8-bit AVR Microcontrollers ATmega644PA DATASHEET SUMMARY Introduction ® The Atmel ATmega644PA is a low-power CMOS 8-bit microcontroller based on the AVR® enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega644PA achieves throughputs close to 1MIPS per MHz. This empowers system designer to optimize the device for power consumption versus processing speed. Feature High Performance, Low Power Atmel®AVR® 8-Bit Microcontroller Family • Advanced RISC Architecture – 131 Powerful Instructions – Most Single Clock Cycle Execution – 32 x 8 General Purpose Working Registers – Fully Static Operation – Up to 20 MIPS Throughput at 20MHz – On-chip 2-cycle Multiplier • High Endurance Non-volatile Memory Segments – 64KBytes of In-System Self-Programmable Flash Program Memory – 2KBytes EEPROM – 4KBytes Internal SRAM – Write/Erase Cycles: 10,000 Flash/100,000 EEPROM – Data Retention: 20 Years at 85°C/100 Years at 25°C(1) – Optional Boot Code Section with Independent Lock Bits • In-System Programming by On-chip Boot Program • True Read-While-Write Operation – Programming Lock for Software Security • Atmel QTouch® Library Support – Capacitive Touch Buttons, Sliders and Wheels – QTouch and QMatrix acquisition – Up to 64 Sense Channels Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 • • JTAG (IEEE std. 1149.1 Compliant) Interface – Boundary-scan Capabilities According to the JTAG Standard – Extensive On-chip Debug Support – Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface Peripheral Features – Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode – One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode – Real Time Counter with Separate Oscillator – – • • • • • Six PWM Channels 8-channel 10-bit ADC • Differential Mode with Selectable Gain at 1×, 10× or 200× – One Byte-oriented 2-wire Serial Interface (Philips I2C compatible) – Two Programmable Serial USART – One Master/Slave SPI Serial Interface – Programmable Watchdog Timer with Separate On-chip Oscillator – On-chip Analog Comparator – Interrupt and Wake-up on Pin Change Special Microcontroller Features – Power-on Reset and Programmable Brown-out Detection – Internal Calibrated RC Oscillator – External and Internal Interrupt Sources – Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby I/O and Packages – 32 Programmable I/O Lines – 40-pin PDIP – 44-lead TQFP – 44-pad VQFN/QFN Operating Voltage: – 1.8 - 5.5V Speed Grades – 0 - 4MHz @ 1.8V - 5.5V – 0 - 10MHz @ 2.7V - 5.5V – 0 - 20MHz @ 4.5 - 5.5V Power Consumption at 1MHz, 1.8V, 25°C – Active Mode: 0.4mA – Power-down Mode: 0.1μA – Power-save Mode: 0.6μA (Including 32kHz RTC) Note: 1. Refer to Data Retention Related Links Data Retention on page 12 Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 2 1. Description The Atmel® ATmega644PA is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega644PA achieves throughputs close to 1MIPS per MHz. This empowers system designer to optimize the device for power consumption versus processing speed. The Atmel AVR® core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in a single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers. The ATmega644PA provides the following features: 64Kbytes of In-System Programmable Flash with Read-While-Write capabilities, 2Kbytes EEPROM, 4Kbytes SRAM, 32 general purpose