ATXMEGA64D3-MH - 64KB Flash 32MHz AVR XMEGA D3 MCU | Microchip
MPN: ATXMEGA64D3-MH ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.86 | $5.86 |
| 10 | $5.27 | $52.70 |
| 100 | $4.68 | $468.00 |
| 500 | $4.1 | $2,050.00 |
| 1,000 | $3.51 | $3,510.00 |
ATXMEGA64D3-MH Overview
An 8/16-bit AVR XMEGA microcontroller is a member of the reduced instruction-set computing (RISC) family of microcontrollers that executes most instructions in a single clock cycle. The "XMEGA D3" sub-family extends the classic AVR architecture with higher peripheral integration (DMA, DAC, event system, crypto engine in some variants) and a 32 MHz pipeline, positioning it between traditional 8-bit MCUs and 32-bit Cortex-M parts on the cost/performance curve. The XMEGA D3 specifically targets low-power applications that still need high-resolution analog peripherals and fast ADC sampling.
Key features of the ATXMEGA64D3-MH include 64 KB Flash with read-while-write support, 2 KB EEPROM for non-volatile data, 4 KB SRAM, 34 programmable I/O lines, two 12-bit DAC channels, a 12-bit ADC, four USART, two two-wire interfaces (TWI), and a four-channel event system. The QFN-64 (9x9) package with exposed thermal pad provides low thermal resistance, suitable for the device's wide -40C to +85C industrial operating range and 32 MHz operation at full peripheral load.
Typical applications include industrial sensor hubs, low-power data loggers, human-machine interface (HMI) controllers, USB device controllers, smart energy metering, and motor control peripherals. Designers frequently select the XMEGA D3 family when an 8-bit footprint is acceptable but more analog integration than an ATmega is required.
When using this device, allocate proper decoupling (100 nF + 1 uF) on each AVDD/DVDD pair, keep the analog and digital ground planes separated until they meet at the exposed pad, and use Atmel/Microchip Studio 7 with the AVR/GNU toolchain to leverage the integrated PDI (program and debug interface). The MH suffix indicates QFN-64 (9x9 mm) industrial temperature grade.
This page synthesizes distributor pricing, drop-in alternatives from the ATXMEGA family, and practical design notes not found in the standalone datasheet.
Drop-in alternatives for ATXMEGA64D3-MH — 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 ATXMEGA64D3-MH (same form factor and footprint) — differing in Package, I/O Pins, ADC, Core, DAC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATXMEGA32D3-MH
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$4.18 / Unit
View Datasheet →ATXMEGA16D4-MH
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.62 / Unit
View Datasheet →ATXMEGA64D4-MH
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ATXMEGA64A4U-MH
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.65 / Unit
View Datasheet →ATXMEGA128D4-MH
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.72 / Unit
View Datasheet →ATXMEGA64D3-MH Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR XMEGA (8/16-bit RISC) |
| Family | ATxmega D3 |
| CPU Clock Speed (max) | 32 MHz |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Boot Code Section | 4 KB |
| Data EEPROM | 2 KB |
| SRAM | 4 KB |
| Supply Voltage (VDD) | 1.6 V to 3.6 V |
| I/O Pins | 34 |
| Package | 64-pin QFN (9x9 mm) with EP |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| ADC | 12-bit, up to 2 Msps |
| DAC | 2 x 12-bit |
| USART | 4 |
| TWI (I2C-compatible) | 2 |
| SPI | 2 (USART in SPI mode + dedicated) |
| Event System Channels | 4 |
| Program/Debug Interface | PDI |
| RoHS Status | Compliant |
ATXMEGA64D3-MH 64-pin qfn (9x9 mm) with ep Pin Configuration Guide
Pin configuration for ATXMEGA64D3-MH (64-pin qfn (9x9 mm) with ep 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 ATXMEGA64D3-MH.
Refer to the datasheet for full pin configuration.
Typical Applications
ATXMEGA64D3-MH is suitable for 6 applications: Industrial Sensor Hub, Low-Power Data Logger, HMI Controller (Display + Keypad), USB Device / HID Controller, Smart Energy Meter, Motor Control Peripheral Controller.
Industrial Sensor Hub
The ATXMEGA64D3-MH is a strong fit for industrial sensor hubs where multiple analog and digital channels must be sampled and processed concurrently. The device's 12-bit ADC sampling up to 2 Msps, 2 x 12-bit DAC outputs for excitation signals, and 4-channel event system let designers trigger ADC conversions from timer or GPIO events without CPU intervention. With 34 programmable I/O lines the part can host multiple SPI sensors, I2C peripherals, and a UART link to a host PLC. The 64 KB Flash accommodates full Modbus or CANopen protocol stacks alongside sensor firmware, while the 2 KB EEPROM stores calibration constants and 4 KB SRAM buffers bursts of sensor data.
Recommended
Low-Power Data Logger
The ATXMEGA64D3-MH fits battery-backed data loggers thanks to its 1.6 V minimum supply, deep-sleep current in the microamp range, and 64 KB of Flash that can hold weeks of scheduling and event logging code. The 2 KB EEPROM is sufficient to buffer acquisition records during write cycles while preserving Flash endurance, and the RTC counter with selectable 32 kHz crystal source keeps wall-clock time during sleep. Battery life at 1 sample per minute can exceed 1 year on a single CR2032 coin cell, especially when leveraging the XMEGA sleep modes and DMA-driven ADC bursts.
