Medical Applications Guide (Rev. B - Mouser Electronics

Diagnostic, Patient Monitoring and TherapyVentilation35➔Continuous Positive Airway Pressure MachinesTMS320C2000Get samples, datasheets, evaluation modules and app reports at:www.ti.com/c2000Continuous Positive Airway Pressure Machines (CPAP) are an effectivemeans in preventing intubation, decreasing mortality in patients withacute respiratory failure, helping patients with sleep apnea andreducing chronic respiratory failure.Designers of CPAP machines are concerned with the efficiency inrunning the motor that drives the continuous airflow of the patient,reducing as many components on the system board for a lowercost and easy development for a quicker time to market. CPAPsystems designers value the TMS320C2000 Digital Signal Controllerfor its exceptional capabilities, including:1. TMS320C2000 digital signal controllers are high-performance,low-cost ICs that control motor speed, position and torque inreal time. If necessary these controllers can even provide theprocessing power for executing high-sophisticated position andspeed estimation algorithms to control the motor using datafrom resolver, encoder and halleffect sensor.2. These high-performance controllers not only provide accuratecontrol of the motor but can also provide additional MIPS andperipheral integration to act as the host MCU. These ICs canperform up to 150MIPS and have a high level of peripheralintegration with on-chip flash, a 12-bit, 16-channel ADC with upto 12.5MSPS performance and multiple GPIO pins so designerscan use a single controller for a lower cost.3. The C2000 platform has an extensive motor control library(www.ti.com/c2000appsw) that can help a developer get thesoftware framework necessary to control either a 1ph or 3phBLDC motor. In addition, the C-compiler efficiency eliminatesthe need for most assembly coding.Key Features• Up to 150 DSP MIPS for reducing system cost• On-chip programmable flash• C-compiler efficiency eliminates the need for most assembly coding• 10- or 12-bit ADCs with up to 16 channels and 12.5MSPS• Independent or complementary PWM with deadband• Independent duty-cycle or phase control• 150ps high-resolution PWM• Encoder interfaces and event capture inputs• CAN 2.0B, SCI, SPI, and I 2 C port interfaces• Long product life cycle assures supply continuityCode Security32 to 256KBFlash32 x 32 BitMultiplier32 BitTimers (3)Real-TimeJTAG12 to 36KBRAMMemory BusInterrupt ManagementC28x 32-bit DSPR-M-WAtomicALU32 BitRegisterFileBootRAMTMS320C2000 digital signal controller block diagram.Host MCU• LCD• I/O• Store Patient Data• Speed Control• PWM• ADC for Back EMF• Sometimes SensoredC2000 DigitalSignal ControllerTMS320C2000 DSCPeripheralBusDriver+InverterTMS320C2000 digital signal controller in simplified patientmonitoring system.PWMQEPCAPTimersADCWatchdogGPIOSPISCII 2 CCANPatientMonitoringCompressor:BrushlessorDC MotorTexas Instruments 2Q 2007Medical Applications Guide