I/O lines, 32 general purpose working registers, Real Time Counter (RTC), three flexible Timer/Counters with compare modes and PWM, two serial programmable USARTs , one byte-oriented 2-wire Serial Interface (I2C), a 8channel 10-bit ADC with optional differential input stage with programmable gain, a programmable Watchdog Timer with internal Oscillator, an SPI serial port, IEEE std. 1149.1 compliant JTAG test interface, also used for accessing the On-chip Debug system and programming and six software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and interrupt system to continue functioning. The Power-down mode saves the register contents but freezes the Oscillator, disabling all other chip functions until the next interrupt or hardware reset. In Power-save mode, the asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except asynchronous timer and ADC to minimize switching noise during ADC conversions. In Standby mode, the crystal/resonator oscillator is running while the rest of the device is sleeping. This allows very fast start-up combined with low power consumption. In Extended Standby mode, both the main oscillator and the asynchronous timer continue to run. Atmel offers the QTouch® library for embedding capacitive touch buttons, sliders and wheels functionality into AVR microcontrollers. The patented charge-transfer signal acquisition offers robust sensing and includes fully debounced reporting of touch keys and includes Adjacent Key Suppression® (AKS™) technology for unambiguous detection of key events. The easy-to-use QTouch Suite toolchain allows you to explore, develop and debug your own touch applications. The device is manufactured using Atmel’s high density non-volatile memory technology. The On-chip ISP Flash allows the program memory to be reprogrammed In-System through an SPI serial interface, by a conventional nonvolatile memory programmer, or by an On-chip Boot program running on the AVR core. The Boot program can use any interface to download the application program in the Application Flash memory. Software in the Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-While-Write operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a monolithic chip, the Atmel ATmega644PA is a powerful microcontroller that provides a highly flexible and cost effective solution to many embedded control applications. The ATmega644PA is supported with a full suite of program and system development tools including: C Compilers, Macro Assemblers, Program Debugger/Simulators, In-Circuit Emulators, and Evaluation kits. Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 3 2. Configuration Summary The table below compares the device series of feature and pin compatible devices, providing a seamless migration path. Table 2-1. Configuration Summary and Device Comparison Features ATmega164PA ATmega324PA ATmega644PA ATmega1284P Pin Count 40/44/49 40/44/49 40/44 40/44 Flash (Bytes) 16K 32K 64K 128K SRAM (Bytes) 1K 2K 4K 16K EEPROM (Bytes) 512 1K 2K 4K General Purpose I/O Lines 32 32 32 32 SPI 1 1 1 1 TWI (I2C) 1 1 1 1 USART 2 2 2 2 10-bit 15ksps 10-bit 15ksps 10-bit 15ksps 10-bit 15ksps ADC Channels 8 8 8 8 Analog Comparator 1 1 1 1 8-bit Timer/ Counters 2 2 2 2 16-bit Timer/ Counters 1 1 1 2 PWM channels 6 6 6 8 PDIP PDIP PDIP PDIP TQFP TQFP TQFP TQFP