TITMS320VC5505脉冲血氧计解决方案  2012/3/1

        TI公司的TMS320VC5505是基于TMS320C55xDSPCPU核的定点DSP,它的C55x™ DSP架构可得到高性能和低功耗特性,CPU支持内部总线架构,包括一条可编程总线,一条321位数据总总线和两条16位数据读总线,两条数据写总线和专门用于外设和DMA的其它总线. TMS320VC5505还包括4个DMA控制器,每个四路.时钟为60MHz或100MHz,指令周期为16.67ns或10ns.主要用于无线音频设备,回声消除耳机,手提媒体设备,视频,工业控制,指纹生物学和SDR.本文介绍了TMS320VC5505的主要特性和方框图以及采用TMS320VC5505的脉冲血氧计方框图, VC5505EVM评估板主要特性, 脉冲血氧计前端方框图和电路图以及所用材料清单.

Pulse Oximeter Implementationon the TMS320VC5505 DSP Medical Development Kit

Pulse oximeters measure arterial blood oxygen saturation by sensing absorption properties of deoxygenated and oxygenated hemoglobin using various wavelengths of light. A basic meter is comprised of a sensing probe attached to a patients earlobe, toe, finger, or other body locations, and data acquisition system for the calculation and display of oxygen saturation level, heart rate, and blood flow.


图1.脉冲血氧计方框图

The TMS320VC5505 is a member of TIs TMS320C5000™ fixed-point Digital Signal Processor (DSP) product family and is designed for low-powerapplications.

The TMS320VC5505 fixed-point DSP is based on the TMS320C55x™ DSP generation CPU processor core. The C55x™ DSP architecture achieves high performance and low power through increased parallelism and total focus on power savings. The CPU supports an internal bus structure that is composed of one program bus, one 32-bit data read bus and two 16-bit data read buses, two 16-bit data write buses, and additional buses dedicated to peripheral and DMA activity. These buses provide the ability to perform up to four 16-bit data reads and two 16-bit data writes in a single cycle. The TMS320VC5505 also includes four DMA controllers, each with 4 channels, providing data movements for 16-independent channel contexts without CPU intervention. Each DMA controllercanperform one 32-bit data transfer per cycle, in parallel and independent of

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