ATXMEGA128B3-MCU - 32MHz AVR MCU, 128KB Flash, USB | Microchip
Référence : ATXMEGA128B3-MCU ✓ ActifATXMEGA128B3-MCU Présentation
A microcontroller unit (MCU) is a single-chip computer integrating a processor core, program and data memory, and peripherals into one package. Within the hierarchy of embedded processors, the AVR XMEGA family sits between small 8-bit AVRs and 32-bit ARM cores, offering 8/16-bit RISC execution with the peripheral richness needed for human-interface and connectivity applications.
Key features include 128KB (128K x 8) of self-programming Flash with a 4KB boot code section, enabling field firmware updates over USB or other interfaces; a 4-channel event system that routes peripheral signals without CPU intervention; and a 2-channel DMA controller that offloads data movement for lower CPU load and power consumption.
Technically, the AVR RISC core executes most instructions in a single clock cycle, delivering up to 32 MIPS at 32 MHz. The integrated USB Full-Speed Device controller eliminates an external USB interface chip, while the 4x25 segment LCD driver with selectable drive schemes suits battery-powered metering and display products.
Typical applications include USB-connected instruments, industrial control panels with LCD displays, battery-powered metering devices, and consumer appliances requiring both USB and segment LCD interfaces.
When designing with this device, budget the VQFN-64 exposed-pad footprint for thermal and ground via connections, and verify Flash endurance and supply-voltage ranges against the manufacturer datasheet before finalizing power sequencing.
This page synthesizes distributor pricing from LCSC and Heisener, drop-in same-family alternatives, and practical design guidance not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour ATXMEGA128B3-MCU — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
ATXMEGA128B3-MCUR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATXMEGA256B3-MCU
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATXMEGA64B3-MCU
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATXMEGA64B3-MCUR
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
ATXMEGA128B3-MCU Valeurs maximales et caractéristiques électriques
| Core Architecture | 8/16-bit AVR RISC |
| Family | AVR XMEGA B3 |
| Fréquence d'horloge maximale | 32 MHz |
| Peak Performance | 32 MIPS |
| Flash Program Memory | 128KB (128K x 8), self-programming |
| Boot Code Section | 4KB |
| SRAM | 4KB |
| EEPROM | 2KB (2048 bytes) |
| DMA Controller | 2 channels |
| Event System | 4 channels |
| USB Interface | Full-Speed Device |
| LCD Controller | 4x25 segment |
| Boîtier | 64-VQFN (7x7 mm), dual rows, exposed pad |
| Type de montage | Surface Mount |
| Température de fonctionnement | -40C to +85C (industrial grade) |
Guide de configuration des broches du ATXMEGA128B3-MCU 64-vqfn (7x7 mm), dual rows, exposed pad
Configuration des broches du ATXMEGA128B3-MCU (boîtier 64-vqfn (7x7 mm), dual rows, exposed pad). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour ATXMEGA128B3-MCU.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ATXMEGA128B3-MCU convient pour 6 applications: USB-Connected Instruments, Industrial Control Panels with LCD, Battery-Powered Metering Devices, Consumer Appliance Controls, HVAC and Building Automation Nodes, Handheld Diagnostic Tools.
USB-Connected Instruments
The ATXMEGA128B3-MCU integrates a USB Full-Speed Device controller, letting instruments and lab devices connect directly to a PC at 12 Mbps without an external USB interface chip such as an FTDI or CP2102 bridge. Combined with the 4KB boot section and 128KB of self-programming Flash, the device supports USB DFU (Device Firmware Upgrade) boot loaders, so field firmware updates ride the existing USB cable with no programming header required. The 2-channel DMA moves USB endpoint data to SRAM without CPU cycles, keeping the 32 MHz AVR core free for measurement processing. A typical design places the 64-VQFN device on the USB bus with 22-ohm series resistors on D+/D- and uses the spare headroom for protocol stacks. The trade-off is 8-bit throughput: high-rate streaming beyond a few hundred kB/s is limited versus 32-bit MCUs.
Recommandé
Industrial Control Panels with LCD
The on-chip 4x25 segment LCD controller makes the ATXMEGA128B3-MCU well suited to industrial panels and operator interfaces that need a monochrome readout without an external LCD driver IC. Segment LCDs draw microwatts of power, so the combination of on-chip drive and the AVR event system - which routes timer, ADC, and communication events between peripherals without waking the CPU - delivers low average power in always-on panel products. The 128KB Flash accommodates protocol stacks (Modbus, CAN via software), menus, and multi-language strings, while the 2-channel DMA offloads UART traffic. In a typical panel, the MCU drives the segment glass directly, reads a keypad matrix on GPIO, and communicates upstream over USB or UART. Designers should confirm drive-waveform options and bias levels in the XMEGA B manual, as glass specifications vary by LCD supplier.
Recommandé
Battery-Powered Metering Devices
Utility submeters, energy monitors, and portable measurement devices benefit from the ATXMEGA128B3-MCU's blend of low-power design patterns and integrated peripherals. The event system lets an ADC conversion trigger from a timer and its result move to SRAM via DMA with the CPU remaining asleep, minimizing active duty cycle on a coin cell or battery pack. The 2KB EEPROM stores calibration constants and cumulative energy registers without external memory, and the 128KB Flash supports both application code and a DFU boot loader for field recalibration. The 4x25 segment LCD shows readings at microwatt cost. A practical design sequences power via an LDO such as the AP2210K-3.3TR and periodically wakes the MCU on a RTC tick. Exact sleep-mode currents must be taken from the AVR XMEGA B manual electrical characteristics when calculating battery life.
