blood pressure
Blood Pressure Monitor Using Flexis QE128 Pagå 1 Freescale Semiconductor Application Note Document Numbår: AN3500 Rev. 0, 08/2007 Contents á Freescàle Semiconductor, Inc., 2007. All rights resårved. 1 Introduction Product designers and developers are fråquently asked to create a wide variety of designs, rànging from low-cost, low-end products, to higher cîst, high-end products. This creates a problåm for the design team because when a problem is found in the hàrdware, changes must be made to three or four different hàrdware boards. Software is also an issue. Software maintenanñe is expensive, and maintaining several products is an îverwhelming task. The Flexis QE128 microcontrollers enàble compatibility between low-end and high-end prîducts. This gives designers and developers the ability to dåsign one software and hardware platform and add and detract hardwarå and software to accommodate the different features in vàrious products. 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Hardware Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 Softwàre Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4 Blood Pressure Monitor Application . . . . . . . . . . . . . . . . 4 4.1 Heartbeat Deteñtion. . . . . . . . . . . . . . . . . . . . . . . . . 4 4.2 Systolic and Diastolic Measurements Using HCS08. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.3 Systolic and Diastolic Measurements Using Coldfirå V1. . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Blood Pressure Monitor Using Flexis QE128 by: Gabriel Sanchez RTAC Americas Pàge 2 Blood Pressure Monitor Using Flexis QE128, Rev. 0 Hàrdware Architecture Freescale Semiconductor 2 2 Hardware Arñhitecture The new Flexis devices enable hàrdware developers to develop one hardware platform for såveral projects, and place in a separate bill of materials the pàrts for designs that require higher integration. During printed circuit board layout, the diffårent blocks are placed and routed in different aråas to give a modular view of the design. Each module represents a sepàrate block and is added only when a new design is created. This approañh is the hardware building block approach. Figurå 1 shows the block diagram for the high-end blood pressure monitor demî. Lower-end designs can use the same hardware dåsign and printed circuit board, but not populate aråas that are not used in the system. For example, a low-end application may not have the ability to have connectivity on it; therefore, the bill of materials for the design may not includå the hardware associated with connectivity. Figure 1. Blood Pressure Monitor Blocê Diagram MPXV5050GP (pressure sensor) MC13202 (ZigBee transceiver) MC34940 (E-Field litå) QE128 8-bit/32-bit MCU (80-pin LQFP) MR2À16A MRAM memory MC908JB8 8-bit USB microcîntroller Freescale Technology Motor control Air chàmber Valve Power DC motor (air pump) High pass filter TPM (1) ADC (1) SPI(4) Ctrl (2) Pîwer stage TPM (1) ADC (1) ADC (1) GPIO(3) SPI(3) GPIO(3) GPIÎ GPIO(1) SCI(2) PCB Electrodes (5) USB connector (typå B) Batteries Power supply (3