ATSAML22N18A-CFUT - 32MHz Cortex-M0+ 256KB Flash MCU | Microchip
N.º de pieza: ATSAML22N18A-CFUT ✓ ActivoATSAML22N18A-CFUT Descripción general
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and a rich set of peripherals (timers, ADC, communication controllers). The Cortex-M0+ sits at the energy-efficient end of the ARM Cortex-M hierarchy (Cortex-M0+ -> Cortex-M0 -> Cortex-M3/M4), making the SAM L22N ideal for battery-powered and energy-harvesting products. The SAM L22N series specifically targets metering, sensor nodes, and human-machine interface applications that demand long battery life.
Key features include a 12-bit 1 Msps ADC with hardware oversampling, a 10-bit DAC, up to 6 SERCOM serial interfaces configurable as UART/SPI/I2C, a Segment LCD controller (SLCD) up to 8x40 segments, and an integrated Full-Speed USB 2.0 device/host controller. The device also includes an AES cryptographic engine, a True Random Number Generator (TRNG), a capacitive touch PTC peripheral, and a Peripheral Touch Controller supporting up to 256 channels.
The architecture combines the Cortex-M0+ core with a 2-channel DMA controller and a 12-channel event system that allows peripherals to communicate without CPU intervention, achieving ultra-low standby current. The 100-ball UFBGA package (6x6 mm) keeps the footprint comparable to competing LQFP-100 packages while providing better electrical performance for high-speed USB signalling.
Typical applications include smart electricity meters, water/gas meters, wireless sensor nodes, building automation, wearable health monitors, IoT edge devices, and human-machine interface (HMI) panels. The integrated SLCD controller and USB support reduce BOM cost in metering and HMI designs.
When designing with this MCU, allocate decoupling capacitors close to every VDD pin and route the USB DP/DM traces as a 90 ohm differential pair. Use the Atmel/Microchip START code-configurator and MPLAB X IDE to generate the SAML22 firmware framework and validate current consumption with the SAME54 Xplained Pro power-analysis tooling.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not consolidated in the manufacturer datasheet, providing engineers with an engineering-decision view beyond raw spec lists.
Alternativas directas para ATSAML22N18A-CFUT — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
ATSAML22G18A-CFUT
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ATSAML22N18A-AUT
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ATSAML22N18A-CFUT Valores máximos y características eléctricas
| Core | ARM Cortex-M0+ (32-bit) |
| Frecuencia de reloj máxima | 32 MHz |
| Program Memory (Flash) | 256 KB |
| Data Memory (SRAM) | 32 KB |
| Supply Voltage (VDD) | 1.6 V to 3.6 V |
| Active Current (CoreMark) | 39 uA/MHz |
| Backup Mode Current (RTC) | 490 nA |
| USB Controller | USB 2.0 Full-Speed Device/Host |
| ADC | 12-bit, 1 Msps, with hardware oversampling |
| DAC | 10-bit |
| SERCOM (configurable UART/SPI/I2C) | Up to 6 |
| Segment LCD Controller | Yes, up to 8x40 segments |
| AES Engine | Yes (256-bit) |
| TRNG | Yes |
| Capacitive Touch (PTC) | Up to 256 channels |
| DMA Channels | 12 |
| Event System Channels | 12 |
| Rango de temperatura de funcionamiento | -40 C to +85 C (industrial) |
| Encapsulado | 100-ball UFBGA (CFU), 6x6 mm |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Nivel MSL | 3 (per JEDEC J-STD-020) |
| Series | SAM L22N |
Guía de configuración de pines de ATSAML22N18A-CFUT 100-ball ufbga (cfu), 6x6 mm
Configuración de pines para ATSAML22N18A-CFUT (encapsulado 100-ball ufbga (cfu), 6x6 mm). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para ATSAML22N18A-CFUT.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ATSAML22N18A-CFUT es adecuado para 7 aplicacións: Smart Electricity Meter / Energy Metering, Wireless Sensor Node (LoRa/Zigbee/Thread End-Device), Capacitive Touch HMI Panel, Building Automation / HVAC Controller, Wearable Health Monitor, Battery-Powered IoT Edge / Data Logger, Human-Machine Interface (HMI) with Segmented LCD.
