Model 8100 CO2SMO plus Service Manual Jan 1998

G

Guarantee Equipment manufactured or distributed by Novametrix Medical Systems Inc., is fully guaranteed, covering materials and workmanship, for a period of one year from the date of shipment, except for certain disposable products and products with stated guarantees other than one year. Novametrix reserves the right to perform guarantee service(s) at its factory, at an authorized repair station, or at the customer’s installation. Novametrix’ obligations under this guarantee are limited to repairs, or at Novametrix’ option, replacement of any defective parts of our equipment, except fuses, batteries, and calibration gasses, without charge, if said defects occur during normal service. Claims for damages during shipment must be filed promptly with the transportation company. All correspondence concerning the equipment must specify both the model name and number, and the serial number as it appears on the equipment. Improper use, mishandling, tampering with, or operation of the equipment without following specific operating instructions will void this guarantee and release Novametrix from any further guarantee obligations. Service Department For factory repair service, call toll free 1-800-243-3444 In Connecticut, call Collect (203) 265-7701 FAX (203) 284-0753 http://www.novametrix.com Email [email protected] Caution: Federal (U.S.A.) law restricts this device to sale, distribution, or use by or on the order of a licensed medical practitioner. Novametrix reserves the right to change specifications without notice.

CO2SMO Plus! and CAPNOSTAT are registered trademarks and Y-Sensor, SuperBright and OxySnap are trademarks of Novametrix Medical Systems Inc. Velcro is a registered trademark of Velcro USA, Inc. Cidex is a trademark of Arbook, Inc. Nafion is a registered trademark of Dow Corning Corp. Copyright 1998, Novametrix Medical Systems Inc. This document contains information which is proprietary and the property of Novametrix Medical Systems Inc., and may not be reproduced, stored in a retrieval system, translated, transcribed or transmitted in any form, or by any means, without prior explicit written permission from Novametrix Medical Systems Inc.

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Service Policy Novametrix Medical Systems Inc. will provide Warranty Service Support to its customers within 48 hours of receiving a telephone request for technical support. This 48 hour period begins once a service request is placed through the Factory Technical Support Department in Wallingford, Connecticut. Novametrix provides factory direct technical support to its customers through a technical support group located in Wallingford, Connecticut and company service representatives located throughout the United States. All Technical Support for Novametrix products is provided “Factory Direct”. Novametrix provides 24 hour a day technical support accessibility via telephone numbers (800) 243-3444 or (203) 265-7701. After hours technical support requests (before 8:00 AM and after 5:00 PM Eastern Time) will be responded to promptly by the Technical Support On-Call staff. It is suggested that any person calling in for technical support have the inoperative equipment available for preliminary troubleshooting as well as product identification. Novametrix reserves the right to repair or replace any product found to be defective during the warranty period. Repair may be provided in the form of replacement exchange parts or accessories, on-site technical repair assistance or complete system exchanges. Repairs provided due to product abuse or misuse will be considered “non-warranty” and invoiced at the prevailing service rate. Any replaced defective material is expected to be returned to Novametrix within 10 days of being provided in order to avoid additional charges. Exchanged material should be returned promptly and directly to Novametrix using the return paperwork and shipping label(s) provided. Transferring return materials to local sales or dealer representatives does not absolve return responsibility. Novametrix manufactures equipment that is generally “user serviceable” and can usually be repaired with the replacement of a plug-in electro-mechanical assembly by the clinical end user. When repair parts are provided, the recipient can call into Novametrix for on-line replacement assistance and repair assurance. In the event a replacement part requires increased technical capability, Technical Support may request Biomedical assistance, provide on-site technical support or complete replacement equipment. If the customer requires the return of their original product, the exchange material will be considered “loaner material” and exchanged again after the customer equipment is repaired. Novametrix promotes customer participation in warranty repairs should they become necessary. This program allows for customer training and a smooth transition into self-maintenance after warranty, which can provide substantial cost savings on repairs throughout the product’s life. The Novametrix Technical Support Department can provide technical product support at a level appropriate to most customers protocol and budget requirements. Please contact the Technical Support Group at Novametrix for additional information. Additional Novametrix Technical Support Programs • Focus Series Technical Training Seminars • Test Equipment and Test Kits • Service Contract / Part Insurance Plans • On-Site Technical Support • 24 hr. telephone support • “Demand Services” Flat rate parts-exchange, Flat rate return for repair Time and Material, Full warranty, discounted replacement sensors

