ADI ADuC702x脉搏血氧仪解决方案

脉搏血氧仪以非介入方式测量血液中的含氧量,包括发射路径,接收路径,显示和背光,数据接口以及音频报警。发射路径包括红光LED,红外光LED和用于驱动LED的DAC。接收路径包括光电二极管传感器,信号调理,模数转换器和处理器。ADI的脉搏血氧仪解决方案采用ADuC7024精密模拟微控制器,具有多达16路的12位1MSPS的ADC和采用ARM7TDMI核16位/32位RISC架构的MCU.本文介绍了ADuC7019/20/21/22/24/25/26/27/28/29主要特性和功能框图, ADuC7024评估板主要特性, 电路图和材料清单,以及ADI脉搏血氧仪功能框图及其主要元件表, 脉搏血氧仪演示系统框图和所用的主要产品表.
The ADuC7019/20/21/22/24/25/26/27/28/29 are fully integrated, 1 MSPS, 12-bit data acquisition systems incorporating high performance multichannel ADCs, 16-bit/32-bit MCUs, and Flash®/EE memory on a single chip.
The ADC consists of up to 12 single-ended inputs. An additional four inputs are available but are multiplexed with the four DAC output pins. The four DAC outputs are available only on certain models (ADuC7020, ADuC7026, ADuC7028, and ADuC7029). However, in many cases where the DAC outputs are not present, these pins can still be used as additional ADC inputs, giving a maximum of 16 ADC input channels. The ADC can operate in single-ended or differential input mode. The ADC input voltage is 0 V to VREF. A low drift band gap reference, temperature sensor, and voltage comparator complete the ADC peripheral set.
Depending on the part model, up to four buffered voltage output DACs are available on-chip. The DAC output range is programmable to one of three voltage ranges.
The devices operate from an on-chip oscillator and a PLL generating an internal high frequency clock of 41.78 MHz (UCLK). This clock is routed through a programmable clock divider from which the MCU core clock operating frequency is generated. The microcontroller core is an ARM7TDMI®, 16-bit/32-bit RISC machine, which offers up to 41 MIPS peak performance. Eight kilobytes of SRAM and 62 kilobytes of nonvolatile Flash/EE memory are provided on-chip. The ARM7TDMI core views...