The simple 3 and 5 pin sensors in the Si720x and Si721x series generally do not need a driver or example code. Just apply power and ground and the output pin will go high or low with magnetic field. Decoding the PWM or SENT data from parts with these output type is included in the source code for the Si72xx-WD-Kit which is available in simplicity studio.
The Si7210 I2C sensors can be a little more difficult to work with and drivers are available through simplicity studio.
Example code and typical uses case descriptions are also available in AN1018.