ATXMEGA16C4-MH - 32MHz 16KB Flash 44-VQFN AVR XMEGA MCU | Microchip Technology
MPN: ATXMEGA16C4-MH ✗ End of LifeATXMEGA16C4-MH Overview
An 8/16-bit MCU is a programmable semiconductor controller designed to execute firmware, monitor peripherals, and manage digital I/O in embedded systems. The ATXMEGA16C4 belongs to the broader hierarchy of embedded microcontroller, microcontroller IC, and semiconductor devices. Its AVR XMEGA architecture combines a high-performance 8/16-bit CPU with programmable event handling and interrupt resources for responsive control systems.
Key resources include 16 KB Flash memory, including a 4 KB boot-code section, 1 KB EEPROM, and 2 KB SRAM. The manufacturer describes read-while-write capability, a four-channel event system, a programmable multi-level interrupt controller, and 34 general-purpose I/O pins. These resources suit compact control, sensor, communications, and embedded interface designs where deterministic event handling and moderate memory capacity are useful.
The ATXMEGA16C4-MH operates from a 1.6 V to 3.6 V supply and supports a 32 MHz maximum clock. It belongs to the low-power AVR XMEGA product family, making it appropriate for battery-operated and energy-conscious equipment when the system can operate within the device's specified electrical limits. The -MH ordering code identifies the 44-VQFN industrial-temperature package configuration.
Typical applications include industrial sensor controllers, compact instrumentation, low-power data acquisition, communication equipment, building-control nodes, and general embedded control products. Designers should preserve the VQFN land pattern, provide the required power and decoupling arrangement, and verify programming, clock, and peripheral assignments against the manufacturer documentation before releasing a PCB.
A key design consideration is that the 44-VQFN package has a fine-pitch, exposed-pad construction that requires careful assembly and thermal planning. The device also has limited memory compared with larger XMEGA members, so firmware organization and boot-code allocation should be confirmed early. This page combines the exact device characteristics with application guidance, sourcing information, and the constraints needed for an engineering review.
Drop-in alternatives for ATXMEGA16C4-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 ATXMEGA16C4-MH (same form factor and footprint) — differing in Flash Memory, Package, Temperature Grade.
ATXMEGA32C4-MH
✅ Drop-InContact for price
View Datasheet →ATXMEGA16C4-MH Maximum Ratings & Electrical Characteristics
| Product Type | 8/16-bit AVR XMEGA microcontroller |
| Maximum Clock Frequency | 32 MHz |
| Flash Memory | 16 KB |
| Flash Organization | 8K x 16 |
| Boot Code Section | 4 KB |
| EEPROM Memory | 1 KB |
| SRAM | 2 KB |
| Operating Supply Voltage | 1.6 V to 3.6 V |
| Package | 44-VQFN (7 x 7 mm) |
| General-Purpose I/O Pins | 34 |
| Event System Channels | 4 |
| Flash Read-While-Write | Supported |
| Interrupt Controller | Programmable multi-level interrupt controller |
| Architecture | AVR XMEGA |
| Core Type | 8/16-bit |
| Mounting Type | Surface mount |
| Temperature Grade | Industrial temperature |
ATXMEGA16C4-MH 44-vqfn (7 x 7 mm) Pin Configuration Guide
Pin configuration for ATXMEGA16C4-MH (44-vqfn (7 x 7 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 ATXMEGA16C4-MH.
Refer to the datasheet for full pin configuration.
Typical Applications
ATXMEGA16C4-MH is suitable for 6 applications: Industrial Sensor Controller, Battery-Powered Data Acquisition, Communication Equipment, Building Control Node, Compact Instrumentation, Motorized Equipment Control.
Industrial Sensor Controller
The ATXMEGA16C4-MH fits compact industrial sensor nodes that combine several inputs with local control. Its 34 general-purpose I/O pins can support digital sensors, status indicators, and actuator-control signals, while the four-channel event system can coordinate time-sensitive events without excessive polling. The 1.6 V to 3.6 V operating range allows integration with low-voltage sensor and communication circuitry. Firmware can use the 2 KB SRAM for short acquisition buffers and the 1 KB EEPROM for retained parameters. The 32 MHz clock provides additional response margin for signal conditioning, filtering, and protocol handling, subject to the device's documented electrical limits.
Recommended
Battery-Powered Data Acquisition
The ATXMEGA16C4-MH is appropriate for compact, battery-powered data-acquisition equipment where the 16 KB Flash, 2 KB SRAM, and 1 KB EEPROM are sufficient for the application. Low-power AVR XMEGA operation can help reduce energy use when firmware uses sleep modes between samples. Its 32 MHz clock supports responsive acquisition and local filtering, while 34 I/O pins provide room for sensors and controls. Power-budget calculations should include sensor consumption, regulator quiescent current, wake-up behavior, and leakage rather than considering microcontroller current alone.