iv Model 610 Service Manual

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Table of Contents Safety ... 1 Introduction ... 5 Indication for use ...5 Operational Overview ...5 Rear Panel Connections and Labeling ...9

Theory of Operation ... 11 2726 Power Supply Board ...11 Digital Control System ...12 CO2 System Analog Subsections ...19 Saturation Analog Subsections ...22 Flow System Analog Subsections ...23 Digital Logic List ...27

Functional Tests ... 41 Equipment Required ...41 Functional Testing ...41

Accuracy Tests ... 45 Equipment Required ...45 Test Procedure ...46

Electronic Tests ... 51 General ...51 Power Supply Testing ...52 CO2 Testing ...53 Saturation Testing ...55 Flow Testing ...57 Barometric Pressure ...58 Isolation and Leakage Checks ...58 Test Fixtures ...58 Test Fixture Construction ...59

Maintenance ... 61 General ...61 Maintenance Schedules ...61 Cleaning and Sterilization ...62 Mains Voltage Configuration ...65 Battery Maintenance ...67 Assembly Exchanges ...68

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Software Update Instructions ... 71

Specifications ... 75 General ... 75 Capnograph ... 75 Pulse Oximeter ... 76 Flow Sensor Specifications ... 76 Monitor Specifications ... 77 Additional Features ... 77

Accessories ... 79 Parts Lists ... 83 6758-00 06 CO2SMO Plus! Monitor, Model 8100 ... 83 6758-01 02 Main Assy ... 83 6765-01 02 Top Cover Assy ... 84 6868-01 00 Bottom Cover Assy ... 84 6660-01 01 Front Panel Assy ... 85 6692-01 01 Rear Panel Assy ... 85 6693-01 02 Flow Connector Assy ... 86 6699-01 00 Chassis Assy ... 86 2731-01 04 Main Board Assy ... 86 2731-17 04 Main Board Subassy ... 87 2726-17 03 Power Supply Board Subassy ... 90

Drawings ... 93

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Section 1

Safety

The CO2SMO Plus! monitor is electrically isolated. Patient leakage current flowing from the instrument to ground is limited to less than 100 uA at 120/220 VAC, 50/60Hz. For maximum patient and operator safety, you must follow the following warnings and cautions.

WARNINGS

!

Indicates a potentially harmful condition that can lead to personal injury. • Explosion Hazard: DO NOT use CO2SMO Plus! in the presence of flammable anesthetics. Use of this instrument in such an environment may present an explosion hazard. • Electrical Shock Hazard: Always turn CO2SMO Plus! off and remove the line cord before cleaning it. Refer servicing to qualified service personnel. • Never sterilize or immerse the monitor in liquids. • Do not operate CO2SMO Plus! when it is wet due to spills or condensation. • Do not operate CO2SMO Plus! if it appears to have been dropped or damaged. • Failure of Operation: If the monitor fails to respond as described, do not use it until the situation has been corrected by qualified personnel. • The CO2SMO Plus! is not intended to be used as a primary diagnostic apnea monitor and/or recording device. • Patient Safety: Care should be exercised to assure continued peripheral perfusion distal to the SpO2 sensor site after application. • Inspect the SpO2 sensor site often for adequate circulation - at least once every four hours. When applying sensors take note of patient’s physiological condition. For example, burn patients may exhibit more sensitivity to heat and pressure and therefore additional consideration such as more frequent site checks may be appropriate. • Data Validity: As with all pulse oximeters, inaccurate SpO2 and Pulse Rate values may be caused by: - Incorrect application or use of sensor; - Significant levels of dysfunctional hemoglobin; carboxyhemoglobin or methemoglobin; - Significant levels of indocyanine green, methylene blue, or other intravascular dyes; - Exposure to excessive illumination such as surgical lamps-especially those with a xenon light source, or direct sunlight; - Excessive patient movement; - Venous pulsations; - Electrosurgical interference. • A “NO RESPIRATION” alert is not generated when both the CAPNOSTAT CO2 sensor and the flow sensor are disconnected from the CO2SMO Plus!. • The CO2SMO Plus! automatically identifies the type of flow sensor (neonatal or pediatric/adult) when it is connected. If a flow sensor identification message is not displayed when a flow or CO2/ flow sensor is first connected, DO NOT use the sensor. If the condition persists, refer the monitor to qualified service personnel.

