ATMEGA64-16AU - 8-bit AVR MCU 64KB Flash 16MHz | Microchip
MPN: ATMEGA64-16AU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.3 | $11.30 |
| 10 | $10.17 | $101.70 |
| 100 | $9.04 | $904.00 |
| 500 | $8.14 | $4,070.00 |
| 1,000 | $7.23 | $7,230.00 |
ATMEGA64-16AU Overview
An AVR microcontroller is a single-chip computer built on the enhanced RISC architecture originally developed by Atmel (now Microchip Technology). It integrates CPU, non-volatile program memory, data memory, and peripherals such as timers, serial interfaces, and analog-to-digital converters on one die. In the product hierarchy, the ATmega64 sits within the AVR 8-bit MCU family, which belongs to the broader microcontroller category under embedded processing semiconductors.
Key features include 64 KB Flash with Read-While-Write capability, 4 KB internal SRAM, 2 KB EEPROM, a real-time counter (RTC), four flexible timer/counters with compare modes and PWM, two USARTs, a byte-oriented Two-wire serial interface, and an 8-channel 10-bit ADC. The device supports both 5V and 3.3V operation and offers six sleep modes for power-sensitive designs.
The ATmega64 is 100% pin compatible with the legacy ATmega103, allowing direct replacement on existing printed circuit boards. Its JTAG interface supports IEEE 1149.1 boundary-scan and on-chip debug, while the self-programming Flash enables in-system firmware updates without removing the device from the board.
Typical applications include industrial automation controllers, motor control, sensor hubs, building automation nodes, battery-powered instrumentation, and legacy ATmega103 board upgrades. The 53 I/O lines and dual USARTs make it well suited to multi-interface gateway designs.
When designing with the ATMEGA64-16AU, decouple every VCC pin with a 100 nF ceramic capacitor placed close to the pin, and use a low-ESR crystal with matched load capacitors on XTAL1/XTAL2 for reliable 16 MHz operation. Keep the analog AVCC supply filtered through a ferrite bead for ADC accuracy.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for selection, replacement, and layout decisions.
Drop-in alternatives for ATMEGA64-16AU β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA64-16AU (same form factor and footprint) β differing in Package, Operating Temperature, RoHS Status, EEPROM, ADC.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA64-16AUR
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA64-16AC
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA64L-8AU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA128-16AU
β Drop-Inβ In Stock
$14.3 / Unit
View Datasheet βATMEGA128-16AUR
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA64A-AU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA64-16AU Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Program Memory Size | 64 KB Flash (32K x 16) |
| Flash Endurance | 10,000 write/erase cycles |
| SRAM | 4 KB |
| EEPROM | 2 KB |
| Maximum CPU Speed | 16 MHz |
| Throughput | Up to 16 MIPS at 16 MHz |
| General Purpose I/O Pins | 53 |
| General Purpose Working Registers | 32 |
| Operating Voltage | 4.5 V to 5.5 V (16 MHz); 2.7 V to 5.5 V (8 MHz) |
| Timer/Counters | 4 (two 8-bit, two 16-bit) with compare modes and PWM |
| USART Interfaces | 2 |
| Two-wire Serial Interface | 1 (byte oriented) |
| ADC | 8-channel, 10-bit |
| Real Time Counter | Yes (RTC) |
| Package | 64-TQFP (14x14 mm, 0.8 mm pitch) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +85 C |
| RoHS Status | Compliant (GREEN) |
| JTAG Debug Interface | Yes (IEEE 1149.1 boundary-scan) |
ATMEGA64-16AU Pin Configuration
| Pin 1 | PE6/RXD0/INT6 β Port E bit 6 / USART0 receive / external interrupt 6 |
| Pin 2 | PE7/TXD0/INT7 β Port E bit 7 / USART0 transmit / external interrupt 7 |
| Pin 3 | PB0/SS/SCK β Port B bit 0 / SPI slave select / SPI clock |
| Pin 4 | PB1/MISO/OC0 β Port B bit 1 / SPI master-in slave-out / timer0 output compare |
