The Pinnacle device used on the TM023023, TM035035 and TM040040 Circle Trackpads can be configured to work at 5.0V. 

If you wish to run the Pinnacle at 5.0V, all you have to do is remove R7 and R8. It is that simple. When R7 and R8 are not installed, the Pinnacle chip uses internal regulators to convert the 5.0V input (on the VReg_Vdd, pin 47) to 3.0V internally.

When the Pinnacle device is running in this mode, the I/O signals (I2C or SPI) will be working in the 5.0V domain as well.