Recommended
HMI Controller (Display + Keypad)
The ATXMEGA64D3-MH works well in human-machine interface panels that combine an LCD/TFT display with a keypad or touch input. The 2 x 12-bit DAC outputs can drive contrast voltage for character LCDs or supply bias on white amplifiers, while the four USART ports simultaneously handle a TFT controller, a Wi-Fi/BLE module, and an RS-485 fieldbus. The 34 I/O lines drive up to a 4x5 matrix keypad plus status LEDs without external I/O expanders. The 32 MHz CPU clock renders medium-resolution graphics smoothly in software on small color TFTs without an external graphics controller.
Recommended
USB Device / HID Controller
The ATXMEGA64D3-MH can serve as a USB device controller through the integrated USB Full-Speed peripheral available on D3 family parts, supporting keyboards, mice, game controllers, and CDC-class virtual COM devices. The 64 KB Flash holds USB stacks and HID descriptor tables comfortably, while the four USART ports provide passthrough channels for bridging USB to RS-232 or RS-485 industrial devices. The 2 KB EEPROM stores USB descriptors and user-configurable strings. For USB host or OTG roles, choose the ATXMEGA64A4U-MH or ATXMEGA64A3-AU instead.
Recommended
Smart Energy Meter
The ATXMEGA64D3-MH meets the precision and integration needs of single-phase smart energy meters, where its 12-bit ADC with PGA samples current and voltage CTs while the 12-bit DAC calibrates the analog front end. The four event channels can synchronize ADC sampling to zero-crossing events, improving power-factor calculation accuracy. The 64 KB Flash supports DLMS/COSEM or IEC 62056 protocol stacks and the 2 KB EEPROM stores tariff tables and authentication keys. The 1.6-3.6 V range supports direct battery backup during line-power outages.
Recommended
Motor Control Peripheral Controller
The ATXMEGA64D3-MH can act as a peripheral controller next to a dedicated motor-control DSP or FPGA, handling user-interface buttons, parameter storage, and CAN/LIN communication. Its event system synchronizes I/O toggling to the motor PWM cycle, supporting quadrature encoder sampling and Hall-sensor decoding for BLDC commutation feedback. The four USART channels split between a CAN-FD controller via SPI, a LIN transceiver, and a debug UART. 64 KB of Flash accommodates IEC 60730 class B self-test routines for white goods.
Recommended
Recommended Products Summary
Engineering reference data for ATXMEGA64D3-MH — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATXMEGA32D3-MH | ATXMEGA16D4-MH | ATXMEGA64D4-MH | ATXMEGA64A4U-MH | ATXMEGA128D4-MH |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | QFN-64 (9x9 mm) | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same |
| Flash Memory | 64 KB | 32 KB | 16 KB | 64 KB | 64 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 8 KB | 4 KB | 8 KB |
| EEPROM | 2 KB | 1 KB | 1 KB | 2 KB | 2 KB | 2 KB |
| Maximum Clock | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| USB Peripheral | Yes (device) | Yes (device) | Yes (device) | Yes (device) | Yes (host + device) | Yes (device) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Key Differentiators
- Lowest minimum supply voltage in the ATXMEGA QFN-64 family (vs ATXMEGA64A3-AU)
- Highest ADC sample rate among same-package XMEGA D3 parts (vs ATXMEGA64A3-AU)
- Native USB device peripheral without external PHY (vs ATMEGA328P-AUR)
Design Notes
Provide 100 nF plus 1uF ceramic decoupling on every AVDD/DVDD pin pair, placed within 5 mm of the package pads. The XMEGA D3 family is sensitive to AVCC ripple - injecting switching noise from a DC-DC converter into AVDD will degrade the 12-bit ADC's effective ENOB. Use a ferrite bead between the digital 3V3 rail and the AVDD pin, and route the analog ground star-pattern back to the exposed thermal pad.
The QFN-64 (9x9 mm) exposed thermal pad must be soldered to a continuous ground copper pour on the top layer. Without a proper thermal pad, junction-to-ambient thermal resistance rises by ~30-50% and the device may throttle or fail in enclosed industrial housings. Stencil aperture for the EP should be split into 4-9 smaller apertures to reduce solder voiding to under 5%.
The PDI (Program and Debug Interface) signals PDI_DATA and PDI_CLK must be brought out to a 2x3 or 1x6 header with no series resistors - the AVR/XMEGA PDI protocol to drive the lines actively. Adding series resistors to PDI pins will prevent programming. Keep the trace length under 50 mm and avoid stubs; route them away from switching power and PWM signals to prevent in-circuit debug noise.
Do not assume JTAG is available on the ATXMEGA D3 - only PDI is present. If your toolchain expects JTAG, switch to Atmel Studio 7 or MPLAB X with an Atmel-ICE debugger. Lock-bit programming without PDI recovery can brick the device; always leave the boot section enabled and test PDI access before setting lock bits in production firmware.
Compliance Information
RoHS and REACH compliant per DigiKey product listing. Not AEC-Q100 qualified - this is a commercial/industrial MCU. Halogen-free per Microchip green-compliance policy.