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Section 1

• Periodically check the flow sensor and tubing for excessive moisture or secretion build up. Although the CO2SMO Plus! automatically purges the lines, excessive moisture or secretions may still remain. • While using the flow sensor, a system leak, such as that caused by uncuffed endotracheal tubes or a damaged flow sensor may significantly effect flow related readings. These include flow, pressure, dead space, CO2 production and other respiratory mechanics parameters. • Connect the line cord to a grounded hospital-grade outlet. CO2SMO Plus! should be connected to the same electrical circuit as other equipment in use on the patient. Outlets of the same circuit can be identified by the hospital’s engineering department. • The CO2SMO Plus! has no protection against the ingress of water.

CAUTIONS

!

Indicates a condition that may lead to equipment damage or malfunction. • Do not operate CO2SMO Plus! when it is wet due to spills or condensation. • Do not operate CO2SMO Plus! if it appears to have been dropped or damaged. • Keep CO2SMO Plus! and its accessories clean. • Never sterilize or immerse the monitor in liquids. • Do not sterilize or immerse sensors except as directed in this manual. • Do not apply excessive tension to any sensor cable or pneumatic tubing. • Do not store the monitor or sensors at temperatures less than 14°F (-10°C) or above 131°F (55°C). • Do not operate the monitor or sensors at temperatures below 50°F (10°C) or above 104°F (40°C). • Federal (U.S.A.) law restricts this device to sale, distribution, or use by or on the order of a licensed medical practitioner. • DO NOT attach an SpO2 sensor distal to a blood pressure cuff. Valid data CANNOT be processed when the cuff is inflated. Attach the sensor to the limb opposite to the site used for the blood pressure cuff. • Excessive moisture in the flow sensor may affect the accuracy of the flow measurement. • To avoid the effects of excessive moisture in the measurement circuit, insert the flow sensor in the ventilator circuit with the tubes upright (as shown by arrows). The blue tube is positioned closest to the patient. Improper placement will result in erroneous data. • It is recommended that the CO2/Flow sensor be removed from the circuit whenever an aerosolized medication is delivered. This is due to the increased viscosity of the medications which may contaminate the sensor windows, causing the sensor to fail prematurely. • In case of interference with our equipment or another manufacturer’s equipment, notify your Novametrix representative.

NOTES Indicates points of particular interest or emphasis for more efficient or convenient operation. • Components of this product and its associated accessories which have patient contact are free of latex. • As with all flow measuring devices, adverse conditions may affect the accuracy of the flow measurement. See User’s Manual for a discussion of flow measurement. • If CO2 is being measured while not using a flow sensor, certain rebreathing circuits, or the presence of artifacts such as cardiogenic oscillations, may cause CO2SMO Plus! to react to non-respiratory CO2 fluctuations as if they were breaths. This condition affects only the numerical displays; the capnogram display continues to provide an accurate picture of the CO2 waveform.

