Timeline for Use LED instead of Zener
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 4, 2017 at 14:55 | comment | added | Ale..chenski | @frarugi87, thanks for the clarification, duly noted. | |
| Sep 4, 2017 at 10:07 | comment | added | frarugi87 | @AliChen in fact skipping the 3.3V regulator is not used because of speed issues (the attiny does not support 16.5MHz at 3.3V, only at 5V; the first versions using an attiny2313 used it out of specs - 12MHz @ 3.3V is not supported) | |
| Sep 1, 2017 at 20:44 | comment | added | Ale..chenski | Olin, This is an example of bit-banging low-speed USB, where computing enthusiasts skipped even on 3.3V regulator. So the GPIO pins are running from 5-V rail, and therefore 3.3V clipping is needed. One shouldn't confuse this ATtiny with PIC18, where they have a dedicated USB PHY bonded to dedicated pins, all perfectly certifiable to USB standards. | |
| Sep 1, 2017 at 20:10 | history | answered | Olin Lathrop | CC BY-SA 3.0 |