Confusion in selecting the ATmega328 IC for my Custom application design board

Using Arduino Microcontrollers
1

Hi Sir,
I found lot of Variant in the IC Atmega328 which leads to confusion to select the IC for my custom application Design using this ATmega328 IC. I found lot of Variant like:

In P-Dip package:
Atmega328P-PU
Atmega328P-U
Atmega328-PU
In TQFP Package: (Temperature : -40'c to 105'C)
Atmega328P-AN
Atmega328P-ANR
In TQFP Package:(Temperature: -40'C to 85'C)
Atmega328P-AU
Atmega328P-AUR
In TQFP Package (PB Series):(Temp: -40 to 105'C)
Atmega328PB- AN
Atmega328PB-ANR
In TQFP Package (PB Series):(Temp: -40 to 85'C)
Atmega328PB- AU
Atmega328PB-AUR

Kindly guide me to select which is the running Model and which is the obsolete Part number to design my custom application board using the ATmega328 IC.
I am using Aruduino UNO board which i was working have Atmega328P-PU (28 Pin P-DIP Package). Kindly guide me to select the IC Part.

2

The PB series are the new ones, the others are NRND (Not Recommended for New Designs)

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3

Hi Sir, Thanks for the reply. We have PDIP Package in PB series? Kindly let us know.

4

No.

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5

Hi Sir. Thanks for the reply. Kindly share the official Circuit for Atmega328PB-AU or Atmega328PB-AN (TQFP Package). Kindly do the needful.

6

There is no official circuit.
The datasheet is available on the Microchip website, search for ATmega328PB

3 Likes
7

Hi Sir, Thanks for the reply. With the reference Circuit of Atmega328P-PU (28 Pin P-Dip Package) used in Arduino UNO Circuit. We will design for the ATMega328PB? Same Functionality in the Pins like SPI, I2C, Usart, External interrupts, ADC pins. To program the chip, Serial to USB convertor using ATmega16U2. To directly download the Program through ICSP Port into the chip Atmega328PB? I have the Circuit of Arduino UNO board with me. The same can be done using this chip?

8

The DIP is 28 pins, the TQFP has 32 pins. The PB has a different pinout.

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9

Developing the Software code in Arduino UNO board using arduino IDE for the ATmega328P-PU IC. Only change is to route the Pins according to the PB series Atmega328 Pinout in the custom board to be done? am i right sir.?

10

No.
You need to install MiniCore to be able to compile programs for the 328PB

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11

While the PB is the new version, it is currently not used in any Arduino boards, is not available in DIP, and is not quite pin-compatible with the 328P in the SMT packages. It is very similar to the 328P in terms of software - it has some added features, but those need not be visible if you don't use them. (The problem is that many of the "new features" added to the PB use the extra 4 pins available on the SMT package.)

Yes, this means that THE most popular chip used in Arduinos has been delegated by the manufacturer to becoming obsolete. :frowning:
(Although, just because the chip is NRND doesn't mean it's likely to disappear from the market anytime soon. Microchip has a long history of keeping around "old" chips nearly forever. They just get embarrassingly more expensive than the newer generation. (eg you can still buy PIC16F84A chips (the first flash-based microcontroller to hit the hobbyist market.) They're just 3x the price ($6) of a more modern chip with better features.))

The most likely replacement AVR in 28-pin DIP is probably the AVR-DA series, or maybe the AVR-EA. For about the same prices as a 328p, you get a chip with more memory and more advanced peripherals. Alas, it is also not used in any official Arduino Board (although it software-similar to the ATmeg4809 used on Uno WiFi 2 and Nano Every.)

The 328PB is supported by MCUDude's "minicore"
the AVR-DA series is supported by Spence Konde's "DxCore"

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12

Hi sir, The speed of the Atmega328PB Series will as same as Atmega328P. Is there any difference in speed performance? That is, 20MHz for External Oscillator and can use Atmega328PB Series with 8Mhz Internal oscillator?

I found this discussion in the forum:

13

Many of the Arduino functions like delay, analogWrite, Serial, etc. rely on the clock being at 16MHz.

They won't work properly at other frequencies for both the 328P and 328PB

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14

Hi sir. Thanks for the reply. Ok. Either i can use the External Oscillator 16 MHZ or Internal Oscillator 8 MHz in Atmega328PB works for all arduino functions. For internal Oscillator 8 MHz, Arduino Function will work? kindly let us know.

15

No.

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16

Hi sir, Thanks for the reply. Then i will use 16MHz External Crystal for Atmega328PB. Will this 16 MHZ crystal applicable for Atmega 2560 IC also to work with arduino functions? Kindly let us know.

17

Yes

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18

I have no experience with the 328PB. But to my knowledge it should work with 8 MHz internal. You can select the settings when installing Minicore as already mentioned by @jim-p in post #10.

Underlined the two speed options that you indicated as well as the selected board.

image
image574×788 38.9 KB

Maybe I'm missing the point of the question?

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19

I don't think so.
However I not sure what @prakashvenugopal ultimate goal is.
We have discussed 328P, 328PB, and now the 2560,

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20

I use the 328P, in the DIL package, to experiment on the breadboard.

For all my own boards I use the 328PB. I need the extra pins and the additional I2C port for some designs. The PB is (at least was) cheaper than the P.

I clock both externally with 16MHz crystal and program them, using "MiniCore", via ISP using a home made programmer based on the 32U4 and "Arduino as ISP". All code, apart from extra pins and ports, are 100% compatible between them.

I never used the 2560 so cannot comment on it.

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