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Safety

• When a new CAPNOSTAT CO2 sensor is attached to the monitor, or is moved from one monitor to another, it must be initialized before use. The CAPNOSTAT CO2 sensor does not have to be initialized again as long as it is used with the same monitor. • If you use the CO2SMO Plus! for transport or if you drastically change the orientation of the CO2SMO Plus!, the flow sensor must be manually re-zeroed. See the User’s Manual for more information on the flow sensor zero procedure. • After the life cycle of our equipment and all accessories has been met, disposal of the equipment should be accomplished following the national requirements. Contact the local Novametrix representative for questions concerning disposal.

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Section 1

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Section 2

Introduction

2.1 Indication for use The CO2SMO Plus! is intended to be used for monitoring end tidal CO2, respiration rate, functional oxygen saturation, pulse rate and respiratory mechanics in monitoring environments such as ventilatory support, emergency and anesthesia. CO2SMO Plus! is designed to monitor adult, pediatric and neonatal patients. CO2SMO Plus! is not intended for any other purposes.

NOTE Components of this product and its associated accessories which have patient contact are free of latex. Gas compositions other than those selected in the SETUP screen can influence CO2 and flow measurement.

2.2 Operational Overview Front Panel Controls and Indicators

2.2.1

Controls or

Power Key

Press the POWER key to place the unit into operate mode (ON) or to place the unit into standby (OFF). There are four states of the unit:

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Section 2

Operational Overview

•

No AC Power, power icon

off, not in operate mode

In this condition the AC switch is off, or the power cord is not plugged into an AC outlet, or the outlet is not powered. No monitoring may occur in this state. Battery is not being charged. •

on, not in operate mode (standby)1

AC Power, power icon

In this condition the unit may be placed into operate mode by pressing the charging in this mode. •

AC Power, power icon

key. Battery is

on, in operate mode

In this condition the unit is in operating mode and the battery is being charged. •

Battery power, power icon

off, battery is not being charged

In this condition the unit is in the operating mode and the battery is not being charged. When the monitor powers up a self test is performed in which all indicators will temporarily illuminate and the monitor will emit a short beep. Following the self test the monitor will display: “ERASE STORED TRENDS? YES: NO: ” If the or for operation.

key is not pressed within five seconds, trends will be retained. The monitor is now ready

Contrast Press or hold to adjust the display’s contrast for different up/down viewing angles.

Alert Silence Press for 2 minute silence (audible alerts muted for two minutes). The duration of the two minute silence. Press again to cancel. Press and hold for 3 seconds to disable audible alerts, and the to cancel.

icon will illuminate for the

icon will flash. Press and hold again

Press to acknowledge a latched alert. If preconfigured not to allow the audio off function, the pressed (the two minute silence is still active).

key will not disable the audible alerts when

Set Alert Limits Press to set alert limits manually, or hold to set automatically. Press again to accept the displayed limits and return to the previous screen.

Event/Freeze Press the key to freeze the waveforms and loops for sixty seconds. An EVENT MARKER with time and date will appear in the message center for three seconds followed by “WAVEFORM FROZEN

1. The monitor must be in “stand-by” mode in order for the CAPNOSTAT CO2 sensor to remain heated when the monitor is off.

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Introduction

Operational Overview

UNFREEZE: PRESS EVENT KEY”. To resume normal display press waveform will resume again in 60 seconds.

again, otherwise the

Pressing this key when viewing the DATA entry screen allows you to enter the patient’s PaCO2 for calculation of Vd/Vt phy, Vd phy and Vd alv.

CO2 Waveform/Plethysmogram Press to switch waveform display between capnogram and capnogram with plethysmogram.

Flow/Pressure Waveforms Press to switch waveform display between flow and pressure waveforms or loops, or flow and volume waveforms and loops (flow vs. volume and volume vs. pressure) display.

Trend Press to switch between trend screens.

Data Screen Press to switch between data screens (numeric values only), and data entry screen (to enter weight and PaCO2).

Setup/Configuration Press to display SETUP screen, or hold for three seconds to display CONFIGURATION screen (for advanced settings). Press again to accept the displayed settings and return to the previous screen.

