How do you keep the digal and analog GND separate? The datasheet for AVR recommends to connect the VCC and AVCC of microcontroller to separate ground. How to do that? Thanks
Vcc and AVcc can’t be connected to ground. Filter AVcc as described in the data sheet.
leon_heller:
Vcc and AVcc can’t be connected to ground. Filter AVcc as described in the data sheet.
sorry that was a mistake. I look at the DS and get back to you.
leon_heller:
Vcc and AVcc can’t be connected to ground. Filter AVcc as described in the data sheet.
In the above originial question, the AVCC should have been AGND and the VCC should have been just GND.
Please see the following link, page 3, under the heading of 2.2 Analog supply. My question is how do you create two separate GND on pcb? Thanks
With the low-resolution ADCs on AVRs you don’t need separate grounds, just the filter for AVcc. I get good results that way.
It’s only if you already have a separate grounding scheme or plan on using it. It’s not really recommended to have separate grounds unless it’s actually necessary. If you search for ‘pcb split ground’ or ‘pcb analog ground’ you can find more info.