package R28 OOK resistor 1 0805 package R29 39K resistor 1 0805 package R30 13K resistor 1 0805 package R31 100K resistor 1 0805 package R32 337 729 F 82 ohm 1 watt resistor axial package R33 100K resistor 1 0805 package R34 100K resistor 1 0805 package R35 10K resistor 1 0805 package R36 10K resistor 1 0805 package R37 1K resistor 1 0805 package R38 1K resistor 1 0805 package RN1 107 048 F 6 pin 5 commoned 100K SIL network R1 18 S I S B S T 20 Piher 20K linear potentiometer C1 2pF Philips or AVX ceramic 0805 package C2 47pF Philips or AVX ceramic 0805 package 1nF Philips or AVX ceramic 0805 package C4 1nF Philips or AVX ceramic 0805 package C5 100nF Philips or AVX ceramic X7R dielectric 0805 package C6 100nF Philips or AVX ceramic X7R dielectric 0805 package C7 100nF Philips or AVX ceramic X7R dielectric 0805 package C
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4. 8 100nF Philips or AVX ceramic X7R dielectric 0805 package c9 100nF Philips or AVX ceramic X7R dielectric 0805 package C10 197 324 F 47uF 16v Surface mount Tantalum C11 100nF Philips or AVX ceramic X7R dielectric 0805 package C12 100nF Philips or AVX ceramic X7R dielectric 0805 package C13 100nF Philips or AVX ceramic X7R dielectric 0805 package C14 100nF Philips or AVX ceramic X7R dielectric 0805 package C15 100nF Philips or AVX ceramic X7R dielectric 0805 package C16 100nF Philips or AVX ceramic X7R dielectric 0805 package C17 33pF Philips or AVX ceramic X7R dielectric 0805 package C18 100nF Philips or AVX ceramic X7R dielectric 0805 package C19 33pF Philips or AVX ceramic X7R dielectric 0805 package C20 100nF Philips or AVX ceramic X7R dielectric 0805 package C21 100nF Philips or AVX ceramic X7R dielectric 0805 package C22 1uF Philips or AVX ceramic X7R dielectric 0805 package C23 197 324 F 47uF 16v Surface mount Tantalum 024 1uF Philips or AVX ceramic X7R dielectric 0805 package C25 100nF Philips or AVX ceramic 0805 package C26 301 8544 F 33uF 16v Surface mount Tantalum C27 301 8544 F 33uF 16v Surface mount Tantalum 028 301 8544 F 33uF 16v Surface mount Tantalum 029 100nF Philips or AVX ceramic 0805 package 100nF Philips or AVX ceramic 0805 package C31 301 7000 F 100uF 16v C32 100nF Philips or AVX ceramic 0805 package 301 8593 47uF 25v Surface mount Tantalum C34 301 8544 F 33uF 16
5. MicroLoop Service Manual 067 17 Revision 1 0 November 2002 Micro Medical Limited P O Box 6 Rochester Kent ME1 2AZ MicroLoop System Overview Fig 1 The Micro Medical MicroLoop is a data recording spirometer consisting of a microcomputer unit 1 incorporating an LCD graphic display data entry keypad RS232 serial interface and all associated circuitry This is supplied with a digital volume transducer 2 disposable mouthpieces transducer holder 3 and mains adapter 4 The MicroLoop is powered by internal rechargeable Nickel Cadmium cells or by the mains adapter supplied 4 When testing a subject the transducer is inserted into the holder which is plugged into the microcomputer unit The digital volume transducer is used to measure the subjects expired flow and volume in accordance with the operating manual ooo ooo ooo ooo ooo 1 3 55 Ey Q 2 3 2 24 N N 5 f id TE nnn 11 A id a Transducer Fig 2 The Micro Medical digital volume transducer consists of an acrylic tube with a vane positioned between two swirl plates The low inertia vane is atta
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8. SOT 23 package oshiba 1A diode etex Schottky diode SOT 23 package 3 3UH inductor 1210 package 3 3UH inductor 1210 package 2uH inductor 1210 package 2uH inductor 1210 package 2uH inductor 1210 package 2uH inductor 1210 package yco 700mA Polyswitch Nan Ya 240 X 160 graphic display Molex 6 way data socket 18 way 1mm pitch cable connector from JST 4 way mini DIN socket 14 way 1mm pitch cable connector from JST way 0 1 pitch pin header 5mm DC power socket from G English 3 way 0 1 pitch pin header way PCB socket from JST Murata piezo ceramic sounder 32 768 KHz crystal WATCH package OMHz crystal HC49 4H package 10 crystal Sanyo NI CAD battery pack M1 7 X 3mm screw M1 7 plain washer 14 way ribbon cable for keypad PCB Iss 1 8 L 5 5 A YOS LOLI INAH JO Pous 00 9 01 10 190 Ed aas MAMAO PMAN 00070101 INL Ed AV1dSIC SOU 505025 opnu 8 amp cl 8 L s 5 E z 58000840 WS ZO LI
