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How to control output voltage of TPS7A7100/TPS7A200 using GPIO expander or Microcontroller

Other Parts Discussed in Thread: TCA6424

These Anyout regulators have 6 pins that need to be selectively connected to ground to program the output voltage in 50mV resolution. If I connect the pins to an I/O expander (planning to use TCA6424) and then pull them to ground, there will be a transistor in the path to ground that will effect the output voltage. what is the proper way to automatically control the programmable output ?

Is there a I2C or digitally programmable LDO available that will ease the control ?