View detail for AVR527: Migrating from ATmega164P/324P/644P to ATmega164PA/324PA/644PA

AVR527: Migrating from
ATmega164P/324P/644P to
ATmega164PA/324PA/644PA
8-bit
Microcontrollers
1 Introduction
In order to optimize the manufacturing process and to further reduce current
consumption, an optimized version of ATmega164P/324P/644P has been
introduced.
Application Note
The ATmega164PA/324PA/644PA is a functionally identical, drop-in replacement
for the ATmega164P/324P/644P. 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.
ATmega164P/324P/644P and ATmega164PA/324PA/644PA 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 ATmega164PA/324PA/644PA 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
ATmega164PA/324PA/644PA datasheet.
Rev. 8190C-AVR-08/09
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
Condition
ATmega164P
ATmega164PA
Change
VCC=2V, f=1 MHz
0.4 mA
0.3 mA
- 25%
VCC=3V , f=4 MHz
2.1 mA
1.4 mA
- 33%
VCC=5V , f=8 MHz
7.4 mA
4.8 mA
- 35%
VCC=2V, f=1 MHz
0.1 mA
0.07 mA
- 30%
VCC=3V , f=4 MHz
0.5 mA
0.25 mA
- 50%
VCC=5V , f=8 MHz
1.9 mA
1 mA
- 47%
Table 2-2. Typical Current Consumption of Device at Room Temperature
Mode
Active
Idle
Condition
ATmega324P
ATmega324PA
Change
VCC=2V, f=1 MHz
0.42 mA
0.3 mA
- 29%
VCC=3V , f=4 MHz
2.4 mA
1.5 mA
- 38%
VCC=5V , f=8 MHz
8.0 mA
5.2 mA
- 35%
VCC=2V, f=1 MHz
0.13 mA
0.06 mA
- 54%
VCC=3V , f=4 MHz
0.6 mA
0.35 mA
- 42%
VCC=5V , f=8 MHz
2.3 mA
1.3 mA
- 43%
Table 2-3. Typical Current Consumption of Device at Room Temperature
Mode
Active
Idle
Condition
ATmega644P
ATmega644PA
Change
VCC=2V, f=1 MHz
0.41 mA
0.38 mA
- 7%
VCC=3V , f=4 MHz
2 mA
1.8 mA
-10%
VCC=5V , f=8 MHz
7.5 mA
5.6 mA
-25%
VCC=2V, f=1 MHz
0.1 mA
0.06 mA
-40%
VCC=3V , f=4 MHz
0.5 mA
0.2 mA
-60%
VCC=5V , f=8 MHz
1.6 mA
1.1m A
-31%
3 Signature Bytes
The table below summarizes the difference between the signature bytes of
ATmega324P and ATmega324PA. Note, that no change for ATmega164P/644P and
ATmega164PA/644PA.
2
AVR527
8190C-AVR-08/09
AVR527
Table 3-1. Device and JTAG ID
Signature Bytes Address
JTAG
Part
0x000
0x001
0x002
Part Number
Manufacture ID
ATmega324P
0x1E
0x95
0x08
9508
0x1F
ATmega324PA
0x1E
0x95
0x11
9511
0x1F
4 Datasheet Changes
For a summary of changes, see the datasheet revision history at the end of the
ATmega164PA/324PA/644PA datasheet.
3
8190C-AVR-08/09
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8190C-AVR-08/09