Recommended
Communication Equipment
ATXMEGA16C4-MH can serve as the control MCU in compact communication equipment requiring moderate processing speed and deterministic event handling. The four-channel event system and programmable multilevel interrupt controller are useful for coordinating serial traffic, timers, and status inputs. Its 34 I/O pins leave capacity for a radio interface, status LEDs, and control signals. Choose external transceivers and connectors to match the required protocol and isolation needs. Firmware architecture must account for the limited 16 KB Flash and 2 KB SRAM, especially when adding buffering, framing, and update logic.
Recommended
Building Control Node
The ATXMEGA16C4-MH suits low-cost building-control nodes that monitor inputs and operate local relays or indicators. The industrial-temperature ordering option supports use in controlled indoor environments, and the 34 I/O pins allow multiple digital channels to be assigned to sensors, switches, or outputs. Event-system resources can coordinate periodic sampling and scheduled actions, while the interrupt controller supports responsive handling of external events. The 1.6 V to 3.6 V range fits low-voltage electronics, though relay drivers, flyback protection, and a suitably rated supply should be designed separately.
Recommended
Compact Instrumentation
The ATXMEGA16C4-MH is well matched to compact instrumentation that performs local measurement, calibration, and display updates. Its 32 MHz operating capability provides useful timing margin for sampling and control loops, while the four-channel event system can synchronize multiple internal workflows. Sixteen kilobytes of Flash can store firmware and fixed parameters, and the 1 KB EEPROM can retain calibration values if the application limits write cycles appropriately. An external ADC may be required when the measurement dynamic range exceeds the integrated peripheral set; the final signal chain must be reviewed against the manufacturer's device documentation.
Recommended
Motorized Equipment Control
ATXMEGA16C4-MH can supervise stepper, valve, or small actuator systems where precise timing and event coordination are important. The four-channel event system can support deterministic timing tasks, while 34 I/O pins provide outputs for direction, enable, home, and limit signals. The 16 KB Flash footprint is suitable for compact control firmware when supervisory logic is modest. External MOSFET drivers, current sensing, flyback paths, and protection are required as appropriate; the MCU should not directly carry motor current. Firmware should include startup limits and safe-state behavior for sensor or driver faults.
Recommended
Recommended Products Summary
Engineering reference data for ATXMEGA16C4-MH — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATXMEGA32C4-MH |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 44-VQFN (7 x 7 mm) | 44-VQFN (7 x 7 mm) |
| Maximum Clock Frequency | 32 MHz | 32 MHz |
| Architecture | AVR XMEGA | AVR XMEGA |
| Core Type | 8/16-bit | 8/16-bit |
| Temperature Grade | Industrial temperature | Industrial temperature |
Key Differentiators
- Memory configuration aligned with compact embedded control (vs ATXMEGA32C4-MH)
- Compact 44-VQFN footprint (vs ATXMEGA32C4-MH)
- Deterministic event and interrupt resources (vs ATXMEGA32C4-MH)
Design Notes
Assign the 44-VQFN footprint by mechanical drawing rather than by name alone, because exposed-pad dimensions and land patterns can differ between manufacturers. Confirm pin numbering, pad dimensions, solder-mask clearance, and the exposed thermal pad against the official package drawing. Place the device according to the recommended PCB footprint and provide a stable ground reference beneath the thermal pad.
The 44-VQFN package concentrates heat through its exposed pad. Provide a continuous ground or thermal copper area, minimize thermal voids, and use the manufacturer's recommended PCB land pattern. Calculated junction temperature must include copper area, board material, surrounding components, ambient temperature, and the device's package thermal data. Do not assume that a small copper area is adequate for sustained 32 MHz operation.
Design the 1.6 V to 3.6 V supply rail so that its tolerance, startup ramp, ripple, and noise remain inside the device requirements. Place the manufacturer's recommended decoupling capacitance close to the supply and ground pins with a short, low-inductance path. Account for the maximum operating frequency and active peripherals when sizing the supply; the 32 MHz clock rating does not by itself define a complete power budget.
Do not approve a replacement solely because it is labeled ATXMEGA and uses a similar VQFN outline. Validate every power, ground, analog, programming, and communications pin, along with peripheral alternate functions and interrupt mappings. For ATXMEGA32C4-MH, also check linker placement, Flash usage, SRAM requirements, and boot-code assumptions. Firmware compiled for one memory configuration is not automatically safe on another.
Compliance Information
No explicit compliance statements are present in the manufacturer product-page excerpt or exact-MPN distributor results.
