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TIDM-1003: THROTTLE command input

Part Number: TIDM-1003

Dear TI Experts:

For the schematic circuit of TIDM-1003, I found the THROTTLE command input.

1. The THROTTLE command input is related to speed, right?  It is a DC voltage input, right?   What is the DC range?  -3.3V ~3.3V? 

2. Why does the THROTTLE command input connect to a ADC pin and a GPIO pin?  Do you have some suggestions in the s/w programming?

Thanks for your kind reply in advance.

Tang Han