Adjustment Keys Press to select different parameters in SETUP, CONFIGURATION, SET ALERTS or DATA ENTRY screen. Press and to change value or state of the currently selected parameter. The

key is also used to:

• Select different time bases on the Trend screens • Rescale various waveforms if scaling is set to manual. The YES:

Rev. 00

and NO:

keys are also used to respond to monitor prompts such as “ERASE STORED TENDS? .”

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Section 2

Operational Overview

2.2.2

Indicators Battery Alert Icon

Illuminates when the unit is on battery power and the battery charge is critically low. When battery is near exhaustion an audible alert will sound and “BATTERY VERY LOW PLUG IN AC POWER” will appear in the display screen. Refer to Battery Maintenance on page 67 for information on connecting AC power and charging the battery.

AC Power Indicator Icon Illuminates when the monitor is connected to an AC power source and the rear panel power switch is ON “|”. In this condition the internal battery is charging.

Two Minute Silence Icon Illuminates when the two minute silence is active.

Audible Alert Disabled Icon Flashes when audible alerts have been disabled.

2.2.3

Miscellaneous Top cover instructions Explosion hazard WARNING

Alert bar Sampling system inlet Flow sensor connection

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Introduction

Rear Panel Connections and Labeling

2.3 Rear Panel Connections and Labeling Equipotential connection

25 pin D connector (for communications) CONNECT ONLY TO IEC601 APPROVED DEVICES

SpO2 sensor connection

CO2 sensor connection Fuse/power setting compartment AC power switch Power cord receptacle Sampling system exhaust

Equipotential: Connection to monitor’s chassis Patient isolation: Identifies connection as type BF

Attention: Consult manual for detailed information

Mains fuse rating for replacement fuses 250V

AC mains switch “|” ON-connection to mains; “O” OFF-disconnection from mains Recyclable item. This symbol is found on the internal battery and should not concern the common user. Refer to qualified service personnel when battery replacement is required. Separate collection. Appropriate steps must be taken to ensure that spent batteries are collected separately when disposed of. This symbol is found on the internal battery and should not concern the common user. Refer to qualified service personnel when battery replacement is required.

Pb

Rev. 00

Indicates heavy metal content, specifically lead. This symbol is found on the internal battery and the monitor enclosure and should not concern the common user. Refer to qualified service personnel when battery replacement is required.

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Section 2

Rear Panel Connections and Labeling

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Section 3

Theory of Operation

The CO 2SMO Plus! monitor measures the primary parameters of CO 2 production, blood oxygen saturation, pulse rate, respiration rate, airway pressure and flow. Other parameters are derivative of these primary properties. The system contains all the circuitry necessary for controlling, collecting, conditioning and displaying patient information gathered from the CAPNOSTAT®, Saturation and FloTrak® sensors. The CO 2SMO Plus! monitor’s theory of operation is explained in detail in the subsections that follow.

3.1 2726 Power Supply Board The 2726 Power Supply Board contains the circuitry needed to power the monitor from the AC Mains (line voltage). The power supply board also connects to the battery and contains the battery charging circuitry

3.1.1

AC Mains and Battery Operation Overview

The Model 8100 can be powered from its internal 12 volt battery or from the AC Mains. The green (sine wave shaped) front panel indicator illuminates when the line cord is connected and the rear panel power switch is in the “|” (On) position. This indicates that AC Mains power is reaching the power supply, that the battery is being charged, and that if the monitor is turned on, it is being powered from the line voltage. If AC Mains power is removed by unplugging the line cord or setting the rear panel power switch to the “0” (Off) position, the monitor will operate for up to two hours from its internal 12 volt lead-acid battery. As the battery voltage runs low (≈11.5 volts), the red (battery indicator) on the front panel illuminates. At this point, the AC Mains should be reconnected to power the monitor and charge the battery. If the monitor continues to be powered from a battery in a low voltage situation, at approximately 11 volts, a continuous alarm sounds for thirty seconds while an alert message is displayed. If this alarm/ message is ignored, the monitor displays will shut down and the battery indicator will flash on and off about every 5 seconds. If AC power is now restored, the monitor will re-initialize (go through the power up and self-test routines) and resume normal operation. However, continued battery operation will eventually activate a hardware low voltage circuit (≈10.0 volts) that shuts the monitor off to prevent damage to the battery. Once the unit is shut down with the hardware circuit, the AC Mains must be connected and the front panel power key pressed before the monitor will turn back on.

