This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430AFE253: Need Help with Chip Advice Considering SD Converter's Comb Filter and Total RAM/Flash Memory.

Part Number: MSP430AFE253
Other Parts Discussed in Thread: MSP430I2041

Hello Everyone,

Currently Im working with a MSP430AFE253 in which the configurations for the SD24 Converter ; 
SD24 Converter's Clock = 8MHz / 64 = 125KHz, with  OSR Ratio = 512. Thus configuring the comb filter to have an attenuation band up to 125KHz with notches at the multiples of 244Hz.

Now we are facing some problems due to small memory of the AFE253 device and considering an update to a device with a higher RAM/Flash Memory; At least 2k RAM, 32K Flash is needed.

Firstly we considered  MSP430I2041, thought it would be a good choice, but then we realized it has a fixed SD Converter clock speed of 1.1 MHz and OSR is only up to 256.

We want to keep the filtering provided by the COMB Filter in AFE253 same.

So Is there any way/workaround to achieve that with the I20xx series chips ?? Is it Possible to implement the missing part of the notch bank by software? Would it be the correct approach ?(given the MSP430 has no FPU)

If not  I also appreciate a recommendation for some other chip series that comes with  the SD Converter(SD16 is also OK.) that we can configure for the same filter parameters.

I wish for happy and healthy days, İlker.

  • Hello,

    Unfortunately, I'm not sure about a software workaround to apply the filter to the I2041 devices.  Let me ask around and see if I can get an opinion for you here.  

    As for alternative devices, are there any other requirements?  I found the MSP430F6721 which has a SD24_B that looks at quick glance like it could meet your existing sampling rate and OSR, as well as memory requirements.    

    Take a look at that device family and let me know.  



**Attention** This is a public forum