9. ched to a stainless steel pivot which is free to rotate on two jewelled bearings mounted at the centre of the swirl plates As air is passed through the transducer a vortex is created by the swirl plates which causes the vane to rotate in a direction dependant upon the direction of air flow The number of rotations is proportional to the volume of air passed through the transducer and the frequency of rotation is proportional to the flow rate The transducer housing consists of a main body which contains a pair of light emitting diodes LED s and phototransistors The transducer is fixed to the mouthpiece holder which pushes into the main body and is captured by an O ring seal The LED s produce infra red beams which are interrupted by the vane twice per revolution This interruption is sensed by the phototransistors The output from the collector of each phototransistor will be a square wave with a phase difference between the two of or 90 degrees depending upon the direction of flow There is no routine maintenance required for the transducer other than cleaning according to the instructions in the operating manual Micro Medical Digital Volume Transducer Rotating Infrared Swirl Jewelled vane emitter plate bearing Si H N al 1 Tp gt Z 2 N ve ll f o HR Te tA 1 pan E
10. e gt IA 2012 y Va L S AF S H Infra red detector k X No of pulses 4 Volume proportional to the number of pulses Flow proportional to the puse frequency UL m m Flow k pulse period Microcomputer Unit Refer to drawings 067 01 067 05 067 11 and 067 12 The microprocessor control circuit carries out the spirometry routines monitors the transducer pulses and keypad and drives the display under the control of the program module The drawing 067 01 is a hierarchical block diagram showing the connections of the sub sections The rest of the drawings are sub sections and are described in detail below Micro controller 067 02 U9 is a Hitachi HD64F2318 16 bit microprocessor with 256K of flash memory and 8K of Ram The system clock is supplied by 20MHz crystal X2 There is also 512 Kbyte U7 of external Ram used for running a module and storing variable data The internal flash is used for the boot software kernel and the base module The kernel handles the low level interface to display keyboard etc and the base module runs on start up and gives a choice of which module needs to be executed The modules are stored in the external 8 Mbyte Flash PROM U5 The kernel also has a flash filing system which keeps track of all the files in the external Flash PROM The files can be an executable module or spirometry or other module data The filing sy
11. e is ever replaced the unit will have to be reconfigured and recalibrated Temperature Sensor U20 is a Dallas 0518520 temperature sensor operating on their one wire bus protocol It has an accuracy of 0 5 degree centigrade A port line P23 is used under software to emulate the one wire bus The ambient temperature reading is used for adjusting inspiratory flow at ambient temperature to respective flow at body temperature Transducer interface 067 05 The supply to the two series LEDs inside the transducer housing is provided through TR1 which is switched on or off by TR2 This is controlled by port pin P26 of the processor and is only turned on during a spirometry manoeuvre to conserve power However power is supplied to the transducer through D1 continuously when the mains adapter is connected The same line is used for powering the Rint transducer and it helps to have it on to charge the transducer battery Inside the transducer housing the two phototransistors used to detect the interrupted infra red beam are in open collector configuration The collectors are connected to pins 2 and 3 of SK2 The pull up resistor for the two phototransistors is provided by R1 and R2 The signal from the phototransistor is applied to the pulse timing input of the processor P16 after being squared up by the action of the Schmitt inverters U1 The signal from the second phototransistor after conditioning U2 is applied to a D type latch and a clock by t