3.1.2

AC Mains Operation

The AC Mains voltage enters the monitor at the rear panel Power Entry Module (PEM). This device contains a built in RFI power line filter, a double-pole single-throw switch that opens and closes both AC input lines, fuses, and an input voltage selection card. The filtered, switched and fused output of the Power Entry Module is fed to the primary coils of the rear panel mounted system transformer, T301, this is mounted on the 2726 Power Supply Board. The secondary output from T301 is fed to the Power Supply Board and is rectified by D1 (bridge rectifier) and filtered by C1. The (loaded) DC voltage at this point is approximately 20 volts.

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Section 3

Digital Control System

The 20 VDC is fed to the 2731 Main Board through fuse F301 to connector P102, and is switched to the battery charging regulator IC1 (pin 5) through Q1. Biasing for Q1 is accomplished by D2, R1 and R2 when AC power is applied. When running on battery power Q1 is biased off by R1, R2 and D3, this prevents the battery from trying to power the battery charger regulator IC1. Power to IC2 is also removed, this informs the monitor of the loss of AC via the LINEST line. The output of switching regulator IC1 pin4 is rectified and filtered by D4, C4 and L1 then fed to the battery through current sense resistor R3 and fuse F302 to J302 pin 1 (VBAT+). The battery float charge voltage is maintained at 13.2 volts except for fast charge which is regulated at 14.4 volts. The output is also monitored for over current conditions. These parameters are controlled by IC3 and associated circuitry. When the battery charge current exceeds 120mA of current IC3 pin 7 goes high which biases Q2 on, this in turn shorts out R12 which affects the feedback control (FB) to IC1 (pin 1). With R12 shorted out the control resistors R14 and R13 set the output voltage to 14.4 volts. When the charge current lowers IC3 pin 7 goes low which biases Q2 off, this puts R12 back into the feedback control which now consists of R12, R13 and R14 setting the voltage to 13.2 volts. When too much current flows through R3, IC3 pin 1 shorts IC1 pin 2 to ground which shuts IC1 off until its next switching cycle, when the current reaches a safe level IC3 pin 1 allows IC1 to remain on. The voltage switched by Q1 is also fed to IC2 as VCH (Voltage Charge). The output of this 5 volt regulator provides the LINEST (Line Status) signal to the main board at E302 pin 3. With AC applied, LINEST is high. LINEST goes low when the AC is disconnected. The LINEST line is also routed to the power on/off circuitry.

3.1.3

Battery Operation

Without AC power there will be no secondary voltage rectified by D1. Power for the monitor will be supplied from the battery at J102 pins 1 (VBAT+) and 2 (VBAT-). The battery power will conduct through D3 and F301 to the 2731 Main Board. The arrangement of R1, R2 and D2 bias Q1 off in this condition which prevents power from reaching IC1, IC2 and IC3. The output of IC1 is also protected by D5 which is now reverse biased, the bridge D1 is also reverse biased and prevents T301 from discharging the battery. With no voltage at IC2 the LINEST will be low which indicates to the main board that there is no AC power, and the front panel LED will be off.

3.2 Digital Control System For circuit diagrams of the digital section described below, refer to schematic 2731-03, sheet 1, of the schematic. Embedded control for the system is provided by IC1, a Motorola MC68332 integrated microcontroller. In addition to a full 32-bit Central Processing Unit (CPU), this device also contains circuitry for system clock generation, peripheral chip select generation, data control, interrupt generation, a sophisticated timing co-processor, synchronous and asynchronous serial communication. In general, functional signals are grouped together into ports, and each signal can be independently programmed by software to be its pre-defined port function or as discrete I/O. Additionally, the functionality for several ports (Port C, E and F) can be pre-defined by the state of the data bus on system power-up. A special “background mode” port allows the device to be controlled by an external source for system debugging and testing. Also integrated on-chip are several activity monitors, as well as a software watchdog to ensure proper device and system operation. Refer to Table 1.

