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Q: What is the purpose of the MSP430G2121` on the ADS1298RECGFE-PDK?
A: The MSP430G2121 on the ADS1298RECGFE-PDK board is there to help simulate respirations. It is factory programmed (through J7) to create a square wave of 0.1 to 0.5Hz. The frequency is selectable in the GUI as 0.1, 0.2, 0.3 (default), 0.4 or 0.5Hz. That signal is fed through JP36 to a comparator (U12 pin 2) and the output of the comparator drive the analog switch (U11). If you want to use your own signal generator to simulate respiration, you can apply a square wave to the SMA connector (J6) and move the shunt on JP36 to cover pins 2-3.
The MSP430 is there only to help you evaluate the respiration function without having to connect additional test gear to the EVM. You do not need to put anything from your processor into J7. J7 is there to accommodate the Spy-Bi-Wire Interface of the MSP430G2121 only, which is how we programmed the device to generate the square wave mentioned above.
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