2.2 Powering the Atmel AVR JTAGICE mkII

The Atmel AVR JTAGICE mkII is able to operate using an external power supply providing 9-15V DC or it can be powered directly from the USB bus. An internal switch will default select the power from the external power supply. However, if this is not connected, or the external power supply drops below a usable level the power will be taken from the USB (if connected).

Although any polarity will work, the preferred polarity of the DC jack is negative-centre due to the power switch grounding. When powering up the JTAGICE mkII, the power LED should illuminate immediately. If the LED does not light up, check that an adequate power supply is being used.

Note: If the JTAGICE mkII is powered from the USB only, it's required that the USB can deliver minimum 500mA (Self Powered Hub).

When the JTAGICE mkII is properly connected to the target and the host PC, the power can be turned on. It's recommended to power up the JTAGICE mkII before the target is powered, to avert the possibility of current flowing from the target into the unpowered JTAGICE mkII.

Two LEDs indicate emulator power and target power respectively as shown in the Hardware descriptions section.