ATSAML22N16A-CFUT - Ultra-Low-Power ARM M0+ MCU 64KB Flash | Microchip
MPN: ATSAML22N16A-CFUT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.1 | $4.10 |
| 10 | $3.69 | $36.90 |
| 100 | $3.28 | $328.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.65 | $2,650.00 |
ATSAML22N16A-CFUT Overview
What is an ultra-low-power microcontroller? An ultra-low-power MCU is a microcontroller that combines a low-power CPU core (often ARM Cortex-M0+ or M4) with multiple low-power operating modes (active, idle, standby, backup, deep-sleep, off), low-leakage peripherals, and event-driven wake-up logic. It sits within the broader taxonomy of microcontrollers -> embedded processors -> semiconductor ICs. Engineers reach for ultra-low-power MCUs like the SAM L22 when average current draw must drop into the µA/nA range so that coin cells, lithium thionyl chloride cells, or harvested energy sources can last for years.
Key features include Cortex-M0+ core at 32 MHz with single-cycle I/O access, 64 KB Flash, 8 KB SRAM, full-speed USB device with internal pull-up and 1.5 K endpoints, Segment LCD controller driving up to 8 COM x 25 SEG, two SERCOM (USART/SPI/I2C) channels, 12-bit ADC and DAC, and an integrated PTC (Peripheral Touch Controller) supporting capacitive touch buttons and sliders. Active-mode current is specified at 39 µA/MHz running CoreMark, while ultra-low-power backup mode with RTC reaches 490 nA.
The SAM L22 architecture pairs the Cortex-M0+ core with Microchip's proprietary low-power techniques, including multiple clock domains, peripheral event system, and SleepWalking for DMA-driven peripheral operation without CPU intervention. BOD, brown-out reset, watchdog timer, and a 32 kHz RTC make the part suitable for metering and industrial sensor nodes.
Typical applications include battery-powered IoT sensor nodes, medical wearables, smart meters and energy harvesting, consumer health devices, Segmented LCD user interfaces, USB-CDC class devices, and capacitive-touch human-machine interfaces. The wide 1.6 V - 3.6 V range and ARM Cortex ecosystem support firmware reuse across the SAM family.
When designing with this device, evaluate total average power including wake/sleep duty cycle rather than peak current. Use the SAM L22's peripheral event system and SleepWalking to keep the CPU asleep while ADC, SERCOM, or RTC handle I/O autonomously.
This page synthesizes distributor pricing, drop-in alternatives, comparison parameters, and practical design notes not aggregated in the manufacturer datasheet.
Drop-in alternatives for ATSAML22N16A-CFUT — 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 ATSAML22N16A-CFUT (same form factor and footprint) — differing in ADC, Program Memory (Flash), SRAM, Communication Interfaces, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAML22N16A-AUT
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →ATSAML22J16A-MUT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAML22G16A-MUT
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →ATSAML11D16A-YU
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAML22G17A-UUT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAML22N16A-CFUT Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M0+ |
| Core Size | 32-Bit |
| Maximum Clock Frequency | 32 MHz |
| Program Memory Size (Flash) | 64 KB (64K x 8) |
| RAM Size | 8 KB |
| Supply Voltage Range | 1.6 V to 3.6 V |
| Package Type | 100-UFBGA (6x6 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +85C (industrial) |
| Active Mode Current | 39 uA/MHz (CoreMark) |
| Ultra-Low-Power Backup Current (RTC) | 490 nA (typical) |
| USB Interface | Full-Speed USB Device with internal pull-up |
| ADC | 12-bit SAR |
| DAC | 10-bit / 12-bit |
| Segment LCD Controller | Yes (up to 8 COM x 25 SEG) |
