How to use programmable current source and comparator in the cc2650 sensor controller?

It's recommended to use Sensor Controller Studio to write code to access these peripherals.

See dev.ti.com/.../node

Here you also find an overview of how the modules are connected together internally and code snippets on how to use them.

Thanks you reply!

I means that how to desiger hardware?

i think change voltage use current source base on cc2650.