ATMEGA64M1-MU - 8-bit AVR MCU 64KB Flash 16MHz LIN | Microchip
MPN: ATMEGA64M1-MU β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.64 | $8.64 |
| 10 | $8.2 | $82.00 |
| 100 | $7.23 | $723.00 |
| 500 | $6.9 | $3,450.00 |
| 1,000 | $6.55 | $6,550.00 |
ATMEGA64M1-MU Overview
A microcontroller unit (MCU) is a single-chip computer that combines a processor core, nonvolatile program memory, data RAM, and peripherals on one die, sitting inside the broader hierarchy of embedded processors: AVR 8-bit core -> ATmega family -> microcontroller -> semiconductor device. The AVR architecture uses a Harvard memory map and mostly single-cycle instruction execution, so effective throughput approaches 16 MIPS at 16 MHz.
Key features of the ATMEGA64M1 include read-while-write self-programming Flash for in-system updates, 27 general-purpose I/O lines, and 32 general-purpose working registers that give the compiler fast register access. The M1 sub-family adds automotive-grade peripherals such as the LIN controller, a Power Stage Controller (PSC) for motor drive PWM generation, and an analog section suited to sensor-based closed-loop control.
Architecturally, the device belongs to the ATmega16M1/32M1/64M1/64C1 automotive family sharing the same die-level peripherals and software compatibility, which simplifies migration between memory-density points. The external data memory interface of the generic ATmega64 line is replaced by LIN and PSC blocks, trading universal bus expansion for in-vehicle networking and drive capability.
Typical applications include LIN-based body control modules, DC and BLDC motor control with PSC-driven half-bridges, HVAC blower and pump control, and sensor or actuator nodes on the 12V automotive bus. The 16 MHz rating and rich analog block also fit pump and fan controllers in industrial equipment.
Design consideration: at the 16 MHz maximum frequency the device is typically clocked from the internal oscillator or an external crystal; ensure the VQFN exposed pad is soldered to a solid ground plane for thermal and EMC performance in automotive environments.
This page synthesizes distributor pricing, family drop-in alternatives, and application guidance not found in a single manufacturer datasheet.
Drop-in alternatives for ATMEGA64M1-MU 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 ATMEGA64M1-MU (same form factor and footprint) β differing in Core, EEPROM, Package, SRAM.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA32M1-MU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA64C1-MU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA16M1-MU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$3.85 / Unit
View Datasheet βATMEGA64M1-MU Maximum Ratings & Electrical Characteristics
| Core | 8-bit AVR RISC |
| Program Memory Size | 64 KB (32K x 16) Flash |
| Flash Programming | ISP, read-while-write |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| Maximum Clock Frequency | 16 MHz |
| General Purpose I/O | 27 lines |
| Working Registers | 32 x 8-bit general purpose |
| Package | 32-VQFN (5x5 mm), exposed pad |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
| Key Peripherals | LIN controller, PSC (Power Stage Controller), ADC, SPI, UART |
| RoHS Status | Compliant |
| Series | AVR ATmega - Automotive M1 family |
ATMEGA64M1-MU 32-vqfn (5x5 mm), exposed pad Pin Configuration Guide
Pin configuration for ATMEGA64M1-MU (32-vqfn (5x5 mm), exposed pad 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 ATMEGA64M1-MU.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA64M1-MU is suitable for 6 applications: LIN Body Control Module, DC and BLDC Motor Control, HVAC Blower and Pump Control, Automotive LIN Sensor Node, Industrial Pump and Fan Controllers, Gateway and Diagnostics Modules.
LIN Body Control Module
The ATMEGA64M1-MU fits automotive body control nodes because it integrates a LIN 2.1 compliant controller directly on-chip, removing the need for a separate LIN system-on-chip or software bit-banged UART implementation. With 64 KB Flash and 27 GPIO lines, it handles protocol stacks plus application logic for window lifters, seat modules, mirror controls, and lighting nodes on the 12V vehicle bus. The LIN UART supports both master and slave roles with correct baud-rate generation from the 16 MHz clock. Placed behind a LIN transceiver such as the ATA6624 or MCP2003, the MCU needs only simple bus protection. The 2 KB EEPROM retains calibration and customer-programmable parameters across power cycles, and the -40C to +85C operating range covers under-hood-adjacent cabin modules.
Recommended
DC and BLDC Motor Control
The ATMEGA64M1-MU is purpose-built for motor drive: the Power Stage Controller (PSC) generates complementary PWM outputs with dead-time insertion for half-bridge and three-phase inverters, while the analog block supports current sensing for closed-loop commutation. The 16 MHz AVR core executes trapezoidal or sensorless algorithms within the 4 KB SRAM and 64 KB Flash budget, leaving room for LIN diagnostics and failure logging. In a typical blower or pump application, the PSC outputs drive a gate-driver stage (for example IRS2183 or an integrated three-phase driver), and the on-chip ADC samples the shunt current each PWM cycle. Because PWM, dead-time, and fault shutdown are handled in hardware, the core is free for supervisory tasks, improving both control determinism and functional robustness against transient faults.