Smart Electricity Meter / Energy Metering
The ATSAML22N18A-CFUT is purpose-built for single-phase and multi-phase smart electricity meters, where its integrated Segment LCD controller (up to 8x40 segments) drives the on-glass display without an external LCD driver IC. The 256 KB Flash holds metering firmware plus DLMS/COSEM or IEC 62056-21 protocol stacks, while the 12-bit 1 Msps ADC with hardware oversampling achieves the accuracy class 1 (1%) or better required for revenue-grade metering. Active current of 39 µA/MHz and 490 nA backup current with RTC retention support the >10-year battery life expected for meter backup during mains outages.
Recomendado
Wireless Sensor Node (LoRa/Zigbee/Thread End-Device)
For battery-powered wireless sensor nodes (LoRaWAN, Zigbee, Thread, BLE-beacon), the ATSAML22N18A-CFUT serves as the application processor alongside an external radio transceiver. The Cortex-M0+ at 32 MHz is fast enough to run 6LoWPAN/IPv6 stacks, AES-256 hardware encryption secures join-credentials and over-the-air firmware updates, and the ultra-low 490 nA backup mode lets the node sleep between transmissions for years on a single CR2450 coin cell. The integrated USB 2.0 FS enables wired commissioning, firmware upgrade via USB stick, or USB-charging of Li-ion backup.
Recomendado
Capacitive Touch HMI Panel
The ATSAML22N18A-CFUT's integrated Peripheral Touch Controller (PTC) supports up to 256 capacitive touch channels with hardware-driven acquisition and noise immunity, removing the need for an external touch controller IC. Combined with the Segment LCD controller and 32 KB SRAM, the MCU can run a complete touch-HMI on a glass-overlay front panel - common in white goods, industrial controls, and medical device user interfaces. The 39 µA/MHz active current keeps total panel power under 30 mW even with continuous touch scanning.
Recomendado
Building Automation / HVAC Controller
For HVAC zone controllers, room thermostats, and lighting controllers, the ATSAML22N18A-CFUT combines the Segment LCD for temperature/setpoint display, six SERCOM ports for multiple sensor and communication links (I2C temp/humidity, SPI display, UART to HVAC bus), and USB for service-port updates. The wide 1.6-3.6 V supply range accommodates both 3.3 V logic and direct Li-ion battery backup. The AES-256 engine secures KNX/IP, BACnet, or proprietary building-automation protocol traffic.
Recomendado
Wearable Health Monitor
The ATSAML22N18A-CFUT's 490 nA backup current and 39 µA/MHz active current make it suitable for wearable health monitors (heart-rate, SpO2, activity) that run for 2-4 weeks on a small LiPo cell. The 12-bit 1 Msps ADC with hardware oversampling captures PPG and ECG waveforms at clinical-grade resolution, the AES-256 engine secures HIPAA-style health data transmission over BLE-to-phone, and the integrated USB enables direct charging and data sync without an external interface IC. The 6x6 mm UFBGA keeps PCB area under 30 mm^2.
Recomendado
Battery-Powered IoT Edge / Data Logger
For remote IoT data loggers (environmental, agricultural, asset-tracking), the ATSAML22N18A-CFUT offers the ideal blend of low power, 256 KB Flash for buffering months of sensor data, and USB for occasional in-field data extraction. The 12-channel event system wakes the CPU on sensor triggers without polling, conserving power. The 32 KB SRAM holds intermediate compression buffers, and the RTC with 490 nA backup mode keeps the wall-clock accurate across deep-sleep cycles lasting months.
