ATMEGA64-16MI - 8-Bit AVR MCU, 64KB Flash, 16MHz | Microchip
MPN: ATMEGA64-16MI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.9 | $6.90 |
| 10 | $6.21 | $62.10 |
| 100 | $5.52 | $552.00 |
| 500 | $4.97 | $2,485.00 |
| 1,000 | $4.48 | $4,480.00 |
ATMEGA64-16MI Overview
An 8-bit microcontroller is a self-contained computing IC that integrates a CPU core, program memory, data memory, and peripherals such as timers, serial interfaces, and converters on a single die. The ATmega64 belongs to the AVR enhanced RISC family within the broader hierarchy of embedded processors and power/processing management devices in a system-on-board design.
Key features include up to 16 MIPS throughput at 16MHz (one MIPS per MHz), 130 powerful instructions with mostly single-clock-cycle execution, eight general-purpose working registers, and a JTAG interface supporting on-chip debugging. The 64KB self-programming Flash allows firmware updates in the field, while the 2KB EEPROM retains calibration and configuration data through power cycles.
The AVR architecture achieves near one MIPS per MHz by fetching and executing most instructions in a single clock cycle, which lets designers trade clock frequency directly against power consumption. Hardware multipliers, nested interrupt vectors, and rich peripheral sets (two USARTs, SPI, TWI/I2C, timers with PWM) reduce external component count.
Typical applications include industrial automation controllers, sensor acquisition nodes using the 8-channel 10-bit ADC, motor control panels, building management systems, and embedded instrumentation where 5V logic levels and industrial temperature ratings are required.
A key design consideration is that the -16MI suffix denotes the industrial-grade, 4.5V to 5.5V 16MHz speed grade in the QFN package; always confirm clock frequency and temperature requirements before substituting speed or temperature variants.
This page synthesizes verified distributor data, drop-in alternatives, practical design notes, and FAQ content not found in the manufacturer datasheet, as of 2026-09-18.
Drop-in alternatives for ATMEGA64-16MI — 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 ATMEGA64-16MI (same form factor and footprint) — differing in Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA64-16MU
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →ATMEGA64A-MU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA64-16AU
✅ Drop-In✓ In Stock
$7.23 / Unit
View Datasheet →ATMEGA64-16MI Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16 MHz |
| Flash Memory Size | 64 KB (32K x 16) |
| SRAM | 4 KB |
| EEPROM | 2 KB |
| ADC Resolution | 10-bit |
| ADC Channels | 8 channels |
| Instructions | 130 powerful instructions, most single-cycle |
| Throughput | Up to 16 MIPS at 16 MHz |
| Debug Interface | JTAG (on-chip debug) |
| Supply Voltage | 5 V (industrial speed grade) |
| Operating Temperature | -40C to +85C (industrial) |
| Package | 64-QFN (9x9 mm) |
| Mounting Type | Surface Mount |
| Self-Programming Flash | Yes (In-System Programmable) |
ATMEGA64-16MI 64-qfn (9x9 mm) Pin Configuration Guide
Pin configuration for ATMEGA64-16MI (64-qfn (9x9 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA64-16MI.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA64-16MI is suitable for 6 applications: Industrial Automation Controllers, Sensor Acquisition Nodes, Motor Control Panels, Building Management Systems, Embedded Instrumentation, Communication Protocol Converters.
Industrial Automation Controllers
The ATMEGA64-16MI fits industrial automation controllers because its 64KB Flash accommodates substantial protocol stacks and state machines, while the industrial -40C to +85C temperature grade and 5V noise immunity match factory-floor electrical environments. The JTAG on-chip-debug interface shortens commissioning cycles by allowing live breakpoint debugging inside control cabinets. Two USARTs let one chip bridge Modbus RTU on RS-485 with a local HMI UART simultaneously. Designers typically run the 16MHz clock from a crystal with the internal brown-out detector enabled, and use the 4KB SRAM for buffering sensor frames; the self-programming Flash enables field firmware updates without replacing hardware.
Recommended
Sensor Acquisition Nodes
The ATMEGA64-16MI is well suited to multi-channel sensor acquisition because its 8-channel 10-bit ADC samples up to eight analog inputs at approximately 15 kSPS in free-running mode, enough for vibration, temperature, and pressure monitoring. The 2KB EEPROM stores per-unit calibration coefficients that survive power cycling, and the 4KB SRAM buffers acquisition windows before transmission. Running at 16MHz gives 16 MIPS of headroom for oversampling and averaging filters that push effective resolution beyond 10 bits. The QFN 9x9 mm package keeps node PCBs compact for distributed installations, and the 5V rail tolerates long cable-induced supply droop better than 3.3V alternatives.
