An internally generated 4.6-V supply capable of driving up to 10 mA can be output on DVDD by leaving the DVDD-EN pin unconnected. This configuration simplifies the system power-supply design when an isolation barrier is required to generate the digital supply. The internally generated supply can be used to drive isolation components used for the digital data lines and other miscellaneous components, such as references and temperature sensors; see Figure 9-3 for an example application.

If an external supply is preferred, the DVDD pin (which can be driven up to 5.5 V in this case) can become an input by tying DVDD-EN to GND. See Section 7.5 for detailed specifications.