All of the PIC24FJ64GA004 family of devices powertheir core digital logic at a nominal 2.5V. This maycreate an issue for designs that are required to operateat a higher typical voltage, such as 3.3V. To simplifysystem design, all devices in the PIC24FJ64GA familyincorporate an on-chip regulator that allows the deviceto run its core logic from VDD.The regulator is controlled by the DISVREG pin. TyingVSS to the pin enables the regulator, which in turn, providespower to the core from the other VDD pins. Whenthe regulator is enabled, a low-ESR capacitor (such asceramic) must be connected to the VDDCORE/VCAP pin(Figure 23-1). This helps to maintain the stability of theregulator. The recommended value for the filter capacitoris provided in Section 26.1 “DC Characteristics”.If DISVREG is tied to VDD, the regulator is disabled. Inthis case, separate power for the core logic at a nominal2.5V must be supplied to the device on theVDDCORE/VCAP pin to run the I/O pins at higher voltagelevels, typically 3.3V. Alternatively, the VDDCORE/VCAPand VDD pins can be tied together to operate at a lowernominal voltage. Refer to Figure 23-1 for possibleconfigurations.
i get a message saying check voltage
The dongle pic is 5 volts folks. RJ
Like all Microchip PIC18 devices, members of thePIC18F2450/4450 family are available as both standardand low-voltage devices. Standard devices withEnhanced Flash memory, designated with an ?F? in thepart number (such as PIC18F2450), accommodate anoperating VDD range of 4.2V to 5.5V. Low-voltage parts,designated by ?LF? (such as PIC18LF2450), functionover an extended VDD range of 2.0V to 5.5V.
Walter,When you get this figured out, then you can program a PIC for my dongle, ok?Haven't bought the pieces yet, but want to have the dongle as backup for my Entec DMX PRO...