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 Disclaimer Headquarters International Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Atmel Asia Unit 1-5 & 16, 19/F BEA Tower, Millennium City 5 418 Kwun Tong Road Kwun Tong, Kowloon Hong Kong Tel: (852) 2245-6100 Fax: (852) 2722-1369 Atmel Europe Le Krebs 8, Rue Jean-Pierre Timbaud BP 309 78054 Saint-Quentin-enYvelines Cedex France Tel: (33) 1-30-60-70-00 Fax: (33) 1-30-60-71-11 Atmel Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Technical Support [email protected] Sales Contact www.atmel.com/contacts Product Contact Web Site www.atmel.com/ Literature Request www.atmel.com/literature Disclaimer: The information in this document is provided in connection with Atmel products. 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