ATXMEGA16A4-MH - 32MHz 16KB AVR MCU | Microchip Technology
Teilenummer: ATXMEGA16A4-MH ✗ AbgekündigtATXMEGA16A4-MH Übersicht
An 8/16-bit AVR microcontroller is a compact embedded-processing component that combines a CPU core, Flash program memory, data memory, and peripherals on one semiconductor die. Within the product hierarchy, ATXMEGA16A4-MH belongs to the AVR XMEGA family, the XMEGA A4 series, microcontrollers, and the broader embedded-processing semiconductor category. Its enhanced AVR RISC architecture supports applications requiring deterministic peripheral control and efficient low-power operation.
Key features include four-channel direct-memory-access support, an eight-channel event system, a programmable multilevel interrupt controller, and 34 general-purpose I/O lines. The peripheral set also includes a 16-bit real-time counter, five flexible 16-bit timer/counters with compare and PWM modes, five USARTs, and internal read-while-write Flash operation. These resources reduce the need for external interface and timing components in compact control systems.
The XMEGA A4 architecture combines single-cycle instruction execution with integrated DMA, event routing, and interrupt priorities. Five USARTs allow multiple serial links to coexist, while the event system can connect peripherals without continuous CPU intervention. The 32 MHz operating speed and 16 KB Flash capacity are suitable for compact embedded products that need substantial serial communications, timing, and general-purpose I/O without moving to a larger package or higher-memory device.
Typical applications include industrial control modules, multi-interface data acquisition units, building automation controllers, serial protocol bridges, compact instrumentation, and low-power embedded gateways. Designers can use the USARTs for service, sensor, and host interfaces; the timer/counters for motor, PWM, or waveform functions; and the event system to coordinate peripheral actions efficiently.
A primary design consideration is lifecycle planning. The Microchip product page identifies ATXMEGA16A4 as not recommended for new designs and directs new projects toward the XMEGA AU series. Existing designs should therefore validate package, firmware, supply, and qualification requirements before migration, while new projects should assess whether the recommended successor offers a practical path.
This product overview combines manufacturer specifications, lifecycle guidance, drop-in candidate evaluation, interface-oriented design guidance, and application selection criteria to support faster engineering review and sourcing decisions.
Drop-in-Alternativen für ATXMEGA16A4-MH – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ATXMEGA16A4-MH (gleiche Bauform und Footprint) – abweichend in DMA Channels, EEPROM, Event System Channels, External Bus Interface, Package.
ATXMEGA16A4U-MH
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ATXMEGA32A4U-MH
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ATXMEGA64A4U-MH
✅ Drop-InPreis auf Anfrage
Datenblatt ansehen →ATXMEGA16A4-MH Grenzwerte & elektrische Eigenschaften
| Product Type | 8/16-bit AVR RISC microcontroller |
| Series | AVR XMEGA A4 |
| Maximum Clock Speed | 32 MHz |
| Flash Program Memory | 16 KB |
| Boot Code Section | 4 KB |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Operating Voltage Range | 1.6 V to 3.6 V |
| Gehäuse | 44-pin VQFN, 7 x 7 mm |
| General-Purpose I/O Lines | 34 lines |
| DMA Channels | 4 channels |
| Event System Channels | 8 channels |
| Real-Time Counter | 16-bit |
| Timer/Counter Count | 5 x 16-bit |
| USART Count | 5 |
| External Bus Interface | Supported |
| Flash Read-While-Write | Supported |
ATXMEGA16A4-MH 44-pin vqfn, 7 x 7 mm Pinbelegungsleitfaden
Pinbelegung für ATXMEGA16A4-MH (44-pin vqfn, 7 x 7 mm-Gehäuse). Dieser digitale IC umfasst GPIO, Kommunikationsschnittstellen (UART, SPI, I2C) und Versorgungspins. Alternative Pin-Funktionen und Konfigurationsoptionen entnehmen Sie dem Herstellerdatenblatt. Unverzichtbar für Embedded-System-Design und PCB-Layout.
Keine detaillierten Pinbelegungsdaten verfügbar für ATXMEGA16A4-MH.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
ATXMEGA16A4-MH ist geeignet für 6 Anwendungs: Industrial Control Module, Multi-Serial Protocol Gateway, Data Acquisition and Sensor Node, Building Automation Controller, Compact Instrumentation Controller, Existing-System Maintenance Upgrade.
Industrial Control Module
ATXMEGA16A4-MH fits compact industrial controllers that coordinate sensors, actuators, and service communications through a limited pin count. Its 34 GPIO lines support discrete inputs, relay outputs, status indicators, and machine-interface signals, while the 32 MHz clock provides useful headroom for protocol handling and supervisory logic. The four-channel DMA controller and eight-channel event system help move data and trigger peripherals without excessive processor intervention. Five USARTs allow local sensors, converters, and maintenance equipment to communicate concurrently. According to the Microchip manufacturer datasheet, the device combines five 16-bit timer/counters with PWM and compare modes, making it appropriate for timing-sensitive motor, lighting, and pulse-control functions in a 44-pin VQFN package.
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Multi-Serial Protocol Gateway
The five USARTs in ATXMEGA16A4-MH make it well suited to bridging or monitoring several serial devices within one compact assembly. Each serial interface can connect to a sensor, modem, controller, or configuration port, while the event system coordinates requests and responses without requiring every transfer to pass through a polling loop. The 16 KB Flash stores protocol and routing firmware, and the 4 KB boot section can support controlled startup behavior. According to the Microchip manufacturer datasheet, the 32 MHz enhanced AVR core executes instructions efficiently, while the 1 KB EEPROM provides nonvolatile configuration storage. The result is a useful architecture for industrial gateways, instrumentation adapters, and service-console controllers where board area and serial interface count matter.
