Objective Development Forums

Every ATmega8 should work with 12MHz and 3.3V

I am working with ATmega8L-8 AU,
I have make a Test and they run with:
2.55V @ 12MHz (3.3V for V-USB, with 1k Ohm from +3.3V to D- , 1M from GND to D+ )
and
4.3V @ 26MHz (overclocking, 5V)

Hello 1.21Gigawatts,

connect your V-USB-Device to a USB-Hub (USB 1.1 or 2.0) this can solve a many problems with some crazy South-Bridges.

Ugly! wrote:- Do I have to use 3.6V zenner diodes if I'm powering with the 2x AA batteries?

In this case you don't need Z-Diodes, the Voltage is lower than 3.3V.

Difference between AVR Pin Voltage and Voltage on USB-Data-Line: 5V - 3.3V = 1.7V The Current over an AVR I/O-Pin: 25mA (maximum 40mA, but this is not recommended) R=U/I R=1.7V / 0.025A = 68 Ohm I don't use Z-Diodes and lower resistor values (33 Ohm) because the Supply Voltage of my AVR is 3.3V and ...

Hello frank, I create a PCB with 3.3V Voltage regulator for the Controller and a USB connection to my AVR. If I use a 1.5k PullUp to 3.3V the PC and the Hub does not find the "VOTI- Device" if I connect the 1.5k Resistor to 5V the device will be found and everything works. For connecting +...

Hello Tweety955, I am using an ATmega8 with "vusb-20100715" and my OS is LinixMint10. I can plug the Device in my USB1.1 "SunyLine 4xHub" and it works! Firmware: /vusb-20100715/examles/hid-custom-rq lsusb shows: Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 0...