View detail for AVR521: Migrating from ATmega32 to ATmega32A

AVR521: Migrating from ATmega32 to
ATmega32A
8-bit
Microcontrollers
1 Introduction
Application Note
In order to optimize the manufacturing process and to further reduce current
consumption, an optimized version of ATmega32 has been introduced.
The ATmega32A is a functionally identical, drop-in replacement for the ATmega32.
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.
ATmega32 and ATmega32A 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 ATmega32A 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 ATmega32A
datasheet.
Rev. 8162A-AVR-06/08
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
ATmega32
ATmega32A
Change
VCC=3V, f=1 MHz
1.1 mA
0.6 mA
- 45%
VCC=5V , f=8 MHz
12 mA
7.5 mA
- 37%
VCC=3V, f=1 MHz
350 µA
220 µA
- 37%
VCC=5V , f=8 MHz
5.5 mA
2.8 mA
- 49%
VCC=3V, f=1 MHz
1.2 mA
0.9 mA
- 25%
VCC=5V , f=8 MHz
10 mA
7.8 mA
- 22%
2.2 Reset Pull-Up
Table 2-2 summarizes the differences between the reset pull-up of ATmega32 and
that of ATmega32A.
Table 2-2. Reset pull-up
ATmega32
Symbol
Min
RRST
30
Typ
ATmega32A
Unit
Max
Min
Typ
Max
60
30
60
85
kΩ
3 Datasheet Changes
For a summary of changes, see the datasheet revision history at the end of the
ATmega32A datasheet.
2
AVR521
8162A-AVR-06/08
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8162A-AVR-06/08