ATXMEGA32C3-MHR - 32KB Flash 8/16-bit AVR XMEGA MCU 64-QFN
MPN: ATXMEGA32C3-MHR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.2 | $6.20 |
| 10 | $5.78 | $57.80 |
| 100 | $5.1 | $510.00 |
| 500 | $4.45 | $2,225.00 |
| 1,000 | $3.9 | $3,900.00 |
ATXMEGA32C3-MHR Overview
What is an AVR XMEGA microcontroller? The XMEGA family extends Atmel's AVR enhanced RISC architecture into the 8/16-bit microcontroller segment. It belongs to the wider hierarchy: microcontroller (MCU) -> 8/16-bit MCU -> AVR core MCU -> XMEGA family. XMEGA devices are positioned between classic 8-bit AVR microcontrollers and 32-bit ARM Cortex-M parts, offering richer peripherals (DMA, event system, crypto engine on some variants) than classic AVR while retaining a single-cycle RISC core that is simple to program in C.
Key features include a four-channel event system for inter-peripheral signaling without CPU intervention, a programmable multi-level interrupt controller, 50 general-purpose I/O pins, a full-speed USB device interface, multiple USART/SPI/TWI peripherals, a 12-bit ADC and DAC, and AES/DES crypto acceleration on selected variants. The 32 KB Flash supports application programming through boot-loader, JTAG, or PDI interfaces. Industrial-grade temperature range (-40C to +85C) and 1.6-3.6 V operation make it suitable for battery-powered and harsh-environment designs. A 12 mA maximum active supply current is specified in the brief, while sleep-mode currents are in the microamp range.
Architecturally, the ATXMEGA32C3 uses the AVR enhanced RISC core with a multi-stage pipeline and Harvard bus architecture that allows instruction fetch and memory access to overlap. The four-channel event system routes peripheral triggers (timer, ADC, DMA) directly between peripherals, offloading the CPU. The 64-pin QFN package exposes the full peripheral set and supports up to 50 GPIO lines.
Typical applications include industrial control panels, USB human-interface devices (HID), smart sensors with on-board crypto, low-power IoT edge nodes, building automation, and consumer electronics with touch or display interfaces. The AES/DES hardware accelerator enables secure firmware and authenticated sensor links. The part is widely used in designs that migrate from older ATmega MCUs but need more peripherals and lower active power.
A key design consideration is decoupling: place 100 nF and 1 uF ceramic capacitors close to each VCC pin and provide adequate ground stitching under the QFN thermal pad to minimize EMI. Program/debug is performed through the PDI (Program and Debug Interface) two-wire protocol rather than JTAG on this device family.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATXMEGA32C3-MHR — 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 ATXMEGA32C3-MHR (same form factor and footprint) — differing in Package, ADC, DAC, SRAM, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATXMEGA32C3-MH
✅ Drop-In✓ In Stock
$2.41 / Unit
View Datasheet →ATXMEGA32C3-AUR
✅ Drop-In📋 Reference alternative (not in catalog)
ATXMEGA256C3-MH
✅ Drop-In✓ In Stock
$4.68 / Unit
View Datasheet →ATXMEGA32C3-AU
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ATXMEGA128D4-MH
✅ Drop-In✓ In Stock
$3.72 / Unit
View Datasheet →ATXMEGA32C3-MHR Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR XMEGA (enhanced RISC), 8/16-bit |
| CPU Core | AVR |
| Max CPU Clock | 32 MHz |
| Flash Memory | 32 KB (16K x 16), with 8 KB boot section |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| Supply Voltage | 1.6 V to 3.6 V |
| Max Active Supply Current | 12 mA |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 64-QFN (9x9 mm) |
| GPIO Pins | 50 (general purpose) |
| Event System Channels | 4 |
| USB Interface | Full-speed USB Device |
| ADC | 12-bit |
| DAC | 12-bit |
| Crypto Accelerator | AES / DES hardware |
| Program/Debug Interface | PDI (2-wire) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (Green) |
ATXMEGA32C3-MHR 64-qfn (9x9 mm) Pin Configuration Guide
Pin configuration for ATXMEGA32C3-MHR (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 ATXMEGA32C3-MHR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATXMEGA32C3-MHR is suitable for 7 applications: USB Human Interface Device (HID), Industrial Control Panel, Secure IoT Sensor Node, Building Automation Controller, Battery-Powered Data Logger, Consumer Audio Interface, Smart Sensor Hub.
