The meaning of the AVR MCU suffix-EEWORLD

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Take ATmega169 as an example:

The ATmega169 TQFP package currently has the following main models: ATmega169V-8AU, ATmega169V-8AI, ATmega169-16AU, ATmega169-16AI.

Model identification description:

(1) The difference between the ones with "V" and those without "V": The ones with "V" support a voltage range of 1.8-5.5V. The ones without "V" support a voltage range of 2.7-5.5V.

(2) The number in the suffix represents the highest system clock that the MCU can support. For example, ATmega169V-8AU and ATmega169V-8AI can support a system clock of 8 MHZ. ATmega169-16AU and ATmega169-16AI can support a system clock of 16 MHZ.

(3) The first letter of the suffix represents the package type of the MCU. “P” represents DIP package and “A” represents TQFP package.

For example, ATmega169V-8AI and ATmega169V-8AU indicate that it is a TQFP package.

(4) The second letter of the suffix represents the application level of the MCU. “C” stands for commercial level, while “I” and “U” stand for industrial level.

For example, ATmega169V-8AC with "C" is commercial grade, and ATmega169V-8AI with "I" is industrial grade. It should be noted that due to the current European and American requirements for the use of lead-free ICs, ATMEL will only launch AVR MCUs with "U" in the future, which will replace the original models with "I", such as ATmega169V-8AU will replace the original ATmega169V-8AI.

Keywords：AVR ATmega169 Reference address：The meaning of the AVR MCU suffix

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