MED-EKG - Farnell
Contents
1. 2 INP2 2 3 Trough R12 to OUT2 E Right electrode gain must be 1 2 Gain is 100x the same as J4 2 3 Gain is 10x 14 Left electrode gain must be the 1 2 Gain is 100x same as J3 2 3 Gain is 10x open R17 connection is open shunt R17 is connected to Vref1 6V J5 Enabling R17 connection 16 Right electrode connection 1 2 Right electrode is connected to external INA input must be the same as J7 2 3 Right electrode is connected to MM internal amplifiers 7 Left electrode connection must 1 2 Left electrode is connected to external INA input be the same as J6 2 3 Left electrode is connected to MM internal amplifiers 1 2 DSC is feed from internal MM amplifiers output 2 3 DSC is feed from signal selected in J9 J8 ADC input to DSC MED EKG User Manual Page 6 of 7 Po 2 freescale semiconductor 1 2 Selected signal is the external INA circuit 2 3 Selected signal is the output of internal amplifier OUT2 J9 Signal selector jumper J10 JTAG ONCE header open It is used to program the DSC 1 2 Reference electrodes are connected to ground J11 Reference electrodes selector 2 3 Reference electrodes are connected to Vref1 6V J12 Externalelectrodes connector open It is used to connect external electrodes Table 2 MED EKG Jumper Table NOTE When J3 and J4 are set to 100x you must use external electrodes via J12 instea2. 4 kS Z freescale MED EKG User Manual Rev 1 0 Freescale Semiconductor Inc Po Sa z freescale semiconductor Contents T OvervieW siaaa aaa au siasa ED EEN kus sss 3 2 Reference DOCUMIENIES wii icesicccssscsvaccsviescecccccessesecsvcnssadtvadessvdesvacedsassudesinacseccocesasesasreactivabucactbacbsadeurseortedieees 4 3 Hardware FOatures scciscicsdsicccsiegicecovicdccecstaesetaccuracaresceiadsstauvjeccvaccotsesidecueievtuedueicuvieucdsudstuccsisderseesineeudedsdens 4 3 L SYSTONT POWEL 2 cede ccesutceszitesdebsnesutuasivcate candeastecyeust sandacsttuesaslissaveaitascitedarend calesciuzisuasa acszecuesdeanisetsstatedatt aana aaa 4 3 2 Deb g Interface eee eee ee eee ee eee 4 3 3 Medical COMME COL weiss u au u Sua a ta ana aaa Eaa aa ses dat teen ddr aq scie ed desert aies ttes tous 4 3 4 Mechanical Form Bator g uu a u nun a un nasa manuna S Ran Qi RSS aQ u ai uu pana asss sQ hua 5 3 5 External Electrodes Connector au u a aaa Sa aasan 5 3 6 Sider Electro uquy annee uen mens aN eu aS rh BS Qami aa h a 6 4 J umper Tableuu anne nana nan neue are EAEE aana daearen danien 6 MED EKG User Manual Page 2 of 7 e of oa Z freescale semiconductor 1 Overview The Medical EKG Module MED EKG is a low cost development board that allows users to rapidly prototype electrocardiogram EKG ECG applications Users can choose to develop EKG ECG applications using the external analog components or by using the Flexi
3. als must be validated for each customer application by customer s technical experts Freescale Semiconductor does not convey any license under its patent rights nor the rights of others Freescale Semiconductor products are not designed intended or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for any other application in which failure of the Freescale Semiconductor product could create a situation where personal injury or death may occur Should Buyer purchase or use Freescale Semiconductor products for any such unintended or unauthorized application Buyer shall indemnify Freescale Semiconductor and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indirectly any claim of personal injury or death associated with such unintended or unauthorized use even if such claims alleges that Freescale Semiconductor was negligent regarding the design or manufacture of the part RoHS compliant and or Pb free versions of Freescale products have the functionality and electrical characteristics as their non RoHS complaint and or non Pb free counterparts For further information visit freescale com or contact your Freescale sales representative For information on Freescale s Environmental Products program visit freescale com e
4. d of using the on board slider contacts On board slider contacts yield more noise due to the unsecure connection with fingers Noise in the first stage of instrumentation with higher amplification can easily results with saturated output so you won t be able to see the EKG output in the final amplification stage NOTE MEG EKG by default is configured to use the Flexis MM on chip analogs The option that uses external INA is not functional by default Information in this document is provided solely to enable system and software implementers to use Freescale Semiconductor products There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document Freescale Semiconductor reserves the right to make changes without further notice to any products herein Freescale Semiconductor makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does Freescale Semiconductor assume any liability arising out of the application or use of any product or circuit and specifically disclaims any liability including without limitation consequential or incidental damages Typical parameters that may be provided in Freescale Semiconductor data sheets and or specifications can and do vary in different applications and actual performance may vary over time All operating parameters including Typic
