Need to program a 3.3V device, but only have 5V programmer?Designed by FemtoCow, Ships from United States of America
What is it? This is ICSP Level Shifter for AVR. I has a 3.3V and 2.7V regulator on board and a tri state buffer. It connects between AVR programmer and a device and will allow you to program a 3.3V...Read More…
This is ICSP Level Shifter for AVR. I has a 3.3V and 2.7V regulator on board and a tri state buffer. It connects between AVR programmer and a device and will allow you to program a 3.3V or 2.7 device using a 5V programmer. It can also be powered from a self powered device, anything from 5V down to 2.7V and maybe even lower (not tested).
Output voltage is selected using a slide switch. Selected voltage is indicated using LED. If you are programming a device that's self powered, select EXT, then the level shifter will be powered from the device at what ever voltage the device is using. If you select 5V0, the device will be powered directly from the programmer and the shifter will act as a tri state buffer separating the programmer from the device. Tri state buffer will go high impedance when the reset line is up, so it won't interfere with SPI communication once the program is running after programming. The maximum current it can supply is 80mV in 3.3V and 2.7V mode. It comes with 6 pin ICSP cable.
I design my Arduino or ATTiny projects for low voltage. Running ATMega at 3.3V and 1MHz consumes only 4% of power compared to running on 5V and 16MHz. I made this so I can program the board using a 5V programmer and not having to worry about blowing parts that are only 3.3V or 2.7 rated.
Do you need a programmer instead? Use Arduino Nano as ISP programmer with this shield
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Theodore | Dec. 26, 2015
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