| Pin 5 | PB2/MOSI/OC1B β Port B bit 2 / SPI master-out slave-in / timer1 output compare B |
| Pin 6 | PB3/OC2A β Port B bit 3 / timer2 output compare A |
| Pin 7 | PB4/OC2B β Port B bit 4 / timer2 output compare B |
| Pin 8 | PB5/OC1A β Port B bit 5 / timer1 output compare A |
| Pin 9 | PB6/OC1B β Port B bit 6 / timer1 output compare B |
| Pin 10 | PB7/OC0/OC2 β Port B bit 7 / timer0 and timer2 output compare |
| Pin 11 | TOSC2/PG3 β Timer oscillator pin 2 / port G bit 3 |
| Pin 12 | TOSC1/PG4 β Timer oscillator pin 1 / port G bit 4 |
| Pin 13 | RESET β Reset input (active low) |
| Pin 14 | VCC β Digital supply voltage |
| Pin 15 | GND β Ground |
| Pin 16 | XTAL2 β Crystal oscillator output |
| Pin 17 | XTAL1 β Crystal oscillator input / external clock |
| Pin 18 | PD0/SCL/INT0 β Port D bit 0 / Two-wire clock / external interrupt 0 |
| Pin 19 | PD1/SDA/INT1 β Port D bit 1 / Two-wire data / external interrupt 1 |
| Pin 20 | PD2/RXD1/INT2 β Port D bit 2 / USART1 receive / external interrupt 2 |
| Pin 21 | PD3/TXD1/INT3 β Port D bit 3 / USART1 transmit / external interrupt 3 |
| Pin 22 | PD4/IC1 β Port D bit 4 / timer1 input capture |
| Pin 23 | PD5/XCK1 β Port D bit 5 / USART1 external clock |
| Pin 24 | PD6/T1 β Port D bit 6 / timer1 external counter input |
| Pin 25 | PD7/T2 β Port D bit 7 / timer2 external counter input |
| Pin 26 | PC0/A8 β Port C bit 0 / ADC channel 8 |
| Pin 27 | PC1/A9 β Port C bit 1 / ADC channel 9 |
| Pin 28 | PC2/A10 β Port C bit 2 / ADC channel 10 |
| Pin 29 | PC3/A11 β Port C bit 3 / ADC channel 11 |
| Pin 30 | PC4/A12 β Port C bit 4 / ADC channel 12 |
| Pin 31 | PC5/A13 β Port C bit 5 / ADC channel 13 |
| Pin 32 | PC6/A14 β Port C bit 6 / ADC channel 14 |
| Pin 33 | PC7/A15 β Port C bit 7 / ADC channel 15 |
| Pin 34 | PG0/WR β Port G bit 0 / external memory write strobe |
| Pin 35 | PG1/RD β Port G bit 1 / external memory read strobe |
| Pin 36 | PG2/ALE β Port G bit 2 / external memory address latch enable |
| Pin 37 | PA7/AD7 β Port A bit 7 / external memory address/data bus |
| Pin 38 | PA6/AD6 β Port A bit 6 / external memory address/data bus |
| Pin 39 | PA5/AD5 β Port A bit 5 / external memory address/data bus |
| Pin 40 | PA4/AD4 β Port A bit 4 / external memory address/data bus |
| Pin 41 | PA3/AD3 β Port A bit 3 / external memory address/data bus |
| Pin 42 | PA2/AD2 β Port A bit 2 / external memory address/data bus |
| Pin 43 | PA1/AD1 β Port A bit 1 / external memory address/data bus |
| Pin 44 | PA0/AD0 β Port A bit 0 / external memory address/data bus |
| Pin 45 | VCC β Digital supply voltage |
| Pin 46 | GND β Ground |
| Pin 47 | PF7/ADC7/TDI β Port F bit 7 / ADC channel 7 / JTAG test data in |
| Pin 48 | PF6/ADC6/TDO β Port F bit 6 / ADC channel 6 / JTAG test data out |
| Pin 49 | PF5/ADC5/TMS β Port F bit 5 / ADC channel 5 / JTAG test mode select |
| Pin 50 | PF4/ADC4/TCK β Port F bit 4 / ADC channel 4 / JTAG test clock |
| Pin 51 | PF3/ADC3 β Port F bit 3 / ADC channel 3 |
| Pin 52 | PF2/ADC2 β Port F bit 2 / ADC channel 2 |
| Pin 53 | PF1/ADC1 β Port F bit 1 / ADC channel 1 |
| Pin 54 | PF0/ADC0 β Port F bit 0 / ADC channel 0 |
| Pin 55 | AREF β Analog reference voltage for ADC |
| Pin 56 | GND β Ground |
| Pin 57 | AVCC β Analog supply voltage for ADC |
| Pin 58 | PE2/ALE β Port E bit 2 / external memory address latch enable |
| Pin 59 | PE3/OC3A β Port E bit 3 / timer3 output compare A |
| Pin 60 | PE4/OC3B β Port E bit 4 / timer3 output compare B |
| Pin 61 | PE5/OC3C β Port E bit 5 / timer3 output compare C |
| Pin 62 | PE0/RXD0/INT8 β Port E bit 0 / USART0 receive / external interrupt 8 |
| Pin 63 | PE1/TXD0 β Port E bit 1 / USART0 transmit |
| Pin 64 | PEN β Programming enable (SPI programming) |
Typical Applications
ATMEGA64-16AU is suitable for 6 applications: Industrial Automation Controller, Motor Control and Drive, Legacy ATmega103 Board Upgrade, Battery-Powered Instrumentation, Multi-Interface Communication Gateway, Building Automation Node.