USB Human Interface Device (HID)
The ATXMEGA32C3-MHR is well-suited for USB HID peripherals such as keyboards, mice, game controllers, and custom input devices because of its integrated full-speed USB 2.0 device controller with on-chip transceiver. The 32 KB Flash comfortably hosts HID class drivers plus application logic, while 4 KB SRAM buffers HID report packets. The four-channel event system wakes the CPU on USB resume without polling, reducing active current. At USB bus power (5 V regulated down to 3.3 V by an LDO such as AP2112K), the MCU plus USB PHY draws only a few milliamps. Compared with discrete USB MCUs, this part eliminates an external PHY, saving PCB area and BOM cost.
Recommended
Industrial Control Panel
The ATXMEGA32C3-MHR fits industrial control panels that need multi-channel ADC scanning, deterministic event responses, and industrial temperature tolerance. The 12-bit ADC with internal reference captures sensor and potentiometer inputs, while the event system triggers ADC conversions from timers without CPU intervention. The 50 GPIO pins drive LED indicators, keypads, and relay outputs directly. Industrial -40C to +85C operation supports factory and outdoor enclosures. The PDI debug interface allows in-system firmware updates through the boot section, simplifying field servicing. Compared with ATmega328P at the same price tier, this part delivers more peripherals and faster ADC throughput.
Recommended
Secure IoT Sensor Node
The ATXMEGA32C3-MHR's integrated AES and DES hardware crypto accelerator makes it a fit for secure IoT sensor nodes that require authenticated firmware and encrypted sensor telemetry. The 32 KB Flash stores TLS-style lightweight stacks or vendor-proprietary crypto protocols. The four-channel event system puts the MCU into sleep between sensor reads, dropping average current to microamp levels. The 1.6-3.6 V supply range allows direct battery connection (2xAA or Li coin cell) without an extra regulator. Compared with software crypto on Cortex-M0+, hardware AES runs 10-50x faster and with far lower energy per block.
Recommended
Building Automation Controller
For HVAC, lighting, and access control panels, the ATXMEGA32C3-MHR delivers enough peripheral count to replace multiple 8-bit MCUs in a single chip. The four USART/SPI/TWI peripherals connect to Modbus, BACnet, or KNX transceivers, while PWM channels drive lighting dimmers and motor controllers. Industrial temperature operation supports unheated equipment closets. The 32 KB Flash accommodates Modbus application-layer stacks plus custom automation logic. The PDI debug interface simplifies firmware updates through the boot section when commissioning new installations.
Recommended
Battery-Powered Data Logger
The ATXMEGA32C3-MHR's deep-sleep current in the microamp range, combined with the four-channel event system that wakes the CPU on ADC threshold or timer events, makes it well-suited for battery-powered data loggers. The 2 KB EEPROM stores calibration constants and small data records, while 4 KB SRAM buffers larger log pages before Flash write. Industrial temperature range supports unattended outdoor loggers. USB enables field-PC download without a separate serial cable. Compared with continuous-on data loggers, event-triggered designs extend battery life from weeks to years on a single 3 V coin cell.
