Welcome to the Application solution on Portable Blood Pressure Monitor System , we discuss about system architecture of the Blood pressure monitor solution from Freescale, and discuss about working principle and its peripherals involved in this solution.
A blood pressure monitor is a device used to measure arterial pressure as blood is pumped away from the heart. Blood pressure monitors can use Korotkoff, Oscillometry, or Pulse Transit Time methods to measure blood pressure. They employ a pressure cuff, pump, and transducer to measure blood pressure and heart rate in three phases: Inflation, Measurement, and Deflation. They include an LCD, selection buttons, memory recall, power management, and USB interface. The pressure transducer produces the output voltage proportional to the applied differential input pressure. The output voltages of the pressure transducer range from 0 to 40 mV, which need to be amplified so that the output voltage of the DC amplifier has a range from 0 to 5V. Thus, we need a high-gain amplifier. The digital measurements of pressure and heart rate are performed by the microprocessor. Measurements results are stored in EEPROM or FLASH memory as a data log that can be uploaded to a PC via USB
Typically, from a user perspective, the monitor includes an inflatable cuff to restrict blood flow and a manometer (pressure meter) to measure the blood pressure. From a system designer´s perspective a blood pressure monitor is more complex. It consists of a power supply, motor, memory, pressure sensor and user interfaces, which can include a display, keypad or touchpad and audio, as well as optional USB or ZigBee communications interfaces. Blood pressure varies between systolic (SBP) and diastolic (DBP). Systolic is the peak pressure in the arteries, which occurs near the beginning of the cardiac cycle when the ventricles are contracting. Diastolic is minimum pressure in the arteries, which occurs near the end of the cardiac cycle when the ventricles are filled with blood. The new Flexis devices enable hardware developers to develop one hardware platform for several projects, and place in a separate bill of materials the parts for designs that require higher integration,
you can see slight variations in the overall pressure on the cuff While deflating a cuff that is attached to a person’s arm. This variation in the pressure on the cuff is actually due to the pressure change from blood circulation. This variation is amplified through a high-pass filter designed at 1 Hz, and set to an offset. This new signal is the heartbeat signal. The other signal shows variations on the pressure signal and is a graphical representation of a patient’s heartbeat over time.
Using the heartbeat detection, a simple oscillometric method is used to determine systolic blood pressure (SBP) and diastolic blood pressure (DBP). The simplified measurement is based on the idea that the amplitude of the heartbeat signal changes as the cuff is inflated over the SBP While the cuff is deflated, the amplitude of the heartbeat signal grows as the cuff pressure passes the systolic pressure on the patient. As the cuff pressure is further reduced, the pulsations increase in amplitude, until it reaches a maximum pulse known as the mean arterial pressure (MAP), and then reduces rapidly until the diastolic pressure is reached
Portable blood pressure monitors help in the early diagnosis and control of hypertension by allowing patients to cost–effectively run tests and measurements at their own homes without having to visit a physician. This page gives features of Blood pressure monitor system using Flexis QE128 family devices. The Blood Pressure Monitor reference design demonstrates how the sensing, data communication and processing capabilities of Freescale products interact to create a complete medical handheld solution. This design Enabled to use both the 8-bit MC9S08QE128 and 32-bit MCF51QE128, both members of the pin, peripheral and tool-compatible Flexis QE128 Family, Freescale provides intelligence to medical solutions providing freedom across the performance spectrum.
The QE family, comprised of a pin-compatible 8-bit and 32-bit device duo, is the first family in the Flexis series. The FlexisTM series of controllers is the connection point on the Freescale Controller Continuum, where 8- and 32-bit compatibility becomes reality. The MCF51QE128 device extends the low end of the 32-bit ColdFire controller family with up to 128 KB flash memory and a 24-channel, 12-bit analog-to-digital converter (ADC). The 32-bit MCF51QE128 is pin-, peripheral- and tool-compatible with the 8-bit S08QE128 device. They share a common set of peripherals and development tools delivering the ultimate in migration flexibility
This Page gives features about MCF51QE devices, pointing out the 25MHz bus speed, it has upto 128KB flash, 8KB of RAM, it has 70 GPIO ports.
DEMOQE128 is a cost-effective board targeting quick microcontroller evaluation. The board includes two plug-in daughter cards to highlight the ease of migration between the Flexis™ QE128, 8-bit S08 and 32-bit ColdFire V1® microcontrollers. The board also includes a power terminal to measure the ultra-low power consumption of the Flexis QE128 devices. The DEMOQE128 board also has the capability of implementing a virtual serial port on the PC. This allows the PC to send and receive serial data via the serial communication pins of P&E’s Embedded Multilink design.
