Marking microcontrollers

Question

Do it yourself

Good afternoon.

Interested in information on decoding microcontrollers.
For example:
ATMEGA88PA-AU 1016

MEGA - basic version
88 - maximum frequency
PA - low-power versions and reduced current consumption
AU - TQFP package, lead-free solder aux
. information to the microcontroller, the following information is also indicated:
QFP - socket type
32 - number of legs
on the top, do I understand correctly?

there are still numbers on the microcontroller itself: 1030, 1016, or 1103, and there are still different ones ... What are these numbers?

There is also a marking of this type:
ATMEGA88-20AU 0634
From this entry, I do not understand the number 20 and the last four-digit number.

Answer 1

ATMEGA88PA-AU 1016
AT - manufacturer code (Atmel)
MEGA - controller series
88 - model. The first eight is the amount of flash memory, there are also 48, 168, 328
P - picoPower technology (reduced power consumption)
A - expanded peripherals (compared to the version without the letter A), PWM channels, timer modes, more little things have been added. Mega88A is backward compatible with mega88.
A - package code (TQFP)
U - tinned leads (sometimes MH - nickel-palladium-gold coating)
QFP32 - human name of the package
The last 4 digits are the batch number. Theoretically, it can be used to find out the revision of the controller (see the Errata section in the datasheet).
ATMEGA88-20AU 0634
20 is the maximum clock frequency. There is also mega88L-10 - the frequency is lower, but the supply voltage range is wider. For new controllers (mega88A) this marking is not used, they all work in the full voltage range, they do not have division into speed grades (-/L/V)

Answer 2

Usually an explanation of the marking is in the datasheet.