Industrial Automation Controller
The ATMEGA64-16AU fits industrial automation controllers because its 53 general-purpose I/O lines, four timer/counters with PWM, and dual USARTs allow a single chip to drive relays, read limit switches, and communicate on two serial buses simultaneously. Running at 16 MHz from a 5 V rail, it executes control loops at up to 16 MIPS, which is sufficient for PLC-style ladder logic and PID motor control. The 8-channel 10-bit ADC samples analog sensors such as thermocouples and pressure transducers directly, eliminating external converter chips. The -40 C to +85 C operating range and 64-pin TQFP package suit DIN-rail mounted hardware. A typical implementation places the MCU behind opto-isolated inputs and uses one USART for Modbus RTU and the other for a local HMI link, with the 2 KB EEPROM storing calibration constants across power cycles.
Recommended
Motor Control and Drive
The ATMEGA64-16AU is used in motor control because its two 16-bit timer/counters generate precise PWM waveforms for three-phase inverter bridges, while the 10-bit ADC performs simultaneous current and back-EMF sampling for field-oriented control loops. At 16 MHz the core completes a full control-loop iteration in a few microseconds, fast enough for commutation at several thousand RPM. The 53 I/O lines can drive gate-driver enable signals, read Hall sensors, and monitor fault pins without external logic. The 4 KB SRAM holds lookup tables and filter state variables, and the 64 KB Flash accommodates sensorless control algorithms. Designers typically route PWM outputs to a dedicated gate driver and use the analog comparator for overcurrent shutdown, with the JTAG interface enabling real-time debug during tuning.
Recommended
Legacy ATmega103 Board Upgrade
The ATMEGA64-16AU is the recommended upgrade for legacy ATmega103 designs because it is 100% pin compatible with the ATmega103 and can replace it on existing printed circuit boards without layout changes. The ATmega64 provides 64 KB Flash versus the ATmega103's 128 KB, but adds SRAM, EEPROM, dual USARTs, and a JTAG debug port that the older device lacks. By programming the M103C fuse, the ATmega64 enters ATmega103 compatibility mode, matching RAM, I/O pin functions, and interrupt vectors so existing firmware runs unmodified. This makes the ATMEGA64-16AU a low-risk path to extend the service life of industrial equipment whose original microcontroller has become obsolete or hard to source.
Recommended
Battery-Powered Instrumentation
The ATMEGA64-16AU suits battery-powered instrumentation because it offers six sleep modes, including power-down and power-save, that reduce current draw to microamp levels between measurements. The 2 KB EEPROM stores logged data and calibration coefficients without an external memory device, and the real-time counter keeps time while the CPU sleeps. When active, the 16 MHz core and 10-bit ADC complete a measurement burst quickly and return to sleep, maximizing battery life. The 2.7 V to 5.5 V operating range at reduced clock speed allows direct operation from a lithium primary cell or a 3.3 V regulator. A typical design uses one USART for a wireless module and the other for a service port, with the 53 I/O lines handling keypad and display interfaces.