Here are some of the 8/16 bit Low Power MCU Selection Guide for this solution
Here we list Premier Farnell linecard for Precision Instrumentation Amplifier
Here we list Premier Farnell linecard for Pressure Sensor for Blood Pressure Monitor
This page gives information about different Evaluation kits available for Blood Pressure monitoring system.
Here Peripherals required for Blood pressure monitor system are shown, it requires ADC, Instrumentation amplifier, LCD Pannels, Lcd Controller, Power management and controller, Battery management, USB driver..Etc.
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Solution on Portable Blood Pressure Monitor System
Solution on Portable Blood Pressure Monitor System
Agenda <ul><li>Purpose </li></ul><ul><ul><li>An Brief study on Blood Pressure Monitor system from Freescale </li></ul></ul><ul><li>Outline </li></ul><ul><ul><li>System Architecture and General Block Diagram </li></ul></ul><ul><ul><li>Application usage of Blood pressure monitor system </li></ul></ul><ul><ul><li>Solution based on Flexis QE128 Family devices from Freescale </li></ul></ul><ul><ul><li>Features of MCF51QE Family, Demo Board Details </li></ul></ul><ul><ul><li>Low power MCU, Pressure sensor and other peripheral from Farnell </li></ul></ul><ul><li>Content </li></ul><ul><ul><li>16 pages </li></ul></ul>
System Architecture of Blood Pressure Monitor System Battery Management cuff Pressure Transducer Pressure Sensor MCU USER Interface LCD Control and Backlighting Bandpass filter / Amp Alarm USB Interface Supervisory and Watchdog
Blood Pressure Monitor Block Diagram Hardware Architecture of BPM System
Blood Pressure Monitor Application Heartbeat Signal Heartbeat Over Time
Systolic and Diastolic Measurements Using HCS08 Heartbeat Versus Diastolic Pressure <ul><li>Simple oscillometric method is used to determine systolic blood pressure (SBP) and diastolic blood pressure (DBP). </li></ul><ul><li>The amplitude of the heartbeat signal grows as the cuff pressure passes the systolic pressure on the patient </li></ul>
Blood Pressure Monitor Using the Flexis QE128 Family <ul><li>Arterial pressure measurement using up-ramp and down-ramp methods </li></ul><ul><li>4 language navigation menu along with voice generator functions to enunciate results (English, Spanish, French, German) </li></ul><ul><li>Wireless RF interface implemented with SMAC protocol to send data to other coordinator, router or end devices. </li></ul><ul><li>USB connectivity to download historical data stored in MRAM (external memory). </li></ul><ul><li>Navigation buttons using proximity sensing </li></ul><ul><li>OLED for Graphical Display </li></ul><ul><li>Low Power techniques </li></ul><ul><li>implementation </li></ul>
MCF51QE Family Block Diagram MCF51QE128 Series Block Diagram
Features of MCF51QE Devices <ul><li>50 MHz ColdFire V1 core /25 MHz bus speed </li></ul><ul><li>Up to 128 KB flash memory </li></ul><ul><li>Up to 8 KB Ramdom acces memory (RAM) </li></ul><ul><li>1.8 to 3.6V operating voltage range </li></ul><ul><li>Loop-control oscillator </li></ul><ul><li>Highly accurate internal clock (ICS) </li></ul><ul><li>Single-wire background debug interface </li></ul><ul><li>Up to 70 GPIO ports, plus 16 bits of Rapid GPIO </li></ul><ul><li>16 Keyboard interrupt pins </li></ul><ul><li>-40°C to +85°C temperature range </li></ul><ul><li>Pin compatibility in 64- and 80-pin LQFP packages </li></ul><ul><li>Common development tools including CodeWarrior for Microcontrollers 6.0 </li></ul>MCF51QE