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Data Acquisition and Sensor Node
ATXMEGA16A4-MH can coordinate compact sensor acquisition systems that combine periodic measurement, local filtering, and event-driven reporting. The four-channel DMA controller is valuable for transferring sampled data with limited CPU involvement, while the event system can route timer, communication, and external signals between peripherals. Thirty-four GPIO lines provide connections for sensors, interrupt inputs, and control outputs without requiring a larger package. According to the Microchip manufacturer datasheet, five 16-bit timer/counters support precise capture and compare functions, and five USARTs permit simultaneous links to external transducers or a host. Its 2 KB SRAM and 1 KB EEPROM are suited to modest buffers and persistent calibration data in low-power industrial or environmental monitoring equipment.
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Building Automation Controller
ATXMEGA16A4-MH suits distributed building-control modules that must manage multiple low-speed field interfaces and deterministic local functions. The device's five USARTs can serve separate room controllers, access panels, meters, or service ports, while 34 GPIO lines address digital inputs, relays, indicators, and alarm signals. Its programmable multilevel interrupt controller helps prioritize events when multiple peripheral sources require attention. According to the Microchip manufacturer datasheet, the event system and DMA controller reduce the processing burden associated with routing and moving peripheral data. The 16-bit real-time counter and five flexible 16-bit timer/counters also support scheduling and PWM functions. Its 44-pin VQFN footprint helps reduce board area in wall-mounted controls, room modules, and compact HVAC interface boards.
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Compact Instrumentation Controller
ATXMEGA16A4-MH can serve as the control processor in compact laboratory or field instruments where display-independent measurement, timing, and serial communication must coexist. Five 16-bit timer/counters provide separate resources for sampling intervals, pulse measurement, compare events, and PWM generation, reducing the need to multiplex timing functions in software. The five USARTs can connect to measurement front ends, calibration storage, a computer interface, or service diagnostics. According to the Microchip manufacturer datasheet, the microcontroller includes read-while-write Flash operation, 2 KB SRAM, and 1 KB EEPROM, supporting a practical split between resident firmware, working data, and persistent configuration. The 1.6 V to 3.6 V operating range also supports low-voltage portable instrument designs when the selected external circuitry meets the device requirements.
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Existing-System Maintenance Upgrade
ATXMEGA16A4-MH is most relevant when maintaining an existing 44-pin VQFN XMEGA A4 board rather than beginning a new product. Its 32 MHz clock, 16 KB Flash, five USARTs, and 34 GPIO lines preserve the established architecture of the original design and can simplify repair or board-extension work. According to the Microchip product page, the device is not recommended for new designs, so continuity programs should verify supply availability, component revisions, and long-term support requirements. An A4U-family candidate may provide a path where USB is useful, but firmware and peripheral mapping must be reviewed before substitution. For maintenance applications, preserving the exact MCU, clock configuration, programming method, and memory organization is generally safer than assuming a related family is functionally identical.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ATXMEGA16A4-MH – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ATXMEGA16A4U-MH | ATXMEGA32A4U-MH | ATXMEGA64A4U-MH |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-VQFN (7x7 mm) | 44-VQFN (7x7 mm) - same package | 44-VQFN (7x7 mm) - same package family | 44-VQFN (7x7 mm) - same package family |
| Maximum Clock Speed | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Flash Program Memory | 16 KB | 16 KB | 32 KB | 64 KB |
| USB Device Controller | Not documented | USB 2.0 full-speed device controller | USB 2.0 full-speed device controller | USB 2.0 full-speed device controller |
Wichtigste Unterscheidungsmerkmale
- Exact 16 KB Flash match for existing A4 memory partitions (vs. ATXMEGA32A4U-MH)
- No USB dependency in the original A4 configuration (vs. ATXMEGA16A4U-MH)
- Lower Flash capacity supports simpler legacy firmware (vs. ATXMEGA64A4U-MH)
Designhinweise
Use the manufacturer package drawing for the 44-pin VQFN exposed-pad layout rather than a generic 44-pin QFN footprint. Confirm pad dimensions, exposed-pad area, solder-mask opening, paste pattern, and land-pattern tolerances directly against the official ATXMEGA A4 package information. Route the exposed pad to the intended ground or power plane only as specified by the datasheet, and preserve the manufacturer-recommended thermal-via arrangement.
Design the 1.6 V to 3.6 V supply rail and decoupling from the manufacturer electrical-characteristics table. Place the required input and output capacitors close to their associated device pins, verify effective capacitance and tolerance at the selected voltage, and account for ESR or DC-bias characteristics where ceramic capacitors are used. Confirm clock, USART, DMA, and event-system activity against the voltage and frequency limits before finalizing the power architecture.
Do not assume that every 44-pin XMEGA A4 variant is a functional substitute. ATXMEGA16A4U-MH adds USB device capability, while the larger-memory A4U candidates can change Flash limits, interrupt behavior, and firmware resource requirements. For a maintenance replacement, compare the complete pin-description table, peripheral assignments, clock tree, boot configuration, programming interface, and application firmware before approving a substitution.
Separate sensitive communication and timing signals from noisy switching nodes wherever the board stack-up permits. Keep clock and high-speed serial traces short, provide a continuous return path, and place decoupling and support components near the relevant pins. Review package-specific escape routing before finalizing a dense layout because the 7 x 7 mm VQFN footprint limits access between pins and makes exposed-pad thermal management part of the high-density escape strategy.
Compliance-Informationen
The manufacturer product page identifies the XMEGA A4 family as not recommended for new designs. No specific RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification statement was identified for this exact suffix.