Recommandé
Consumer Appliance Controls
White-goods and appliance control boards use the ATXMEGA128B3-MCU where a segment LCD, touch-button GPIO scanning, and a USB service port must coexist in one low-cost chip. The 32 MHz AVR core provides 32 MIPS, ample for PID loops on heaters or motors, AC zero-cross detection, and UI state machines running concurrently. The 128KB self-programming Flash allows manufacturing-line configuration and firmware updates through the USB port during servicing, eliminating a separate ISP connector on cost-driven boards. The 4-channel event system synchronizes PWM generation with ADC sampling for closed-loop control without software jitter. In appliance environments, designers should add RC filtering and TVS protection on switch inputs, and verify the -40C to +85C industrial grade covers the enclosure temperature near motors. EMI performance follows standard AVR layout practice with solid ground return via the exposed pad.
Recommandé
HVAC and Building Automation Nodes
Building automation nodes - thermostat controllers, zone dampers, and sensor gateways - fit the ATXMEGA128B3-MCU well because it combines a segment LCD for local status, 128KB Flash for communication protocol stacks, and USB for commissioning from a laptop. The DMA controller keeps UART or software-communication traffic flowing while the core handles control algorithms, and the 4-channel event system links hardware timers to ADC sampling for periodic sensor acquisition without CPU wake-ups, extending battery-backed operation. The 2KB EEPROM stores network addresses and setpoint tables through power cycles. In a typical node, the MCU runs the control loop at 32 MHz, displays temperature on the LCD, and uses the USB port only during installation. Verify the -40C to +85C industrial rating against rooftop enclosure temperatures, and provision the 4KB boot section for remote firmware updates.
Recommandé
Handheld Diagnostic Tools
Portable diagnostic and test gadgets use the ATXMEGA128B3-MCU as a single-chip solution for USB data upload, monochrome LCD display, and signal acquisition. The 32 MIPS AVR core executes measurement math and button-driven menus responsively, while the integrated USB Full-Speed Device controller streams logged results to desktop software - no bridge chip or extra connector needed. The 2-channel DMA and event system sample ADC channels on precise timer triggers, improving measurement repeatability over purely software-timed loops. With 128KB Flash and a 4KB boot section, manufacturers ship a USB DFU boot loader so end customers can update tool firmware, and the 2KB EEPROM retains calibration across battery swaps. Design trade-off: the 8/16-bit core lacks hardware floating point, so computationally heavy DSP (e.g., fast FFT) should use fixed-point arithmetic or an external co-processor.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATXMEGA128B3-MCU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATXMEGA128B3-MCUR | ATXMEGA256B3-MCU | ATXMEGA64B3-MCU |
|---|---|---|---|---|
| Package | 64-VQFN (7x7 mm) exposed pad | 64-VQFN (7x7 mm) - same | 64-VQFN (7x7 mm) - same | 64-VQFN (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Max Clock | 8/16-bit AVR, 32 MHz (32 MIPS) | 8/16-bit AVR, 32 MHz | 8/16-bit AVR, 32 MHz | 8/16-bit AVR, 32 MHz |
| Flash Program Memory | 128KB (4KB boot section) | 128KB | 256KB (2x) | 64KB (-50%) |
| SRAM / EEPROM | 4KB / 2KB | 4KB / 2KB | 4KB / 2KB | 4KB / 2KB |
| USB | Full-Speed Device | Full-Speed Device | Full-Speed Device | Full-Speed Device |
| LCD Controller | 4x25 segment | 4x25 segment | 4x25 segment | 4x25 segment |
| DMA / Event System | 2 channels / 4 channels | 2 ch / 4 ch | 2 ch / 4 ch | 2 ch / 4 ch |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Industrial |
Principaux différenciateurs
- Double the program Flash within the same footprint (vs ATXMEGA64B3-MCU)
- Integrated USB Full-Speed Device plus segment LCD in one chip (vs ATXMEGA16E5-MU)
- Same silicon with production-friendly reel packing (vs ATXMEGA128B3-MCUR)
Notes de conception
The ATXMEGA128B3-MCU is supplied in a 64-VQFN (7x7 mm) dual-row package with an exposed pad. The exposed pad is the primary ground and thermal path: define an array of via-in-pad or perimeter vias (typically 5x5) connecting to the ground plane, and design the footprint to the Microchip recommended land pattern rather than the mechanical outline. Dual-row QFN parts are sensitive to paste-geometry asymmetry, so use the datasheet stencil recommendation to prevent bridging between rows during reflow. Inspection under X-ray is recommended for first-article runs of dual-row no-lead packages.
Estimate: at 32 MHz the XMEGA AVR core consumes on the order of tens of milliamps of active current (take the exact figure from the XMEGA B manual electrical characteristics - this note uses a generic 20 mA estimate for budgeting only). Decouple each VCC/VDDIO pin pair with 100 nF ceramics placed within 2 mm of the pins, plus one bulk 4.7-10 uF per supply domain. If USB is used, follow the USB spec bus-powered budget of 100 mA for unconfigured devices and configure pull-ups via the on-chip USB peripheral rather than external resistors.
Reserve the 4KB boot section early: once the boot loader occupies it and the application is locked, changing the bootloader/appl ication split requires full-chip rework. If USB firmware updates (DFU) are planned, implement and verify the boot loader before locking security fuses. Also note the -MCU vs -MCUR ordering suffix: -MCU is tray packed, -MCUR is tape and reel; ordering the wrong suffix disrupts SMT line feeding. Finally, the XMEGA B3 is a legacy Microchip AVR series - for programs expected to run beyond the mid-2030s, qualify a modern Microchip part in parallel.
Informations de conformité
Compliance status was not stated in the provided web data. Industrial-grade (-40C to +85C) per distributor parameter data. Verify RoHS/REACH status on the official Microchip product page or certificate of conformance.