VQFN/QFN VQFN/QFN VQFN/QFN VQFNQFN DRQFN DRQFN VFBGA VFBGA ADC Packages Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 4 3. Ordering Information Speed [MHz](3) Power Supply [V] 20 1.8 - 5.5 20 1.8 - 5.5 Ordering Code(2) Package(1) Operational Range ATmega644PA-AU 44A Industrial (-40°C to 85°C) ATmega644PA-AUR(4) 44A ATmega644PA-PU 40P6 ATmega644PA-MU 44M1 ATmega644PA-MUR(4) 44M1 ATmega644PA-AN 44A ATmega644PA-ANR(4) 44A ATmega644PA-PN 40P6 ATmega644PA-MN 44M1 ATmega644PA-MNR(4) 44M1 Industrial (-40°C to 105°C) Note: 1. This device can also be supplied in wafer form. Please contact your local Atmel sales office for detailed ordering information and minimum quantities. 2. Pb-free packaging, complies to the European Directive for Restriction of Hazardous Substances (RoHS directive). Also Halide free and fully Green. 3. Refer to Speed Grades for Speed vs. VCC 4. Tape & Reel. Package Type 40P6 40-pin, 0.600” Wide, Plastic Dual Inline Package (PDIP) 44A 44-lead, Thin (1.0mm) Plastic Quad Flat Package (TQFP) 44M1 44-pad, 7 × 7 × 1.0mm body, lead pitch 0.50mm, Thermally Enhanced Plastic Very Thin Quad Flat NoLead (VQFN) Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 5 4. Block Diagram Figure 4-1. Block Diagram SRAM TCK TMS TDI TDO JTAG CPU OCD Clock generation TOSC1 32.768kHz XOSC TOSC2 XTAL1 16MHz LP XOSC XTAL2 VCC RESET GND 8MHz Calib RC 128kHz int osc External clock Power Supervision POR/BOD & RESET ADC[7:0] AREF PCINT[31:0] INT[2:0] OC1A/B T1 ICP1 OC2A OC2B NVM programming Power management and clock control Watchdog Timer ADC EXTINT TC 1 (16-bit) TC 2 (8-bit async) FLASH D A T A B U S I/O PORTS I N / O U T EEPROM GPIOR[2:0] D A T A B U S EEPROMIF TC 0 (8-bit) SPI AC Internal Reference USART 0 RxD0 TxD0 XCK0 USART 1 RxD1 TxD1 XCK1 TWI PA[7:0] PB[7:0] PC[7:0] PD[7:0] T0 OC0A OC0B MISO MOSI SCK SS AIN0 AIN1 ACO ADCMUX SDA SCL Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 6 5. Pin Configurations 5.1. Pinout 5.1.1. PDIP (PCINT8/XCK0/T0) (ADC0/PCINT0) (PCINT9/CLKO/T1) (ADC1/PCINT1) (PCINT10/INT2/AIN0) (ADC2/PCINT2) (PCINT11/OC0A/AIN1) (ADC3/PCINT3) (PCINT12/OC0B/ (ADC4/PCINT4) (PCINT13/MOSI) (ADC5/PCINT5) (PCINT14/MISO) (ADC6/PCINT6) (PCINT15//SCK) (ADC7/PCINT7) (TOSC2/PCINT23) (TOSC1/PCINT22) (PCINT24/RXD0) (TDI/PCINT21) (PCINT25/TXD0) (TDO/PCINT20) (PCINT26/RXD1/INT0) (TMS/PCINT19) (PCINT27/TXD1/INT1) (TCK/PCINT18) (PCINT28/XCK1/OC1B) (SDA/PCINT17) (PCINT29/OC1A) (SCL/PCINT16) (PCINT30/OC2B/ICP) (OC2A/PCINT31) Power Ground Programming/debug Digital Analog Crystal/Osc Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 7 PB1 (T1/CLKO/PCINT9) PB0 (XCK0/T0/PCINT8) GND VCC PA0 (ADC0/PCINT0) PA1 (ADC1/PCINT1) PA2 (ADC2/PCINT2) PA3 (ADC3/PCINT3) 41 40 39 38 37 36 35 34 Crystal/Osc PB2 (AIN0/INT2/PCINT10) Analog 42 Digital PB3 (AIN1/OC0A/PCINT11) Programming/debug 43 Ground PB4 (SS/OC0B/PCINT12) Power 44 TQFN and QFN GND XTAL2 7 27 AVCC XTAL1 8 26 PC7 (TOSC2/PCINT23) (PCINT24/RXD0) PD0 9 25 PC6 (TOSC1/PCINT22) (PCINT25/TXD0) PD1 10 24 PC5 (TDI/PCINT21) (PCINT26/RXD1/INT0) PD2 11 23 PC4 (TDO/PCINT20) 22 28 (PCINT19/TMS) PC3 6 21 GND (PCINT18/TCK) PC2 AREF 20 29 (PCINT17/SDA) PC1 5 19 VCC (PCINT16/SCL) PC0 PA7 (ADC7/PCINT7) 18 30 GND 4 17 RESET VCC PA6 (ADC6/PCINT6) 16 31 (PCINT31/OC2A) PD7 3 15 (PCINT15/SCK) PB7 (PCINT30/OC2B/ICP1) PD6 PA5 (ADC5/PCINT5) 14 (PCINT14/MISO) PB6 32 (PCINT29/OC1A) PD5 PA4 (ADC4/PCINT4) 2 13 33 (PCINT28/XCK1/OC1B) PD4 1 12 (PCINT13/MOSI) PB5 (PCINT27/TXD1/INT1) PD3 5.1.2. 