Recommended
Multi-Interface Communication Gateway
The ATMEGA64-16AU works well as a communication gateway because its two independent USARTs can bridge two serial networks, such as RS-485 and RS-232, while the byte-oriented Two-wire serial interface connects to local sensor or EEPROM devices. The 64 KB Flash holds protocol stacks and buffering code, and the 4 KB SRAM provides enough space for dual receive/transmit ring buffers. At 16 MHz the device handles 115.2 kbps on both USARTs simultaneously with ample CPU headroom for protocol translation. The JTAG interface allows in-system debugging of the gateway firmware, and the 53 I/O lines can drive status LEDs, DIP switches, and hardware handshake signals. This makes the part a compact single-chip solution for protocol-conversion products.
Recommended
Building Automation Node
The ATMEGA64-16AU is used in building automation nodes because it combines 53 I/O lines, dual USARTs, and an 8-channel 10-bit ADC in one device, allowing a single board to read temperature, humidity, and occupancy sensors while controlling HVAC actuators and lighting relays. The 64 KB Flash accommodates communication stacks such as Modbus or a proprietary fieldbus, and the 2 KB EEPROM retains node addresses and schedules through power failures. The -40 C to +85 C rating covers typical plenum and wall-mount environments. A common implementation uses one USART for the building network and the other for a local service interface, with the RTC providing time-stamped event logging. The JTAG port simplifies field firmware updates during commissioning.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA64-16AU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA64-16AUR | ATMEGA64L-8AU | ATMEGA128-16AU | ATMEGA64A-AU |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14) | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 128 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 4 KB | 2 KB |
| Maximum CPU Speed | 16 MHz | 16 MHz | 8 MHz | 16 MHz | 16 MHz |
| Operating Voltage (at max speed) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| General Purpose I/O Pins | 53 | 53 | 53 | 53 | 53 |
| Packaging | Tray | Tape & Reel | Tray | Tray | Tray |
| ATmega103 Pin Compatibility | Yes (100%) | Yes (100%) | Yes (100%) | Yes (100%) | Yes (100%) |
Key Differentiators
- 100% pin compatibility with legacy ATmega103 (vs ATMEGA644P-15AZ)
- Dual USARTs plus 53 I/O lines in one device (vs ATMEGA32A-AU)
- Pin-compatible memory upgrade path (vs ATMEGA128-16AU)
- Wide 2.7 V to 5.5 V operating range at reduced clock (vs ATMEGA64L-8AU)
Design Notes
Decouple every VCC pin (pins 14 and 45) with a 100 nF ceramic capacitor placed within a few millimeters of the pin, and add a 10 uF bulk capacitor near the regulator output. Filter AVCC (pin 57) through a ferrite bead or a 10 ohm resistor with a 100 nF capacitor to GND to isolate ADC noise from the digital supply. Connect AREF (pin 55) to a clean reference or to AVCC through a low-pass filter; never leave AREF floating, as this degrades ADC accuracy.
Route the crystal between XTAL1 (pin 17) and XTAL2 (pin 16) with the shortest possible traces and guard them with GND. Use load capacitors sized for the crystal's specified CL, typically 22 pF for a 16 MHz crystal with 8 pF load capacitance, and place them directly at the crystal pins. Keep the RESET pin (pin 13) trace short and add a 10 kohm pull-up plus a 100 nF capacitor to GND for reliable power-on reset. Avoid routing high-current switching traces beneath the MCU.
Do not exceed 16 MHz at 5 V or 8 MHz below 4.5 V; running the device outside its speed-voltage envelope causes unpredictable execution. When migrating firmware from an ATmega103, program the M103C fuse to enable compatibility mode, and remember that the ATmega64 has 4 KB SRAM versus the ATmega103's 4 KB but different I/O register mapping. Always set the correct fuse bits for the clock source before production, since an incorrect CKSEL setting can leave the device unable to enter the bootloader.
The JTAG port (TCK, TMS, TDI, TDO on pins 50, 49, 47, 48) shares pins with ADC channels 4 through 7. If you use those ADC inputs, disable the JTAG interface by programming the JTAGEN fuse to free the pins for analog use. Keep JTAG traces short and terminate TCK with a series resistor if the debug cable is long. For the two USARTs, add series termination resistors on long RS-485 runs and use a common-mode choke to reduce EMI.
Compliance Information
The ATMEGA64-16AU is described as GREEN and RoHS compliant in distributor and datasheet data. It is an industrial-grade device (-40 C to +85 C) and is not AEC-Q100 qualified; automotive designs require a separately qualified variant. REACH, halogen-free, and conflict-minerals status were not stated in the provided data.