Recommended
Consumer Audio Interface
The ATXMEGA32C3-MHR is a fit for USB audio interfaces, MIDI controllers, and digital audio mixers because of its full-speed USB device controller, multiple SPI/I2S peripherals for codec connection, and 12-bit DAC for monitoring. The 32 KB Flash hosts USB audio class drivers and DSP control logic. The event system synchronizes audio sample streaming to a timer interrupt without jitter. Industrial temperature range supports rack-mounted and touring equipment. Compared with STM32-based audio interfaces, this part offers a simpler toolchain and lower BOM cost for entry-level consumer products.
Recommended
Smart Sensor Hub
For multi-sensor IoT hubs aggregating temperature, humidity, motion, and gas readings, the ATXMEGA32C3-MHR offers enough ADC channels, I2C/SPI peripherals, and Flash to coordinate many sensors through a single MCU. The four-channel event system offloads sensor polling from the CPU, leaving MIPS for aggregation and uplink. The 1.6-3.6 V supply range allows direct battery or solar cell connection. The PDI debug interface simplifies field firmware updates. Compared with discrete-multiple MCU hubs, a single XMEGA design reduces BOM count, PCB area, and quiescent current.
Recommended
Recommended Products Summary
Engineering reference data for ATXMEGA32C3-MHR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATXMEGA32C3-MH | ATXMEGA32C3-AUR | ATXMEGA256C3-MH | ATXMEGA128D4-MH |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 256 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 16 KB | 8 KB |
| EEPROM | 2 KB | 2 KB | 2 KB | 4 KB | 2 KB |
| Max Clock | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| USB Interface | Full-speed USB Device | Full-speed USB Device | Full-speed USB Device | Full-speed USB Device | No (D4 family no USB) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Packaging | Tape & Reel | Tray | Tape & Reel | Tray | Tray |
Key Differentiators
- Integrated full-speed USB with on-chip PHY (vs ATXMEGA128D4-MH)
- Larger Flash than ATmega32U4-AU alternative (vs ATMEGA32U4-AU)
- Lower active current than 32-bit alternatives (vs ATSAMD21G18A-MU)
Design Notes
Estimated: At 32 MHz active CPU, the ATXMEGA32C3-MHR draws up to 12 mA from a 3.3 V supply (about 40 mW). Decoupling must use one 100 nF X7R ceramic per VCC pin plus a single 1 uF bulk capacitor within 5 mm of the QFN thermal pad. The thermal pad must be soldered to a continuous ground plane with at least 8 thermal vias to a bottom-side ground pour to keep junction temperature rise under 10 C above ambient at full load.
Place the 32.768 kHz watch crystal and 16 MHz main crystal within 5 mm of the XTAL pins to minimize parasitic capacitance. Route the PDI_DATA and PDI_CLK pins directly to a 2x5 0.05-inch programming header or Tag-Connect pads without crossing other signals. The QFN thermal pad stitching vias should be 0.3 mm diameter, 1 mm pitch, in a 4x4 grid for the 9x9 mm package. Keep analog ADC traces away from USB D+/D- and PWM signals to prevent coupling.
The full-speed USB D+ and D- lines require 22-ohm series resistors within 4 mm of the MCU pins, with trace impedance of 90 ohms differential to a USB Type-B or Mini-B connector. The D+ pull-up to 3.3 V (1.5 k-ohm) must be enabled by firmware only after VBUS detection to prevent bus contention when the host is not present. Avoid routing USB traces over ground plane splits; maintain a continuous reference plane beneath them.
Do not assume ATmega ISP programming works - the ATXMEGA32C3-MHR uses PDI, a 2-wire protocol, not classic AVR ISP. Connecting an AVR ISP or Arduino-as-ISP will not work. The 1.6 V minimum supply is below the typical 2.7-3.6 V AVR ISP voltage and may cause Flash programming failures if the supply sags under inrush. Finally, the AES/DES engine on the C3 variant is hardware-only - the API must be used in polling or interrupt mode; no DMA offload is available on the 32 KB Flash part.
Compliance Information
Microchip Green compliant per product page; industrial temperature grade -40C to +85C. Not AEC-Q100 qualified; for automotive choose Q1 suffix variants.
