SNLS477B October 2014 – November 2018 DS90UB948-Q1
The deserializer has a PDB input pin to ENABLE or POWER DOWN the device. This pin can be controlled by the host or through the VDDIO, where VDDIO = 3 V to 3.6 V or VDD33. To save power, disable the link when the display is not needed (PDB = LOW). When the pin is driven by the host, make sure to release it after VDD33 and VDDIO have reached final levels; no external components are required. This pin is preferred to drive PDB pin through microcontroller where the RC filter is optional. In the case of driven by the VDDIO = 3 V to 3.6 V or VDD33 directly, a 10-kΩ resistor to the VDDIO = 3 V to 3.6 V or VDD33 and a > 10-µF capacitor to the GND, are required (see Figure 47).