ATMEGA64M1-AU - 8-bit AVR MCU, 64KB Flash, 16MHz | Microchip
MPN: ATMEGA64M1-AU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.14 | $514.00 |
| 500 | $4.62 | $2,310.00 |
| 1,000 | $4.16 | $4,160.00 |
ATMEGA64M1-AU Overview
A microcontroller (MCU) is a single-chip computer integrating a processor core, memory, and peripherals onto one die, sitting at the heart of embedded control systems within the broader power-management and automotive-electronics hierarchy. The AVR ATmega family is an 8-bit RISC architecture with 32 general-purpose working registers, executing most instructions in a single clock cycle for high code efficiency.
Key differentiating features of the ATmega64M1 include one dedicated motor power stage controller (PSC) with complementary PWM outputs, a LIN (Local Interconnect Network) 2.1-compliant UART with hardware LIN support, two flexible timer/counters with compare modes and PWM, and an 11-channel 10-bit ADC with two independent muxes for simultaneous sampling of motor phase currents.
Technical depth: the AVR core runs at up to 16 MHz from a 4.5 V to 5.5 V supply, delivering roughly 16 MIPS throughput. The on-chip PSC peripheral was purpose-built for BLDC/DC motor control with programmable dead-time and fault protection, while the hardware LIN block offloads automotive LIN bus communication from software.
Typical applications include automotive body electronics and LIN nodes, BLDC/brushed DC motor control in HVAC blowers and pumps, and industrial sensor/actuator control where 5 V noise immunity matters.
Design consideration: because the supply range tops out at 5.5 V, level-shift LIN transceivers and gate drivers must be selected for 5 V logic compatibility; ensure Brown-out detection is enabled for automotive load-dump robustness.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical motor-control design notes not found in a single manufacturer datasheet.
Drop-in alternatives for ATMEGA64M1-AU — 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-AU (same form factor and footprint) — differing in ADC, Operating Temperature, Core Architecture, EEPROM, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA64M1-15AZ
✅ Drop-In✓ In Stock
$4.68 / Unit
View Datasheet →ATMEGA64C1-AU
✅ Drop-In📋 Reference alternative (not in catalog)
ATMEGA32M1-AU
✅ Drop-In✓ In Stock
$4.98 / Unit
View Datasheet →ATMEGA16M1-AU
✅ Drop-In✓ In Stock
$4.95 / Unit
View Datasheet →ATMEGA64M1-AU Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Flash Memory | 64 KB (32K x 16) ISP Flash with read-while-write |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| Maximum Clock Frequency | 16 MHz |
| Supply Voltage Range | 4.5 V to 5.5 V |
| General Purpose I/O Lines | 27 |
| Working Registers | 32 general purpose |
| Motor Power Stage Controller | 1 (PSC with complementary PWM and dead-time) |
| Timer/Counters | 2 with compare modes and PWM |
| UART | 1 with hardware LIN 2.1 support |
| ADC | 11-channel 10-bit, 2 muxes |
| Operating Temperature | -40C to +85C |
| Package | 32-TQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Data Bus Width | 8 Bit |
| RoHS Status | Compliant |
ATMEGA64M1-AU Pin Configuration
| Pin 1 | PA0 — General purpose I/O Port A bit 0 |
| Pin 2 | PA1 — General purpose I/O Port A bit 1 |
| Pin 3 | PA2 — General purpose I/O Port A bit 2 |
| Pin 4 | PA3 — General purpose I/O Port A bit 3 |
| Pin 5 | PA4 — General purpose I/O Port A bit 4 |
| Pin 6 | PA5 — General purpose I/O Port A bit 5 |
| Pin 7 | PA6 — General purpose I/O Port A bit 6 |
| Pin 8 | PA7 — General purpose I/O Port A bit 7 |
| Pin 9 | PB0 — General purpose I/O Port B bit 0 |
| Pin 10 | VCC — Digital supply voltage (4.5 V to 5.5 V) |
| Pin 11 | GND — Ground |
| Pin 12 | PB1 — General purpose I/O Port B bit 1 |
| Pin 13 | PB2 — General purpose I/O Port B bit 2 |
| Pin 14 | PB3 — General purpose I/O Port B bit 3 |
| Pin 15 | PB4 — General purpose I/O Port B bit 4 |
| Pin 16 | PB5 — General purpose I/O Port B bit 5 |
| Pin 17 | PB6 — General purpose I/O Port B bit 6 |
| Pin 18 | PB7 — General purpose I/O Port B bit 7 |
| Pin 19 | PC7 — General purpose I/O Port C bit 7 |