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Theory of Operation

Digital Control System

Table 1. CPU / Digital Control System Functionality Control , Data Bus Control (Alt Functions: D pulled low)

Port

Defined Function

TPU 16 Channels

Timing Signal Generation

Each channel independently user programmable as TPU function or as Discrete I/O

QSM 4 Synchronous Serial Chip Selects & one asynchronous serial channel

Serial Communications Port: QSPI: Queued Serial Peripheral Interface SCI: Serial Communications Interface

QSPI chip selects independently user programmable, can be used as Discrete I/O or decoded to create up to 16 chip selects. SCI transmit can be programmed as Discrete I/O

Background Mode

System debugging

Allows an appropriate external device to control the microprocessor and system

C

Chip Selects

D0: CSBOOT* Data Width, 8 or 16-bit D1: CS1*-CS3* or BR*,BG*,BGACK* D2: CS3*-CS5* or FC0-FC2 D3-D7: CS6*-CS10* or A19-A23

E

Bus Control

D8: Control Signals or Discrete I/O

F

MODCK and Interrupts

D9: MODCK & IRQ or Discrete I/O

The maximum operating frequency of the integrated processor is 20.97 MHz. The operating frequency is software selectable and generated by an internal VCO operating from Y2, a 32.768KHz watch crystal. The Timing Processor Unit (TPU) co-processor of the MC68332 provides timing generation derived from the system clock. This feature is utilized to control the precise timing required for the acquisition of the End Tidal Carbon Dioxide (etCO2) and saturation (SpO2) signals. The TPU is also used to generate the PWM (Pulse Width Modulation) control for the CAPNOSTAT case and detector heaters, as well as provide the frequency generation for the audio tones. See Tables 2 and 3. Table 2. TPU Timing Generation for the etCO2 subsystem

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Signal

Name

Function / Timing

CO2AZ

Auto Zero

Clears the Sample/Hold circuitry prior to data acquisition. Active High, 90 us

CO2PWENB

Pulse Width Enable

Defines the active time for both phases of the bipolar source pulse, used for pulse width protection circuitry. Active High, 810 us

SRCDRV0

Source Drive 0

First source drive signal. Active High, 405 us

CS*/H

Current Sample/Hold

Enables circuitry for source current measurement. Sample is taken when SRCDRV0 is active. Low = Sample, 90 us, High = Hold

SRCDRV1

Source Drive 1

Second source drive signal delayed for 10 microseconds after SRCDRV0 ends. Active High, 395 us

SS*/H

Signal Sample/Hold

Enables circuitry for CO2 and Reference channel data acquisition. Low = Sample, 90 us, High = Hold

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Section 3

Digital Control System

CASEPWM

Case Heater PWM

PWM control for the case heater servo

DETPWM

Detector Heater PWM

PWM control for the detector heater servo

TOUT1, TOUT2, TOUT3

Tone Generation

Variable frequency outputs to generate system audio

Table 3. TPU Timing Generation for the SpO2 subsystem Signal

Name

Function / Timing

ASAMP*

Auto Zero

Clears the Sample/Hold circuitry prior to data acquisition. Active Low

RDLED*

Red Channel LED control pulse

Defines the active time for the Red LED

IRLED*

Infra-Red Channel LED control pulse

Defines the active time for the InfraRed LED

RSAMP*

Red Channel Sample/Hold

Enables circuitry for the Red Channel signal measurement. Sample is taken when SRCDRV0 is active. Low = Sample, 90 us, High = Hold

ISAMP*

Infra-Red Channel Sample/Hold

Enables circuitry for the Infra-Red Channel signal measurement. Sample is taken when SRCDRV0 is active. Low = Sample, 90 us, High = Hold