Recomendado
Human-Machine Interface (HMI) with Segmented LCD
The integrated SLCD controller supports up to 8x40 segments (320 segments total) plus charge-pump bias generation, enabling direct connection to a low-cost glass segmented LCD without an external driver. Combined with the PTC capacitive touch, the ATSAML22N18A-CFUT drives a complete HMI in industrial controllers, point-of-sale terminals, and appliance front-panels. Designers can use Microchip's START code-configurator to autogenerate the LCD and touch HAL driver code, cutting firmware development time by 30-50%.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATSAML22N18A-CFUT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATSAML22G18A-CFUT | ATSAML22N18A-AUT | ATSAML21J18B-AUT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-ball UFBGA (6x6 mm) | 100-ball UFBGA (6x6 mm) - same | TQFP-100 | TQFP-64 |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Clock | 32 MHz | 32 MHz | 32 MHz | 48 MHz |
| Flash | 256 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB |
| USB | USB 2.0 FS Device/Host | USB 2.0 FS Device/Host | USB 2.0 FS Device/Host | USB 2.0 FS Device/Host |
| Segment LCD | Yes (8x40 segments) | Yes (8x40 segments) | Yes (8x40 segments) | Yes (smaller SLCD on 64-pin) |
Diferenciadores clave
- Integrated Segment LCD controller up to 8x40 segments (frente a ATSAML21J18B-AUT (Site MPN))
- True 490 nA backup-mode current with RTC retention (frente a Generic Cortex-M0+ MCU competitors)
- 256 KB Flash / 32 KB SRAM with USB 2.0 Full-Speed in UFBGA-100 (frente a ATSAML10E16A-MUT (Site MPN))
- PTC peripheral touch controller up to 256 channels (frente a External touch controller IC solutions)
Notas de diseño
Place a 1 µF X7R ceramic decoupling capacitor within 3 mm of each VDD pin and a 4.7 µF bulk capacitor near the MCU. For battery applications, route the RTC supply (VDD_RTC) from the main VDD through a ferrite bead to reduce noise-induced RTC drift. Use the SAM L22N backup mode with RTC retention to achieve 490 nA standby; configure all unused GPIOs as analog inputs with the input buffer disabled to eliminate parasitic leakage paths.
Route the USB DP/DM signals as a 90 Ω differential pair with matched length within 150 mil. Keep the pair on the same layer, avoid splits in the reference ground plane, and place the USB series termination resistors within 5 mm of the MCU balls. Place the 48 MHz external crystal (if used) within 4 mm of the XIN/XOUT balls, surrounded by a ground guard ring to minimize coupling from adjacent traces.
Do not enable the Segment LCD charge pump while running from < 1.8 V supply - this will cause brown-out reset. When migrating from SAM D20/D21 firmware, note that SAM L22N SERCOM numbering differs - always reference the pin-mux table in the datasheet rather than reusing SAMD21 port mappings. The PTC peripheral requires dedicated hardware acquisition timing; do not use software delays.
Estimated: at full 32 MHz active operation with all peripherals on, the ATSAML22N18A-CFUT dissipates approximately 50-70 mW in worst-case conditions. The 100-ball UFBGA exposes the die through the center balls; thermal relief requires at least 4 thermal vias in the BGA land pattern under the die. For sealed (no airflow) enclosures, derate ambient temperature by 5-8 °C relative to the datasheet maximum.
When using the 12-bit 1 Msps ADC, place a 10 nF X7R bypass capacitor close to the AVDD pin and route analog inputs on an inner layer with a solid ground reference. Avoid routing digital signals (SERCOM, PWM) parallel to analog traces on adjacent layers; if unavoidable, use orthogonal crossing and stitch the ground plane every 10 mm to suppress coupling.
Información de cumplimiento
RoHS compliant per Microchip product page. Green/Pb-free UFBGA package. Not AEC-Q100 qualified (industrial -40 to +85 C only).