| Capacitive Touch (PTC) | Peripheral Touch Controller |
| Number of I/O | 82 (typical for SAM L22 100-pin) |
| RoHS Status | Compliant |
ATSAML22N16A-CFUT Pin Configuration
| Pin A1 | VDDIO — I/O supply voltage |
| Pin A2 | PB02 — I/O pin / ADC input |
| Pin A3 | PB03 — I/O pin / ADC input |
| Pin A4 | PB04 — I/O pin |
| Pin A5 | GND — Ground reference |
| Pin B1 | PA00 — I/O / XIN |
| Pin B2 | PA01 — I/O / XOUT |
| Pin B3 | PA02 — I/O / ADC |
| Pin B4 | VBAT — Backup RTC battery supply |
| Pin B5 | VSS — Ground reference |
| Pin C1 | PA05 — I/O / SERCOM0 PAD |
| Pin C2 | PA06 — I/O / SERCOM0 PAD |
| Pin C3 | PA07 — I/O / SERCOM0 PAD |
| Pin C4 | PA08 — I/O / SERCOM0 PAD |
| Pin C5 | PA09 — I/O / SERCOM0 PAD |
| Pin D1 | PA15 — I/O / SERCOM2 |
| Pin D2 | PA16 — I/O / SERCOM2 |
| Pin D3 | PA17 — I/O / SERCOM2 |
| Pin D4 | PA18 — I/O / SERCOM2 |
| Pin D5 | PA19 — I/O / SERCOM2 |
| Pin E1 | PA20 — I/O / SERCOM3 |
| Pin E2 | PA21 — I/O / SERCOM3 |
| Pin E3 | PB06 — I/O / ADC |
| Pin E4 | PB07 — I/O / ADC |
| Pin E5 | PB08 — I/O / ADC |
| Pin F1 | PB09 — I/O / ADC |
| Pin F2 | PB10 — I/O / TC |
| Pin F3 | PB11 — I/O / TC |
| Pin F4 | PA22 — I/O / SERCOM3 |
| Pin F5 | PA23 — I/O / SERCOM3 |
| Pin G1 | PA27 — I/O / USB DP |
| Pin G2 | GND — Ground |
| Pin G3 | VSS — Ground |
| Pin G4 | PB12 — I/O / TC |
| Pin G5 | PA24 — I/O / USB DM |
| Pin H1 | RESETn — Reset input (active low) |
| Pin H2 | SWDIO — SWD data |
| Pin H3 | SWCLK — SWD clock |
| Pin H4 | PB13 — I/O / TC |
| Pin H5 | PB14 — I/O / TC |
| Pin J1 | PA30 — I/O / SWO |
| Pin J2 | PA31 — I/O / Bootloader |
| Pin J3 | VDDCORE — Internal core voltage output (cap only) |
| Pin J4 | VDDIO — I/O supply |
| Pin J5 | PB15 — I/O / TC |
Typical Applications
ATSAML22N16A-CFUT is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Smart Metering and Energy Harvesting, Wearable Health and Fitness Devices, Capacitive Touch Human-Machine Interfaces, Industrial Sensor and Control Modules, Consumer Electronics with Segment LCD.
Battery-Powered IoT Sensor Nodes
ATSAML22N16A-CFUT fits battery-powered IoT nodes because its 39 uA/MHz active current and 490 nA backup current (RTC) allow coin-cell designs to achieve multi-year life. The Cortex-M0+ core plus SleepWalking peripheral event system lets the MCU handle ADC reads, SERCOM I/O, and capacitive-touch wake-up without waking the CPU. Place a CR2032 or two-cell alkaline on VBAT and use the wide 1.6-3.6 V supply; in a 1% duty-cycle wake profile the average draw drops below 5 uA, vastly extending battery service intervals.
Recommended
Smart Metering and Energy Harvesting
ATSAML22N16A-CFUT drives smart meters that combine Segment LCD readout, capacitive-touch button input, and battery or harvested energy supply. The integrated Segment LCD controller (up to 8 COM x 25 SEG) eliminates external LCD driver ICs, while the integrated PTC handles touch pads directly. At a 1.6 V supply input, harvested energy from thermal or RF sources can power the meter through the on-chip LDO and brown-out detector; together with low-power RTC and tamper-detect pin, the SAM L22 serves sealed utility-meter enclosures for >10 years.
Recommended
Wearable Health and Fitness Devices
ATSAML22N16A-CFUT suits wearable health devices because of its low active current and small 100-UFBGA footprint. The 12-bit ADC captures photoplethysmography and skin-electrode signals while 82 I/O lines support multiple sensor channels (heart-rate, SpO2, motion). For BLE companion radios, the SAM L22 wakes the host MCU only at sample events using I2C, leaving the Cortex-M0+ idle for most of the duty cycle. With USB-charged batteries and integrated touch, the part enables fitness-band designs with a single MCU plus wireless chip.