12. ernal 9V DC regulated power supply If the external supply is connected then is switched off and the battery is not used R32 ensures that the battery is trickle charged at all times The on off key is conditioned via U12 and applied to set reset D type flip flop U11 On every key press the flip flop toggles between the on and off state In the On state TR7 is switched on switching on TR6 The on state can be held by MC_ON line from the uC whilst it is saving data in the Flash PROM The uC can also switch the power off by means of the MC_OFF line which resets U11 U14 is a DC DC converter with an input range of 0 9V to 10V and an output of 3 3 volts to power the unit Since the range is up to 10V only care should be taken not to use any other external power supply as most of them are unregulated and could output 12V for a 9V unregulated supply U14 is another DC DC converter with an output of 9V This higher supply is used for powering the sensor LEDs and also to power the Rint transducer R28 and R31 divide the unregulated voltage to a third and are applied to the A D converter of the uC The uC continuously examines the reading and gives a battery low or battery dead warning message From the reading the uC can also deduce that the external supply is connected so it can turn itself off if the unit is left on for a long time Inductors L1 and L2 are placed for EMC filtering and D5 protects the unit from reverse polarity power s
13. he first phototransistor to determine the direction of the turbine The direction signal is fed to uC via port P17 The rising edge of the signal applied to P16 causes an interrupt to be generated in the processor This interrupt is processed by incrementing a pulse count timing the period since the last pulse and by reading the state of P17 The pulse count is used to determine the volume passed through the transducer since the start of the test and the pulse period is used to determine the flow at each volume increment Display 067 11 The display is a high resolution custom graphic 240 by 120 dot LCD It is controlled by an Epson SED1335 display controller U16 which directly interface to the uC The display controller timing is generated by a 10 MHz crystal X3 U19 is a 32K byte RAM to hold the display data The LCD display is based on four planes each requiring different plane voltage It is biased by 22 V generated by DC DC controller U17 VR1 varies this voltage which in turn changes the contrast At dark level the bias voltage is typically 22 6V and the plane voltages are 20 9V 19 2V 3 5V and 1 7V Of course they would be slightly different for different contrast level The plane voltages are generated by resistor ratio dividers R12 R13 R25 R14 R17 and buffered by quad Op amps U18 J2 is a connector to the display Power Supply 067 12 The power to the system is either supplied by the 3 9V lithium battery or from an ext
14. stem is similar to the old PC Dos filing system U15 is just used to control the access to the flash device The speaker J5 is directly connected to the Port pins and the pins are toggled at 1 KHz to generate the buzzing sound U9 is used for enabling the internal flash to be overwritten If a new kernel is downloaded the flash is enabled and data transferred U10 is the reset controller which holds the reset line low for 350 ms on power up This ensures that the supply has stabilised before the micro starts TR3 is used by the micro to hold the power supply ON whilst it is writing to the filing system This is to ensure that data is not corrupted when it is writing and the power is turned off TR4 allows the micro to turn off the power and switch off the unit This is normally done when the unit is left on for a long period of time To preserve the battery it turns it off Memory Map OXOOOOOO 0 040000 256K Internal Flash 0x400000 0 480000 512K External Ram for modules 0x800000 Flash Prom Single address used 0xC00000 Display Controller OxFFDCOO OxFFFBFF 8K Internal Ram stack Keypad interface 067 03 The 26 keypad switches are arranged in a 5 X 5 matrix and a separate On Off key When the keypad is being read by the processor the 5 columns are sequentially driven low by the port lines PEO PE4 The state of the 5 rows is read by the port P40 P44 The diodes in the keypad PCB isolate the outputs from