Recommended
Motor Control Panels
In motor control panels, the ATMEGA64-16MI generates multi-channel PWM from its hardware timers (OC0, OC1A/B/C, OC2, and 16-bit Timer3 PWM outputs) to drive H-bridges and inverter stages, while the ADC reads shunt-based current feedback. Its 16MHz core executes control-loop arithmetic with cycle-time margin, and input-capture pins timestamp encoder pulses in hardware, unloading the CPU. The industrial temperature rating suits enclosed drive cabinets where ambient temperatures reach 70C or more. Designers should route PWM outputs away from ADC lines and use the internal noise canceller on input capture; the JTAG port allows tuning of PI loop constants in-system during bring-up.
Recommended
Building Management Systems
The ATMEGA64-16MI serves building management nodes where two USARTs (one for a BACnet/Modbus gateway, one for a local display), TWI/I2C for environmental sensors, and 53-directional I/O lines for relay and damper control consolidate an entire controller into one 5V device. Its 64KB Flash holds both the communication stack and scheduling logic, while the EEPROM retains setpoints and schedules through outages. The industrial temperature grade covers rooftop and plant-room installations. Because 5V I/O directly drives opto-isolated relay inputs, external level shifting is eliminated, reducing BOM cost in high-volume controller boards using the 9x9 mm QFN footprint.
Recommended
Embedded Instrumentation
Bench and portable instruments benefit from the ATMEGA64-16MI's combination of JTAG on-chip debugging, a 10-bit ADC, and generous 64KB program memory for menu systems, calibration tables, and data-logging routines. The 16 MIPS throughput at 16MHz supports real-time display refresh and floating-point-equivalent fixed-point math. The QFN package's exposed ground paddle lowers ground impedance, improving analog accuracy when AREF is properly decoupled and AGND is isolated per the datasheet's layout guidance. The self-programming Flash enables in-field firmware feature upgrades, important for instruments with long service lives deployed across industrial sites.
Recommended
Communication Protocol Converters
The ATMEGA64-16MI excels as a protocol converter because its two independent USARTs plus SPI and TWI interfaces allow simultaneous operation on up to four serial channels - for example, translating Modbus RTU on one UART to a proprietary ASCII stream on the other while I2C handles configuration EEPROM. The 4KB SRAM provides deep ring buffers that absorb burst traffic without overflow at 16MHz operation, and the single-cycle AVR core processes byte-level framing in software with ample margin. Hardware flow control and the industrial temperature rating make the part reliable in unattended network equipment enclosures over long service intervals.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA64-16MI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA64-16MU | ATMEGA64A-MU | ATMEGA64-16AU |
|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (MLF-64) - same | 64-QFN (MLF-64) - same | TQFP-64 (gull-wing) |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Flash Memory | 64 KB | 64 KB | 64 KB | 64 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 2 KB |
| Maximum Clock Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Supply Voltage | 5 V grade (approx. 4.5-5.5 V) | 5 V grade | 5 V grade | 5 V grade |
| Debug Interface | JTAG on-chip debug | JTAG on-chip debug | JTAG on-chip debug | JTAG on-chip debug |
| ADC | 8-ch, 10-bit | 8-ch, 10-bit | 8-ch, 10-bit | 8-ch, 10-bit |
Key Differentiators
- Identical footprint replacement with consolidated errata (vs ATMEGA64A-MU)
- QFN thermal/EMI advantage over TQFP sibling (vs ATMEGA64-16AU)
- JTAG on-chip debug in a 64-pin mid-range AVR (vs ATMEGA64-16MU)
Design Notes
The 64-QFN (9x9 mm) package has an exposed paddle under the die that must be soldered to a grounded thermal pad array on the PCB. This paddle is the primary ground connection for the device; skipping it causes unreliable ground returns, analog noise on the ADC, and reflow soldering defects. Use an array of thermal vias (typically 4x4 or larger) connecting the paddle to the internal ground plane, per standard QFN land-pattern guidance for MLF-64 packages.
Decouple each VCC pin (the ATmega64 has multiple VCC/GND pairs plus AVCC) with a 100 nF ceramic capacitor placed within 3 mm of the pin, and add bulk capacitance of 4.7 uF to 10 uF near the device. AVCC must be connected to VCC through a low-pass filter (for example, an LC network) when ADC accuracy matters. The ATmega64 datasheet recommends a decoupling network per supply pin; omitting AVCC decoupling is a common cause of ADC noise complaints.
Confirm the voltage/speed curve before substituting variants: the 16MHz speed grade requires approximately 4.5V to 5.5V operation, so the -16MI cannot be dropped into a 3.3V design. Also verify fuse settings on first programming - default factory fuses select the internal 1MHz RC oscillator, so a design expecting an external 16MHz crystal will run slow until the CKOPT/CKSEL fuses are programmed. Finally, when reusing ATmega64 code on the ATMEGA64A-MU, review the A-revision errata summary for any affected peripherals in your design.
Compliance Information
Compliance attributes were not stated in the retrieved web data. Distributor product pages (DigiKey/Mouser) typically list RoHS and REACH status for this part; verify against the official Microchip ATmega64 product page before procurement.