5.2. Pin Descriptions 5.2.1. VCC Digital supply voltage. 5.2.2. GND Ground. 5.2.3. Port A (PA[7:0]) This port serves as analog inputs to the Analog-to-digital Converter. Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 8 This is an 8-bit, bi-directional I/O port with internal pull-up resistors, individually selectable for each bit. The output buffers have symmetrical drive characteristics, with both high sink and source capability. As inputs, the port pins that are externally pulled low will source current if pull-up resistors are activated. Port pins are tri-stated when a reset condition becomes active, even if the clock is not running. 5.2.4. Port B (PB[7:0]) This is an 8-bit, bi-directional I/O port with internal pull-up resistors, individually selectable for each bit. The output buffers have symmetrical drive characteristics, with both high sink and source capability. As inputs, the port pins that are externally pulled low will source current if pull-up resistors are activated. Port pins are tri-stated when a reset condition becomes active, even if the clock is not running. This port also serves the functions of various special features. 5.2.5. Port C (PC[7:0]) This is an 8-bit, bi-directional I/O port with internal pull-up resistors, individually selectable for each bit. The output buffers have symmetrical drive characteristics, with both high sink and source capability. As inputs, the port pins that are externally pulled low will source current if pull-up resistors are activated. Port pins are tri-stated when a reset condition becomes active, even if the clock is not running. This port also serves the functions of the JTAG interface, along with special features. 5.2.6. Port D (PD[7:0]) This is an 8-bit, bi-directional I/O port with internal pull-up resistors, individually selectable for each bit. The output buffers have symmetrical drive characteristics, with both high sink and source capability. As inputs, the port pins that are externally pulled low will source current if pull-up resistors are activated. Port pins are tri-stated when a reset condition becomes active, even if the clock is not running. This port also serves the functions of various special features. 5.2.7. RESET Reset input. A low level on this pin for longer than the minimum pulse length will generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset. 5.2.8. XTAL1 Input to the inverting Oscillator amplifier and input to the internal clock operating circuit. 5.2.9. XTAL2 Output from the inverting Oscillator amplifier. 5.2.10. AVCC AVCC is the supply voltage pin for Port A and the Analog-to-digital Converter. It should be externally connected to VCC, even if the ADC is not used. If the ADC is used, it should be connected to VCC through a low-pass filter. 5.2.11. AREF This is the analog reference pin for the Analog-to-digital Converter. Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 9 6. I/O Multiplexing Each pin is by default controlled by the PORT as a general purpose I/O and alternatively it can be assigned to one of the peripheral functions. The following table describes the peripheral signals multiplexed to the PORT I/O pins. Table 6-1. PORT Function Multiplexing 32-pin 40-pin TQFP/ PIPD QFN/ Pin # MLF Pin # DRQFN Pin# VFBGA Pin# PAD EXTINT PCINT ADC/AC OSC T/C # 0 T/C # 1 USART I2C SPI JTAG 1 6 A1 B2 PB PCINT1 3 MOSI 2 7 B1 B1 PB PCINT1 4 MISO 3 8 A2 C3 PB PCINT1 5 SCK 4 9 B2 C2 RESET 5 10 A3 A5 VCC 6 11 B3 A1 GND 7 12 A4 D2 XTAL2 8 13 B4 E1 XTAL1 9 14 A5 D3 PD PCINT2 4 RxD0 10 15 B5 E2 PD PCINT2 5 TxD0 11 16 A6 F1 PD INT0 PCINT2 6 RxD1 12 17 A7 F2 PD INT1 PCINT2 7 TXD1 13 18 B6 G2 PD PCINT2 8 OC1B 14 19 A8 E3 PD PCINT2 9 OC1A 15 20 B7 F3 PD PCINT3 0 OC2B 16 21 A9 E4 PD PCINT3 1 OC2A 17 - B8 C1 VCC RxD2 MISO1 18 - A10 A4 GND TxD2 MOSI1 19 22 B9 F4 PC PCINT1 6 SCL 20 23 A11 G5 PC PCINT1 7 SDA 21 24 B10 F5 PC PCINT1 8 TCK 22 25 A12 G6 PC PCINT1 9 TMS 23 26 A13 F6 PC PCINT2 0 TDO XCK1 ICP1 Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 10 32-pin 40-pin TQFP/ PIPD QFN/ Pin # MLF Pin # DRQFN Pin# VFBGA Pin# PAD EXTINT PCINT ADC/AC OSC T/C # 0 T/C # 1 USART I2C 24 27 B11 E5 PC PCINT2 1 25 28 A14 F7 PC PCINT2 2 TOSC1 26 29 B12 E6 PC PCINT2 3 TOSC2 27 30 A15 E7 AVCC 28 31 B13 D1 GND 29 32 A16 C7 AREF 30 33 B14 D6 PA PCINT7 ADC7 31 34 A17 C6 PA PCINT6 ADC6 32 35 B15 B7 PA PCINT5 ADC5 33 36 A18 D5 PA PCINT4 ADC4 34 37 A19 B6 PA PCINT3 ADC3 35 38 B16 A6 PA PCINT2 ADC2 36 39 A20 C5 PA PCINT1 ADC1 37 40 B17 B5 PA PCINT0 ADC0 38 - A21 G3 VCC SDA1 39 - B18 A7 GND SCL1 40 1 A22 B4 PB PCINT8 41 2 B19 C4 PB PCINT9 42 3 A23 A3 PB 43 4 B20 B3 44 5 A24 - - - SPI JTAG TDI AREF INT2 T0 XCK0 CLKO PCINT1 0 AIN0 PB PCINT1 1 AIN1 A2 PB PCINT1 2 - D4 GND - - D7 GND - - G1 GND - - - G4 GND - - - G7 GND T1 OC0A OC0B SS Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 11 7. General Information 7.1. Resources A comprehensive set of development tools, application notes, and datasheets are available for download on http://www.atmel.com/avr. 7.2. Data Retention Reliability Qualification results show that the projected data retention failure rate is much less than 1 PPM over 20 years at 85°C or 100 years at 25°C. 7.3. About Code Examples This documentation contains simple code examples that briefly show how to use various parts of the device. These code examples assume that the part specific header file is included before compilation. Be aware that not all C compiler vendors include bit definitions in the header files and interrupt handling in C is compiler dependent. Confirm with the C compiler documentation for more details. For I/O Registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”, and “SBI” instructions must be replaced with instructions that allow access to extended I/O. Typically “LDS” and “STS” combined with “SBRS”, “SBRC”, “SBR”, and “CBR”. 7.4. Capacitive Touch Sensing 7.4.1. QTouch Library ® ® The Atmel QTouch Library provides a simple to use solution to realize touch sensitive interfaces on ® most Atmel AVR microcontrollers. The QTouch Library includes support for the Atmel QTouch and Atmel ® QMatrix acquisition methods. Touch sensing can be added to any application by linking the appropriate Atmel QTouch Library for the AVR Microcontroller. This is done by using a simple set of APIs to define the touch channels and sensors, and then calling the touch sensing API’s to retrieve the channel information and determine the touch sensor states. The QTouch Library is FREE and downloadable from the Atmel website at the following location: http:// www.atmel.com/technologies/touch/. For implementation details and other information, refer to the Atmel QTouch Library User Guide - also available for download from the Atmel website. Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 12 8. Packaging Information 8.1. 40-pin PDIP D PIN 1 E1 A SEATING PLANE A1 L B B1 e E 0º ~ 15º C COMMON DIMENSIONS (Unit of Measure = mm) REF eB Notes: 1. This package conforms to JEDEC reference MS-011, Variation AC. 2. Dimensions D and E1 do not include mold Flash or Protrusion. Mold Flash or Protrusion shall not exceed 0.25mm (0.010"). SYMBOL MIN NOM MAX A – – 4.826 A1 0.381 – – D 52.070 – 52.578 E 15.240 – 15.875 E1 13.462 – 13.970 B 0.356 – 0.559 B1 1.041 – 1.651 L 3.048 – 3.556 C 0.203 – 0.381 eB 15.494 – 17.526 e NOTE Note 2 Note 2 2.540 TYP 13/02/2014 40P6, 40-lead (0.600"/15.24mm Wide) Plastic Dual Inline Package (PDIP) C 40P6 Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 13 8.2. 44-pin TQFP P IN 1 IDENTIFIER P IN 1 B e E1 E A1 A2 D1 D C 0°~7° L A COMMON DIMENS IONS (Unit of Me a s ure = mm) Note s : 1. This pa cka ge conforms to J EDEC re fe re nce MS -026, Va ria tion ACB. 2. Dime ns ions D1 a nd E1 do not include mold protrus ion. Allowa ble protrus ion is 0.25mm pe r s ide . Dime ns ions D1 a nd E1 a re ma ximum pla s tic body s ize dime ns ions including mold mis ma tch. 3. Le a d copla na rity is 0.10mm ma ximum. S YMBOL MIN NOM MAX A – – 1.20 A1 0.05 – 0.15 A2 0.95 1.00 1.05 D 11.75 12.00 12.25 D1 9.90 10.00 10.10 E 11.75 12.00 12.25 E1 9.90 10.00 10.10 B 0.30 0.37 0.45 C 0.09 (0.17) 0.20 L 0.45 0.60 0.75 e NOTE Note 2 Note 2 0.80 TYP 06/02/2014 44A, 44-le a d, 10 x 10mm body s ize , 1.0mm body thickne s s , 0.8 mm le a d pitch, thin profile pla s tic qua d fla t pa cka ge (TQFP ) 44A Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 C 14 8.3. 44-pin VQFN D Marked Pin# 1 I D E SE ATING PLANE A1 TOP VIEW A3 A K L Pin #1 Co rne r D2 1 2 3 Option A SIDE VIEW Pin #1 Triangl e COMMON DIMENSIONS (Unit of Measure = mm) MIN NOM MAX A 0.80 0.90 1.00 A1 – 0.02 0.05 SYMBOL E2 Option B K Option C b e Pin #1 Cham fe r (C 0.30) Pin #1 Notch (0.20 R) BOTTOM VIEW A3 0.20 REF b 0.18 0.23 D 6.90 7.00 7.10 D2 5.00 5.20 5.40 E 6.90 7.00 7.10 E2 5.00 5.20 5.40 e Note : JEDEC Standard MO-220, Fig . 1 (S AW Singulation) VKKD-3 . NOTE 0.30 0.50 BSC L 0.59 0.64 0.69 K 0.20 0.26 0.41 9/26/08 Package Drawing Contact: [email protected] TITLE 44M1, 44-pad, 7 x 7 x 1.0mm body, lead pitch 0.50mm, 5.20mm exposed pad, thermally enhanced plastic very thin quad flat no lead package (VQFN) GPC ZWS DRAWING NO. REV. 44M1 H Atmel ATmega644PA [DATASHEET] Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 15 Atmel Corporation © 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200 | www.atmel.com 2016 Atmel Corporation. / Rev.: Atmel-42717A-ATmega644PA_Datasheet_Summary-05/2016 ® ® ® Atmel , Atmel logo and combinations thereof, Enabling Unlimited Possibilities , AVR , and others are registered trademarks or trademarks of Atmel Corporation in U.S. and other countries. Other terms and product names may be trademarks of others. DISCLAIMER: The information in this document is provided in connection with Atmel products. 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