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We are in the process of developing a portable SpO2 machine using the SFH7050A sensor (comprising an LED and PD) and the AFE4403. We have two ideas for the design configuration:
1. Placing the LED and PD on one PCB while locating the AFE and microcontroller on a separate PCB.
2. Integrating the LED, PD, and AFE on one PCB and positioning the microcontroller on another PCB.
We have several questions regarding these design options:
For Idea 1 (LED/PD on one PCB, AFE/microcontroller on another PCB):
- We are considering using a standard USB-C cable to establish the connection between the LED/PD PCB and the AFE/microcontroller PCB. How feasible is this approach in terms of cost, accuracy, and stability? What design considerations do we need to follow?
- What type of output do the LED and PD provide, and do they follow any specific communication protocol (such as I2C, SPI, UART, etc.)? What design considerations should we keep in mind to implement this connection?
For Idea 2 (LED/PD/AFE on one PCB, microcontroller on another PCB):
- Similar to Idea 1, we plan to use a standard USB-C cable to connect, here the LED/PD/AFE all are combined with one PCB connected with the microcontroller PCB. How feasible is this in terms of cost, accuracy, and stability? What are the key design considerations?
- The AFE4403 provides SPI/I2C output. How can we transfer this protocol data to the microcontroller via a standard USB-C cable, and what design considerations should be taken into account?
We appreciate any guidance on these design choices and considerations to ensure the successful development of our SpO2 portable machine.