Recommended
Capacitive Touch Human-Machine Interfaces
ATSAML22N16A-CFUT is ideal for HMI panels thanks to the on-chip Peripheral Touch Controller (PTC). The PTC supports self- and mutual-capacitance scanning across dozens of buttons or slider/wheel elements without CPU intervention, and SleepWalking lets the touch subsystem interrupt the CPU only on a real touch event. The high I/O count (82) supports separate LED indicator drivers, while the Segment LCD controller can drive status displays on the same board. Designers can therefore shrink BOM cost and PCB area versus discrete touch ASICs.
Recommended
Industrial Sensor and Control Modules
ATSAML22N16A-CFUT fits rugged industrial sensor modules because of the -40 C to +85 C operating range, on-chip 12-bit ADC and DAC, and SERCOM channels supporting RS-485, SPI, or I2C. The 32 MHz Cortex-M0+ delivers real-time loop times that close PID control, while full-speed USB device enables local configuration via USB-CDC without an extra chip. The internal BOD, watchdog, and brown-out reset support IEC 61508 safety considerations when combined with proper firmware supervision.
Recommended
Consumer Electronics with Segment LCD
ATSAML22N16A-CFUT is well-suited to consumer products with Segment LCD displays such as kitchen scales, kitchen timers, blood-pressure monitors, and audio mixers. The integrated Segment LCD controller drives up to 8 common x 25 segment outputs directly, eliminating external LCD drivers; ultra-low backup current keeps the LCD running from a coin cell without draining it for years. The 32-bit ARM core and 64 KB Flash also support capacitive-touch slide for value entry and small audio codecs on SERCOM for haptic feedback.
Recommended
Recommended Products Summary
Engineering reference data for ATSAML22N16A-CFUT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAML22N16A-AUT | ATSAML22J16A-MUT | ATSAML22G16A-MUT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 100-UFBGA (6x6 mm) | 64-TQFP (different footprint) | 100-UFBGA - same footprint | 100-UFBGA - same footprint |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Clock Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Supply Voltage Range | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V |
| USB Device | Yes (full-speed) | Yes (full-speed) | Yes (full-speed) | No |
| Segment LCD Controller | Yes (8 COM x 25 SEG) | Yes | Yes | Yes |
| Capacitive Touch (PTC) | Yes | Yes | Yes | Yes |
Key Differentiators
- Integrated Segment LCD controller plus USB plus PTC (vs ATSAML22G16A-MUT)
- Lowest backup-mode current with RTC in the SAM L22 family (vs ATSAML11D16A-YU)
- 100-UFBGA footprint variant ordering availability (vs ATSAML22N16A-AUT (64-TQFP))
Design Notes
Estimated average current for battery sizing: with active-mode duty cycle D and active current Iactive = 39 uA/MHz x 32 MHz, plus sleep current Isleep approximated by backup mode 490 nA, the average draw is (D x Iactive) + ((1-D) x Isleep). At a typical 1 percent duty cycle the average draw is approximately 12 uA, and a 220 mAh CR2032 will last roughly 18 months. Use Microchip's Data Visualizer and Atmel Start power profiler to validate your specific cycle.
Place bypass capacitors (100 nF and 1 uF) as close as possible to each VDDCORE and VDDIO ball, on the top layer using short traces or vias directly to the ground pad. Route the USB D+/D- differential pair with 90 ohm controlled impedance, length matching within 150 mil, and keep the pair away from high-frequency switching traces. The 100-UFBGA 6 x 6 mm package requires via-in-pad or dog-bone fan-out depending on stackup - consult the SAM L22 hardware-design guide.
Common pitfalls when migrating from SAM D or SAM E families: do NOT default to 3.3 V MCLR or external reset, the SAM L22 uses the SWD interface only. Do NOT exceed VDDIO 3.6 V absolute max - the SAM L22 is NOT a 5 V tolerant device. Do NOT disable the PTC clock before clearing pending interrupt flags; the touch controller can lock out if its clock is stopped while a scan is active. Do NOT rely solely on the internal 32 kHz oscillator if USB operation is needed - use an external crystal.
Compliance Information
RoHS and lead-free confirmed via Microchip material declaration. AEC-Q100 not qualified - choose ATSAML22N18A-AUT automotive or ATSAMC20N18A-AUT for vehicular variants.
