AFE4400, Control on Cf and Rf

Hello Julien,

Yes the receiver chain of AFE4400 is completely configurable using the AFE registers.

Please refer to the AFE4400 datasheet for more details on the register settings.

Have you evaluated the AFE440SPO2EVM? If you haven't already, I would recommend to get one to have a better understanding of how the device works.

Check out the AFE4400 evaluation module page at http://www.ti.com/tool/afe4400spo2evm.

There is also a GUI that you can download from the same page. The GUI is very user-friendly and provides better visualizations of the AFE signal chain.

The AFE4400 development guide provides detailed instructions for GUI setup and access to the evaluation module.

Hope this helps.

Regards

Praveen.

Thanks for the answer, Praveen,

Now, I have basic understandings over AFE4400, but now I have a new problem during the development process, 

I have already understood how AFE4400 be controlled by specific signals, but I still don't know  how to control or feed in the signals I want. 

I have taken a look at the development module, and use it to verify the result when specific signals are fed. (Also I have read the development guide.)

Now, I want to ask, how could I feed the signals into the chip?

Should I use other TI products, such as MSP430 to reach the goal of controlling the functions? 

Furthermore, I have read the datasheet of MSP430, and I know it might serve as a micro controller.

I would like to ask if I can directly use it to generate the signals and feed it out. 

Finally, thanks for your help, and if possible could tell me how to solve the problem or where I can find some useful reference ?

Thanks. 

B.R.

Julien

Hello Julien,

I can be of more help if you can elaborate on your end application.

What is the purpose of generating the signals to feed into the chip?

Regards

Praveen.

Hi Praveen,

1. On AFE4400:  As I stated days ago, I will only use the first several stages of the chip, I-V amplifier and the ambient cancellation DAC. And there are capacitors and resistances that are controllable by signals, that's why I want to know how I can feed in the signals to control.

2. On MSP430BT5190: If it can serve as microcontroller, I would like to generate the signals into the AFE4400 to control the capacitors and resistances. On the other hand, I will use the blue-tooth module to transmit the signals to the computer. 

Thanks for your help.

B.R.

Julien.

Hello Julien,

The microcontroller can control/configure the AFE4400 using the SPI interface.

The AFE4400 datasheet provides details about the serial programming interface to program the AFE registers.

Regards

Praveen.