View detail for AVR524: Migration from ATmega64 to ATmega64A

AVR524: Migration from ATmega64 to
ATmega64A
8-bit
Microcontrollers
1 Introduction
Application Note
In order to optimize the manufacturing process and to further reduce current
consumption, an optimized version of ATmega64 has been introduced.
The ATmega64A is a functionally identical, drop-in replacement for the ATmega64.
All devices are subject to the same qualification process and same set of
production tests, but as the manufacturing process is not the same some electrical
characteristics differ.
ATmega64 and ATmega64A have separate datasheets. This application note
outlines the differences between the two devices and the datasheets. There is also
a detailed change log to assist the user at the end of the ATmega64A datasheet.
Remember to always use the latest revision of the device datasheet.
Minor differences in typical characteristics are not discussed in this document as
long as the low and high limits remain the same. For detailed information about the
typical characteristics, see sections “Electrical Characteristics” and “Typical
Characteristics” of the device datasheets.
Note: This application note serves as a guide to ease migration. For complete
device details, always refer to the most recent version of the ATmega64A
datasheet.
Rev. 8165A-AVR-03/09
2 Changes in Characteristics
This section outlines major differences in characteristics that may have an effect on
the application in which the device is used. For detailed information, refer to the most
recent version of the device datasheets.
2.1 Current Consumption
Active and Idle mode current consumption of the device has been reduced
significantly. The tables below present typical current consumption figures at room
temperature. All values are taken from device datasheets, unless otherwise noted.
Table 2-1. Typical Current Consumption of Device at Room Temperature
Mode
Active
Idle
Reset
Condition
ATmega64
ATmega64A
Change
VCC=3V, f=4 MHz
4.1 mA
2.5 mA
- 39%
VCC=5V , f=8 MHz
15,5 mA
9 mA
- 42%
VCC=3V, f=4 MHz
2 mA
0.7 mA
- 65%
VCC=5V , f=8 MHz
8 mA
2.8 mA
- 65%
VCC=3V, f=4 MHz
3 mA
2.5 mA
- 17%
VCC=5V , f=8 MHz
13 mA
7.8 mA
- 40%
2.2 VOL Levels
In Table 2-2 are listed differences in output low and high voltage levels.
Table 2-2. Changes to VOL and VOH Levels
Symbol
VOL
Parameter
Output Low Voltage
(Ports A - G)
Condition
ATmega64
ATmega64A
Units
Min
Max
Min
Max
IOL=20mA, VCC=5V
-
0.7
-
0.9
V
IOL=10mA, VCC=3V
-
0.5
-
0.6
V
3 Datasheet Changes
For a summary of changes, see the datasheet revision history at the end of the
ATmega64A datasheet.
2
AVR524
8165A-AVR-03/09
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8165A-AVR-03/09