| Pin 20 | PC6 — General purpose I/O Port C bit 6 |
| Pin 21 | PC5 — General purpose I/O Port C bit 5 |
| Pin 22 | PC4 — General purpose I/O Port C bit 4 |
| Pin 23 | PC3 — General purpose I/O Port C bit 3 |
| Pin 24 | PC2 — General purpose I/O Port C bit 2 |
| Pin 25 | PC1 — General purpose I/O Port C bit 1 |
| Pin 26 | PC0 — General purpose I/O Port C bit 0 |
| Pin 27 | PD7 — General purpose I/O Port D bit 7 |
| Pin 28 | PD6 — General purpose I/O Port D bit 6 |
| Pin 29 | PD5 — General purpose I/O Port D bit 5 |
| Pin 30 | PD4 — General purpose I/O Port D bit 4 |
| Pin 31 | PD3 — General purpose I/O Port D bit 3 |
| Pin 32 | RESET — Reset input (active low); shared with ISP programming |
Typical Applications
ATMEGA64M1-AU is suitable for 6 applications: Automotive LIN Bus Nodes, BLDC Motor Control, DC Fan and Blower Controllers, Industrial Sensor and Actuator Nodes, Lighting Ballast and LED Driver Control, Fuel Pump and Pump Management Modules.
Automotive LIN Bus Nodes
The ATMEGA64M1-AU fits automotive body-electronics nodes because it integrates a hardware LIN 2.1 UART, offloading protocol framing, sync, and checksum tasks from firmware and reducing CPU overhead at 16 MHz. Its 4.5 V to 5.5 V supply matches automotive 5 V regulated rails, and 27 GPIO lines provide enough I/O for switches, LEDs, and relay drivers in door modules, window lifters, and seat controllers. In a typical node, the LIN pin drives an external LIN transceiver, the 10-bit ADC samples position or current feedback, and the 2 KB EEPROM stores calibration and fault data through power cycles. The 64 KB Flash leaves room for diagnostic stacks and firmware growth that smaller 16/32 KB parts cannot absorb.
Recommended
BLDC Motor Control
The dedicated Power Stage Controller (PSC) makes the ATmega64M1 a single-chip solution for BLDC drives: it generates complementary PWM pairs with programmable dead-time, emergency shutdown input, and adjustable commutation patterns, driving a 3-phase inverter through a gate-driver IC. The 11-channel 10-bit ADC with two independent muxes can sample shunt phase currents and bus voltage within the same PWM period, enabling cycle-by-cycle current limiting. Running at 16 MHz from a 5 V rail, the AVR core executes commutation and PI speed loops with margin to spare. Compared to a generic MCU plus external PWM controller, this integration shortens BOM and improves fault response time, which is critical for HVAC blower and pump reliability in 12 V automotive and industrial systems.
Recommended
DC Fan and Blower Controllers
For brushed DC fan and blower modules, the ATmega64M1 uses one PSC channel for H-bridge PWM drive and its 10-bit ADC for back-EMF or current-based speed feedback, eliminating tachometer sensors in cost-sensitive designs. Hardware LIN allows the blower to receive speed setpoints from a vehicle climate controller over a single-wire bus, while the 2 KB EEPROM retains learned stall thresholds and runtime hours across ignition cycles. The 5 V supply and -40C to +85C grade cover the standard automotive cabin environment. Firmware fits easily in 64 KB Flash, leaving headroom for condition-monitoring features such as locked-rotor detection, duty-cycle derating, and diagnostic reporting via LIN that differentiate premium climate systems.
Recommended
Industrial Sensor and Actuator Nodes
In 5 V industrial environments, the ATmega64M1-AU serves as a sensor/actuator node combining the 11-channel 10-bit ADC for multi-sensor acquisition with PWM timer outputs for heater, valve, or actuator control. The 4 KB SRAM supports local filtering and averaging buffers, and the 2 KB EEPROM stores factory calibration coefficients in-system. Because the supply range is strictly 4.5 V to 5.5 V, the part thrives on classic industrial 5 V rails with superior noise immunity versus 3.3 V logic. The 64 KB Flash accommodates protocol stacks (Modbus-style UART framing on the non-LIN UART) and logging routines that would overflow the 16/32 KB family members, while the TQFP-32's 7x7 mm footprint suits compact DIN-rail and PCB-mounted node hardware.