5. ge 3 of 7 Po PS Z freescale semiconductor 2 Reference Documents The documents listed below are available online Refer to www freescale com tower or www freescale com medical for the latest revisions of these documents e MED EKG Schematics e Quick Start Guide for TWR SO8MM128 e Quick Start Guide for TWR MCF51MM e TWR MCF51MM KIT and TWR SO8MM128 KIT Labs 3 Hardware Features This section provides more details about the features and functionality of the MED EKG 3 1 System Power The MED EKG is powered by the default trough connector J1 but can be also powered by the JTAG ONCE port Do not apply both power sources at the same time NOTE Power switch is controlled by the MCF51MM256 or MC9SO8MM128 pin PTE7 from the corresponding Tower System MCU module To turn on the MED EKG module in your software make sure to set PTE7 pin to output low active low To turn off set PTE7 to output high This has already been done in the MED EKG demonstration software in the TWR MCF51MM KIT or TWR SO8MM128 KIT 3 2 Debug Interface The included DSC is factory programmed with firmware for digital filtering a band pass filter and a notch filter however it can be reprogrammed using an external JTAG ONCE interface USB TAP for user specific applications It can be connected on header J10 3 3 Medical Connector Header J1 2x10 pins of MED EKG provides connectivity with either the TWR MCF51MM or the TWR S08MM128 board thr
6. ough the medical connector It allows the use of internal OPAMPs TRIAMPs ADC and DAC of Flexis MM 32 bit or 8 bit microcontrollers to implement the requirement of signal conditioning Pin 3 and 4 can also be used to send DSC filtered data to the target Tower MCU Table 1 shows the signal present in each pin of medical connector Please refer to TWR MCF51MM KIT or the TWR SO8MM128 KIT LAB1 MED EKG DEMO for instructions on assembling with the Tower System MED EKG Signal Pin MED EKG Signal VDD 3 3V 1 2 GND ECG_IIC SDA 3 4 ECG_IIC_SCL MM_AdcEcgSignal 5 6 GND MM_AdcBaseline 7 8 MMDac OUT1 9 10 OUT2 MED EKG User Manual Page 4 of 7 e of oa Z freescale semiconductor INP1 11 12 INP2 INP1 13 14 INP2 VINP1 15 16 VINP2 VINN1 17 18 VINN2 TRIOUT1 19 20 TRIOUT2 Table 1 Medical Connector 2x10 Pin Header Connections 3 4 Mechanical Form Factor The MED EKG is intended to be used as an expansion of the TWR SO8MM128 and TWR MCF51MM boards It s designed for the Freescale Tower System and complies with the electrical and mechanical specifications that are described in Freescale Tower Electromechanical Specification 3 5 External Electrodes Connector The external electrodes connector is labeled as J12 on the MED EKG module This connection yields less noise and provides the best way to prototype your EKG application in
7. pp Z freescale semiconductor Freescale and the Freescale logo are trademarks of Freescale Semiconductor Inc All other product or service names are the property of their respective owners Freescale Semiconductor Inc 2010 All rights reserved MED EKG User Manual Page 7 of 7
8. s MM microcontroller s on chip analog modules or a mixture of both MED EKG is designed to work with the TWR MCF51MM module and TWR SO8MM128 module The EKG ECG software demonstration and step by step lab guide is available in the both the Tower System TWR MCF51MM KIT and TWR SO8MM128 KIT or from www freescale com NOTE TWR MCF51MM KIT features the 32 bit MCF51MM256 microcontroller and the TWR SO8MM128 KIT features the 8 bit MC9SO8MM128 microcontroller Peripherals between these two 32 bit and 8 bit MCUs are either identical or compatible they are called the Flexis devices The following list summarizes the features of the MED EKG board e Freescale Tower System compliant and small form factor External connector to TWR SO8MM128 and TWR MCF51MM MCU modules Includes the MC56F8006 DSC used for signal conditioning Electrodes embedded in development board for easy EKG signal detection using fingertips Open connector for any type of EKG electrodes for additional precision JTAG ONCE connector for DSC programming Different jumper configurations to allow various signal conditions Low power Figure 1 MED EKG Block Diagram JTAG ONCE Medical Connector 14 pin header 33V Internal amplifiers In Out Compensation MM 16 bitADC External electrodes connector MM 12 bit DAC Compensation Ml Freescale Silicon MM External Connectors MM interface Circuits Power Jumper configurations INA Instrumentation Amplifier MED EKG User Manual Pa
9. stead of using the on board sliders contact The user can connect a 3 lead cable 2 electrodes and 1 ground via J12 header and use external electrodes Freescale does not provide this lead due to regulations in different countries The user has to purchase it separately This board was tested with Welch Allyn ECG Lead Wires for Atlas Monitor 3 lead AHA Figure 2 shows a connection example with external electrodes Left Abdomen black electrode r Left arm Right arm i white electrode red electrode pe Figure 2 External Electrodes Connection Example MED EKG User Manual Page 5 of 7 Le of a Z freescale semiconductor 3 6 Slider Electrodes The on board slider electrodes are used when external electrodes are not available The user can place their fingers as is shown in Figure 3 Since the contact is not as secure as the external electrodes leads you must avoid any small movement to reduce input noise See TWR MCF51MM KIT or TWR SO8MM128 KIT LAB1 guide for tips Figure 3 Fingertips Collocation on Slider Electrodes 4 Jumper Table There are several jumpers provided for configuration and connection selection Refer to Table 2 for details The default installed jumper settings are shown in bold Jumper Option Setting Description Connection with TWR S08MM128 or TWR MCF51MM J1 Medical board connector open boards 2 Connection of MM 1 2 Directly to Vref1 6V OPAMP
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