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PICkit™ 2 and ICSP™

3.4 VDD

During ICSP programming, the PICmicro MCU needs to be powered in accordance

with the device specification. Typically, the PICmicro MCU supply voltage is connected

to the application circuit supply voltage. The application circuit can be powered by the

PICkit 2 Microcontroller Programmer or externally. There are a few precautions that

need to be observed.

3.4.1 The application circuit is powered by the PICkit 2

Microcontroller Programmer.

The PICkit 2 Microcontroller Programmer supply voltage (VDD) is +5V. If the application

circuit operates at a different voltage, isolation circuitry may be required so that the two

voltage levels do not conflict.

3.4.2 The application circuit is powered externally.

The PICkit 2 Microcontroller Programmer supply voltage (VDD) is +5V. If the application

circuit operates at a different voltage, isolation circuitry may be required so that the two

voltage levels do not conflict.

3.4.3 Bulk Erase is used.

Some PICmicro MCU devices use a bulk erase function to erase program memory,

data EEPROM memory, ID locations, and Configuration bits. Typically, the bulk erase

function requires a supply voltage (VDD) of 4.5 to 5.5 Volts (refer to the device

programming specification for device specific requirements).

This voltage range can be a problem if the application circuit is designed to operate at

a different supply voltage range. In order to bulk erase the PICmicro MCU, the

application circuit needs to take into consideration the bulk erase voltage requirement

while protecting any voltage sensitive circuitry.

CAUTION

The PICkit 2 Microcontroller Programmer supply voltage (VDD) is +5V.

CAUTION

The USB port current limit is set to 100 mA. If the target plus PICkit 2 Microcontroller

Programmer exceeds this current limit, the USB port will turn off. The target may be

powered externally if more power is required.

CAUTION

The PICkit 2 Microcontroller Programmer supply voltage (VDD) is +5V.

Microchip Technology PICkit 2 User Manual

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