Recommended
Lighting Ballast and LED Driver Control
The PSC's complementary PWM with dead-time is well suited to controlling half-bridge stages in fluorescent ballast and high-power LED driver topologies, where the ATmega64M1 regulates lamp current or LED string current via the 10-bit ADC feedback loop. Two muxes let one ADC track both output current and input/bulk voltage for feed-forward dimming correction. At 16 MHz, closed-loop bandwidths in the kilohertz range are comfortably achievable, supporting flicker-free dimming. Hardware LIN also enables DALI-over-LIN style addressing in automotive interior-lighting systems. The 64 KB Flash holds multiple dimming curves, fault dictionaries, and comms stacks simultaneously - a sizeable advantage over the 16 KB ATmega16M1 when a single firmware image must serve multiple lamp types or regional variants.
Recommended
Fuel Pump and Pump Management Modules
Automotive fuel-pump and coolant-pump controllers benefit from the ATmega64M1 combination of PSC PWM drive, ADC-based current monitoring for dry-run and jam detection, and LIN connectivity to the vehicle body controller for demand setpoints. The MCU can implement sensorless speed control using back-EMF sensing on ADC channels, and the emergency fault input on the PSC provides hardware-speed shutdown in stall or overcurrent events - faster than software-only protection. The -40C to +85C commercial grade suits in-cabin or engine-bay-adjacent mounting; under-hood designs should specify the 15AZ grade. The 2 KB EEPROM logs operating statistics (runtime, stall events) for service diagnostics, a requirement in modern telematics-enabled vehicle architectures.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA64M1-AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA64M1-15AZ | ATMEGA64C1-AU | ATMEGA32M1-AU | ATMEGA16M1-AU |
|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 64 KB | 64 KB | 64 KB | 32 KB | 16 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 2 KB | 1 KB |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Hardware LIN | Yes (LIN 2.1 UART) | Yes (LIN 2.1) | No | Yes (LIN 2.1) | Yes (LIN 2.1) |
| Motor Power Stage Controller (PSC) | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +85C |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
Key Differentiators
- Full 64 KB Flash in a pin-compatible family lineup (vs ATMEGA32M1-AU)
- Integrated hardware LIN 2.1 UART (vs ATMEGA64C1-AU)
- Single-chip motor control with PSC (vs ATMEGA16M1-AU)
- Automotive temperature upgrade path (vs ATMEGA64M1-15AZ)
Design Notes
Decouple VCC (pin 10) with a 100 nF ceramic capacitor placed within 3 mm of the pin plus a 10 uF bulk capacitor near the part. The PSC motor outputs toggle large gate-driver loads, so route heavy motor/gate-drive traces away from the ADC sense lines and return them on a dedicated ground path to keep ADC noise low. The 10-bit ADC needs a quiet analog reference - consider an RC filter or external reference on AREF. Estimated: a 3-phase bridge switching 2 A at 16 kHz with 20 ns dead-time edges injects significant ground bounce if motor power ground is shared with the digital ground under the TQFP.
The supply range is strictly 4.5 V to 5.5 V - do not attempt 3.3 V operation; the 16 MHz speed grade assumes 5 V per AVR frequency-vs-voltage limits. Enable Brown-out Detection (BOD) fuse at approximately 2.7 V or higher for load-dump robustness in automotive rails. When using hardware LIN, enable the LIN transceiver's wake/sleep states consistently with the MCU's power-down mode to avoid bus lockup. Verify fuse settings for ISP programming speed: with an 16 MHz system clock, SPI ISP clock must be below f_CPU/4.
The 32-TQFP (7x7 mm) exposes no thermal pad; heat exits through the leads, so provide at least nominal copper pour on all four sides of the footprint. Keep the crystal (if used) within 10 mm of the XTAL pins with guard ground, or use the internal RC oscillator for non-timing-critical motor applications. Pin-1 dot orientation: TQFP numbering runs counter-clockwise from the top-left dot - mismatches here are the most common rework cause on this family. Route LIN transceiver connections with a series resistor per LIN spec, and keep the PSC fault-input trace short and pulled to a defined level to prevent spurious shutdowns.
Compliance Information
AU suffix denotes RoHS-compliant, lead-free package per Microchip/Atmel ordering-code convention. AEC-Q100 qualification status for this specific ordering code not stated in provided data - the 15AZ grade is commonly referenced for automotive temperature ranges.
