TSC2046 and reading battery voltage

Resending in case the actual question was lost in a thread with a different name.

We are using the TSC2046 in our design here and have it working great through SPI3.1 and TSLIB. The TSC2046 also has the ability to return the voltage of a battery hooked up to one of its pins. How can this information be retrieved?

-Stevo Brock
Sunset Magicwerks