Recommended
HVAC Blower and Pump Control
HVAC blowers, coolant pumps, and fans benefit from the ATMEGA64M1-MU's combination of LIN connectivity and hardware motor PWM. In vehicle climate systems, the LIN master (climate controller) sends speed setpoints; the ATMEGA64M1-MU node decodes them and translates to PSC duty cycles with soft-start ramps, reducing acoustic noise and inrush. The 10-bit analog section reads NTC thermistors and supply voltage for derating and stall detection, while the EEPROM stores end-of-line calibration data. The 5x5 mm VQFN package fits compact actuator housings, and the exposed pad provides thermal relief for the driver-adjacent mounting. Operation from -40C to +85C covers plenum-mounted electronics, and the internal oscillator option removes crystal cost where clock accuracy permits.
Recommended
Automotive LIN Sensor Node
As a LIN slave sensor node, the ATMEGA64M1-MU pairs its LIN controller with the on-chip analog front end to digitize pressure, position, or temperature readings and report them on a schedule with checksummed LIN frames. The 64 KB Flash accommodates a full LIN 2.1 stack, sensor linearization tables, and diagnostic reporting, while the 27 GPIOs drive local indicators or redundant outputs. Wake-up handling on the LIN bus is supported in hardware, allowing the node to spend most of its life in low-power sleep and wake on bus activity - essential for battery-connected modules. The EEPROM keeps node address and configuration so production variants share one firmware image. Overall BOM is minimized because transceiver, MCU, analog, and memory functions fit in two ICs plus passives.
Recommended
Industrial Pump and Fan Controllers
Beyond automotive, the ATMEGA64M1-MU serves industrial pump, fan, and compressor controllers where deterministic hardware PWM and fieldbus connectivity are both required. The PSC drives IGBT or MOSFET half-bridges with programmable dead time, and fault inputs can shut PWM off in hardware within nanoseconds of an overcurrent event - faster than any software loop. The 16 MHz core runs PID speed control, and 64 KB Flash holds multi-protocol support such as LIN alongside simple UART diagnostics. Surge-robust designs use the MCU's brown-out detector and watchdog for safe recovery after supply dips common on industrial 24V systems fed through DC-DC converters like the LM2596 family. The compact VQFN also fits DIN-rail adapter boards and sealed actuator housings.
Recommended
Gateway and Diagnostics Modules
Sub-network gateways use the ATMEGA64M1-MU to bridge LIN to other buses or to act as LIN master for a cluster of slave nodes. The 64 KB Flash is large enough to hold the LIN schedule tables, a secondary UART link to a supervisory controller, and an OTA-style reprogramming path exploiting the read-while-write self-programming Flash: the node can update its own application firmware from data received over LIN. Hardware EEPROM stores vehicle-specific configuration, while the 27 GPIO lines manage local I/O aggregation such as relay coils monitored through the ADC. Diagnostics benefit from the family's built-in debug support and Microchip's development ecosystem, including starter kits and AVR Studio tooling for the M1 series.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA64M1-MU β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA32M1-MU | ATMEGA64C1-MU | ATMEGA16M1-MU |
|---|---|---|---|---|
| Package | 32-VQFN (5x5 mm), exposed pad | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same | 32-VQFN (5x5 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 32 KB | 64 KB | 16 KB |
| SRAM | 4 KB | 2 KB | 4 KB | 1 KB |
| EEPROM | 2 KB | 1 KB | 2 KB | 512 B |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| LIN Controller | Yes (LIN 2.1) | Yes (LIN 2.1) | Yes (LIN 2.1) | Yes (LIN 2.1) |
| PSC Motor Peripheral | Yes | Yes | No (C1 variant) | Yes |
Key Differentiators
- Integrated LIN 2.1 controller plus PSC motor PWM on one die (vs ATMEGA64A-MUR)
- Motor-drive peripheral set vs cost-reduced C1 variant (vs ATMEGA64C1-MU)
- Density upgrade within identical footprint (vs ATMEGA32M1-MU)
Design Notes
The 32-VQFN exposed pad must be soldered to a ground plane through a via array (typically 9-16 vias under the pad). This is the primary ground return and thermal path for the die; skipping the pad connection raises junction temperature and degrades EMC performance in automotive environments. Follow the land pattern in the Microchip ATmega16M1/32M1/64M1/64C1 family datasheet mechanical drawing, and verify reflow profile for the 0.5 mm pitch QFN with your assembler.
Automotive 12V rails exhibit load-dump transients and cranking dips. Feed the ATMEGA64M1-MU from a qualified local regulator (for example an ATA6624 system-basis chip that also integrates the LIN transceiver) and add bulk capacitance plus TVS protection per your load-dump spec. Use the internal brown-out detector and watchdog so the LIN node recovers cleanly after supply sag. Decouple VCC and AVCC with 100 nF ceramics placed within 2 mm of the pins, plus a bulk 4.7-10 uF near the regulator.
The PSC outputs switch several amps in motor-drive layouts, so keep gate-drive loops small, route PSC outputs away from the LIN bus traces, and return motor current on a dedicated ground island tied to the MCU exposed pad at one point. Use the PSC dead-time registers rather than software delay for switching transitions, and enable the hardware fault shutdown input so overcurrent events stop PWM without CPU intervention. Spread-spectrum or reduced slew options on the outputs further cut conducted emissions on the LIN line.
Compliance Information
Distributor listings present the ATMEGA64M1-MU as RoHS-compliant stock. REACH, AEC-Q100 qualification level, and halogen-free status should be confirmed from Microchip's official material declaration for this exact MPN.