DEMOQE128 Demo Board <ul><li>Interchangeable 8-bit S08 and 32-bit ColdFire V1 QE family daughter cards </li></ul><ul><li>P&E's USB Embedded Multilink circuitry eliminates the need for external BDM cable </li></ul><ul><li>USB Cable: 5VDC, 500mA max </li></ul><ul><li>5VDC to 12VDC Power Jack: 2.5/5.5mm </li></ul><ul><li>barrel connector, center positive </li></ul><ul><li>2 AAA Battery Cells </li></ul><ul><li>MCU Port connector </li></ul><ul><li>3-axis Accelerometer w/ Enable </li></ul><ul><li>8 User LED's w/ Enable </li></ul><ul><li>4 User Push Buttons w/ Enable </li></ul><ul><li>1 Piezzo Buzzer w/ Enable </li></ul><ul><li>1 RS-232 Serial Port w/ DB9-F </li></ul><ul><li>Connector </li></ul><ul><li>IIC Pullups w/ Enable </li></ul><ul><li>10K Ohm POT w/ Enable </li></ul>
8/16 bit Low Power MCU Selection Guide IIC/Uart/SPI 11mA 12-bit 40 62 8 N/A 44 Link Link ADUC7024 Analog Device IIC/Uart/SPI 11mA 12-bit 40 62 8 N/A 44 Link Link ADUC7020 Analog Device IIC/Uart/SPI 14mA 14-bit 44 32 2 N/A 24 Link Link CY8C29666 Cypress IIC/Uart/SPI 14mA 14-bit 64 32 2 N/A 24 Link Link CY8C29866 Cypress Uart/SPI 330uA/MHz 10-bit 54 16 1 4*25 16 Link Link ATMEGA169P Atmel Uart/SPI 420uA/MHz 10-bit 69 32 2 4*40 20 Link Link ATMEGA3290P Atmel IIC/Uart/SPI 195uA/MHz 10-bit 24 16 1.54 N/A 16MIPS Link Link PIC24F16KA102 Microchip IIC/Uart/SPI 195uA/MHz 10-bit 18 4 0.51 N/A 12MIPS Link Link PIC24F04KA201 Microchip USB/IIC/Uart/SPI 170uA/MHz 10-bit 14 16 0.77 N/A 12MIPS Link Link PIC18LF14K50 Microchip IIC/Uart/SPI 110uA/MHz 8-bit 36 14 0.37 N/A 5MIPS Link Link PIC16F727 Microchip SPI/IIC/SCI 0.5mA-5.7mA 12-bit 38 8 2 4*28/8*24 20 Link MC9S08LL8 Freescale SPI/IIC/SCI 0.5mA-5.7mA 12-bit 38 16 2 4*28/8*24 20 Link Link MC9S08LL16 Freescale IIC/Uart/SPI 3.2mA 12-bit SAR 80 116 8 160 8 Link Link MSP430FG4618 TI IIC/Uart/SPI 3.2mA 12-bit SAR 80 92 8 160 8 Link Link MSP430FG4617 TI IIC/Uart/SPI 3.2mA 12-bit SAR 80 92 4 160 8 Link Link MSP430FG4616 TI Interface Power (Active Mode) ADC Resolution GPIOs Flash (KB) RAM (KB) LCD Segments Frequency (MHz) Newark # Farnell # Part Number Manufacturer
Evaluation Kits Details AD7276 Link EVAL-AD7xxxCB Controller for Precision Converter Evaluation/Demonstration Boards Amplifier Analog Device AD7273/AD7274 Link EVAL-AD7273/AD7274 Evaluation Board for the AD7273/AD7274 3 MSPS, 10-/12-Bit ADCs Data Sheet Amplifier Analog Device AD8099 Link AD8099 Evaluation Boards Amplifier Analog Device PIC24F16KA102 Link DM240311 XLP 16-bit Development Board MCU Microchip PIC24F Link DM240011 MPLAB Starter Kit for PIC24F MCU Microchip PIC24F Link DV164033 Explorer 16 Starter Kit MCU Microchip PIC24F Link DM240001 Explorer 16 Development Board MCU Microchip PIC18F Link DV164136 PIC18 Explorer Board MCU Microchip PIC18F Link DM180021 MPLAB Starter Kit for PIC18F MCU MCU Microchip QE8 Link DEMOQE8 QE8 Demonstration board MCU Freescale QE32 Link DEMOQE32 QE32 Demonstration board MCU Freescale MCF51QE128 Link DEMOQE128 MCF51QE128 Demonstration Board MCU Freescale MCF51QE128 Link EVBQE128 MCF51QE128 Evaluation Board MCU Freescale MC9S08LL64 Link TWR-S08LL64-KIT TWR-S08LL64 Tower System 8-bit Segment LCD Module MCU Freescale MC9S08LL16 Link DEMO9S08LL16 S08LL Demonstration Board MCU Freescale ADS1115 Link ADS1115EVM-PDK ADS1115 Performance Demonstration Kit ADC Texas Instruments MSP430FG4618 Link MSP-EXP430FG4618 MSP430FG4618/F2013 Experimenter Board MCU Texas Instruments Part Number URL EVKs Part Number Evaluation Kits Title Product Type Manufacturer
Peripheral Solutions for Blood Pressure Monitor Click Here Click Here LCD Controller Click Here Click Here Power Management Click Here Click Here Battery Management Click Here Click Here Instrumentation Amplifier Click Here Click Here 12/14/16 Bit ADC Newark Farnell Product Type
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