15. the Port to ensure that a high current will not flow from an output set high to one set low if two keys are pressed simultaneously The ON OFF key is connected to the power control circuitry described in the Power Supply section Resistor RN1 ensures that the keys which are not pressed are read as high Serial interface 067 04 The uC communicates with the PC or the printer via an RS232 serial interface at 38 4 Kbits per sec baud rate with 8 bits data 1 stop bit and no parity U6 converts the RS232 signal to a logic signal of 3 3V The uC has two inbuilt serial controllers 9010 and 9011 SCIO is used for synchronous data transfer whilst 5 11 is used in asynchronous mode for RS232 Real Time Clock U3 is a Xicor X1243 real time clock with 2Kbyte of EEPROM It operates at 32 768 Khz and is powered by the lithium battery The device requires a very small amount of power during standby mode and as the unit will never drain the battery out this should be sufficient to keep the clock going for a long period of time before recharging The clock is set by the processor during the factory set up and should not require any further adjustment The date and time can be changed from the system menu The interface to the clock is a 12 bus The uC does not have a dedicated 12 bus so two port lines P20 P21 are used under software to emulate the bus The EEPROM is used for storing the calibration value and other system data If the devic
16. upply Drawing No 067 00 Revision No 1 3 Page 1 OF 3 Part No K9F6408U0A TCBO MAX3221CAE K6T4008V1C BB70 BU4S11 HD64F2318VTE25 MAX824T EXK T GM76C256CLLFW 55 T R 0518520 Rohm individual CMOS Schmitt invertor SOT23 5 package Rohm individual CMOS Schmitt invertor SOT23 5 package icor clock calander with 256 X 8 bit RAM SO 8 package Maxim SPDT analogue switch SOT23 6 package Samsung 8M X 8 bit FLASH memory TSOP44 40 package Maxim RS232 transceiver SSOP16 package Samsung 512k X 8 bit CMOS static RAM SOL32 525 package Rohm individual CMOS gate SOT23 5 package Hitachi H8S 2318 microcontroller TAFP100 package Maxim power monitor SOT23 5 package CMOS Dual D Type flip SO 14 package CMOS Quad NAND Schmitt input gate 50 14 package Linear Technology DC DC convertor SOT23 5 package Linear Technology DC DC convertor SOT23 5 package Quad 2 input OR gate Display driver Linear Technology DC DC convertor SOT23 5 package Quad surface mount op amp Gold Star 32K X 8 bit CMOS static RAM 28 pin SOP package Dallas semiconductor digital thermometer TO 92B package resistor 1 0805 package resistor 1 0805 package resistor 1 0805 package 100K resistor 1 0805 package 10M resistor 5 0805 package 100K resistor 1 0805 package 100K resistor 1 0805 package 220K resistor 1 0805 package 100K resistor 1 0805 package 10K resistor 1 0805 package resistor 1 0805 package 10K resistor
17. v Surface mount Tantalum Parts List For MicroLoop MK6 Drawing No 067 00 Revision No 1 3 Part No C35 C36 C37 C38 C39 C40 C41 C42 C43 R1 R2 R3 R4 R5 R6 DTB113EK DTC114EK DTC114EK DTC114EK XM62P02E6 XM62P02E6 FMMT491 HCS1000 HCS1000 HCS1000 HCS1000 HCS1000 U1JC44 HCS1000 NLFC453232 3R3M NLFC453232 3R3M 353 1340 F 353 1340 F 353 1340 F 353 1340 F MICROSMDO35 2 LTA75R227J 95001 2661 18FMN BMTTN TF MDS4 14FMN BMTTN TF B2B PH K S PKM35 4A0 571 672 F 485 081 F 067 09 067 15 067 13 10pF Philips or AVX ceramic 0805 package 10pF Philips or AVX ceramic 0805 package 100nF Philips or AVX ceramic 0805 package 1uF Philips or AVX ceramic X7R dielectric 0805 package 1uF Philips or AVX ceramic X7R dielectric 0805 package 1uF Philips or AVX ceramic X7R dielectric 0805 package 1uF Philips or AVX ceramic X7R dielectric 0805 package 1uF Philips or AVX ceramic X7R dielectric 0805 package 1uF Philips or AVX ceramic X7R dielectric 0805 package Rohm PNP digital transistor SOT 23 package Rohm NPN digital transistor SOT 23 package Rohm NPN digital transistor SOT 23 package Rohm NPN digital transistor SOT 23 package P channel MOSFET SOT23 6 package P channel MOSFET SOT23 6 package etex NPN Transistor SOT 23 package etex Schottky diode SOT 23 package etex Schottky diode SOT 23 package etex Schottky diode SOT 23 package etex Schottky diode SOT 23 package etex Schottky diode
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