Ferrite filters have been placed on the microprocessor signals with fast rise and fall times (including timing, clock, data and address lines) in order to help reduce and suppress the radiation of electromagnetic interference (L1-L14). In addition, good EMI/EMC design techniques have been incorporated in the component layout and printed circuit board manufacture. Table 4 lists the chip select, control and discrete I/O functions for the CO2SMO Plus! system module. On power-up, Ports E and F are programmed as discrete inputs by pulling down their controlling data lines, DB8 and DB9. After power-up, the software sets up each pin function individually and performs a series of self tests to check the integrity of the system. During this initialization period, the MPU holds the SYSUP line low which keeps the system in an idle state. The state of configuration inputs on Port E (TST*, CNFG0*, CNFG1* and JP0*) are read. These inputs allow the software to identify different operating states such as Test Mode, or different hardware configurations. After the initialization period is complete and all system functions have been set, the MPU brings SYSUP high, indicating that the system is ready for operation. Table 4. Chip Select, Control and Discrete I/O Pot

Pin Functions

System Signal Name

I/O

C

14

Comments D0-D7 pulled high, Pins are Chip Select on power-up

CSBOOT**

BOOTCS*

O

Program PROM Chip Select Word (16-bits) wide mode, D0 = HIGH

CS0* / PC0 / BR*

UBRAMWR*

O

Upper Byte SRAM Write Enable Allows for byte (8-bit) or word writes

CS1*/ PC1 / BG*

LBRAMWR*

O

Lower Byte SRAM Write Enable Allows for byte (8-bit) or word writes

CS2* / PC2 / BGACK*

RAMRD*

O

SRAM Read Enable, Word

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Theory of Operation

Digital Control System

Pot

Pin Functions

System Signal Name

I/O

Comments

CS3* / PC3 / FC0

ROMWR*

O

FLASH PROM Write Enable, Word

CS4* / PC4 / FC1

IORW*

O

Control for external System and CO2 input buffer and output latch

CS5* / PC5 / FC2

ROMWREN

O

Port C Discrete Output, prevents unintentional writes to FLASH EPROM. This signal must be asserted before ROMWR* in order to overwrite the FLASH

CS6* / PC6 / A19

UARTCS*

O

High Speed UART Chip Select

CS7* / PC7 / A20

PROFILE*

O

Enables profiling data output latch

CS8* / PC8 / A21

DISPCS*

O

Display Chip Select for LCD control

CS9* / PC9 / A22

FLOWIO*

O

Control for external Flow sub-system input buffer and output latch

CS10* / ECLK / A23

RTCCS*

O

Real Time Clock Chip Select

E

D8 pulled low, Discrete I/O on power-up DSACK0* / Port E0 TST*

I

Initiate System TEST if Low

DSACK1* / Port E1 DS1*

I

Data and Size Acknowledge 1*

AVC* / Port E2

CNFG0*

I

Configuration Switch 0

RMC* / Port E3

CNFG1*

I

Configuration Switch 1

DS* / Port E4

DS*

O

Data Strobe

AS* / Port E5

AS*

O

Address Strobe

SIZ0* / Port E6

JP0*

I

Configuration Switch 2, Hardware Jumper Mode Select 0

SIZ1* / Port E7

JP1*

I

Hardware Jumper Mode Select 1

R/W*

RD*

O

Data Read Strode

WR*

O

Data Write Strobe

F

Rev. 00

D9 pulled low, Discrete I/O on power-up MODCK / Port F0

LED

O

LED CPU Activity Indicator

IRQ1* / Port F1

SYSUP

O

System Initialization Complete

IRQ2* / Port F2

CASEOT

O

Case Heater Over Temperature Shut Down

IRQ3* / Port F3

DETOT

O

Detector Heater Over Temperature Shut Down

IRQ4* / Port F4

EXTDCIN

I

Indicates external AC Mains power operation

Model 8100 Service Manual

15