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(Pin) How should the VPP pin be handled? [2005/04/29]

Latest Updated:04/29/2005

Question:

(Pin)   How should the VPP pin be handled? [2005/04/29]

Answer:

The VPP pin is a power supply input pin of the on-chip QzROM, and is also used as port E2. When programming the on-chip QzROM, VPP pin impedance is driven low to allow the programming current to flow, and as a consequence noise can penetrate easily.
Noise tolerance can be improved by inserting a 5 kΩ resistor in series as close as possible to the E2/VPP pin and connecting to the VSS pin. (#105187)
Suitable Products
4286