ATSAMD11C14A-SSUT - 32-bit ARM Cortex-M0+ MCU 48MHz 16KB Flash | Microchip
MPN: ATSAMD11C14A-SSUT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.27 | $227.00 |
| 500 | $2.04 | $1,020.00 |
| 1,000 | $1.8 | $1,800.00 |
ATSAMD11C14A-SSUT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (flash), data memory (SRAM), and a rich set of peripheral interfaces. The Cortex-M0+ is the smallest, most energy-efficient ARM core designed for embedded applications, sitting at the bottom of the Cortex-M hierarchy (Cortex-M0/M0+ -> Cortex-M3 -> Cortex-M4 -> Cortex-M7). The SAM D11C series specifically adds native USB 2.0 full-speed and an integrated 48 MHz digital frequency-locked loop (DFLL) on-chip oscillator, which removes the need for an external crystal in USB applications.
Key differentiating features include 16 KB flash with read-while-write support, 4 KB SRAM, up to 12 SERCOM pads that can each be configured as USART, I2C, or SPI, a 12-bit 350 ksps ADC with up to 10 channels, a 10-bit 350 ksps DAC, two analog comparators, two I2S interfaces, and a real-time clock. The device operates from 1.62 V to 3.63 V and is qualified for -40 C to +85 C industrial temperature range.
The ATSAMD11C14A-SSUT's architecture uses a two-bus AHB-Lite matrix with a separate APB bridge, allowing DMA-driven SERCOM, ADC, and DAC operations to occur in parallel with CPU execution. The on-chip DFLL48M locks to the 32.768 kHz crystal reference to derive the 48 MHz USB clock, eliminating the BOM cost of a high-frequency external crystal. The peripheral event system and 6-channel DMA controller further reduce CPU overhead in real-time applications.
Typical applications include USB HID peripherals (keyboards, mice, custom input devices), home automation sensor nodes, low-power wireless gateways with USB charging interfaces, consumer toys and wearables with USB-C connectivity, industrial meter reading equipment, and small motor-control daughterboards. The combination of native USB, small footprint, and Cortex-M0+ ecosystem support makes it well suited to volume-cost-sensitive designs that still need modern connectivity.
When designing with this part, plan the PCB layout to keep the USB DP/DM traces length-matched within 4 mm and the 32.768 kHz crystal traces short and guarded. Decouple VDD with at least one 100 nF X7R capacitor placed within 2 mm of the pin, and add a 4.7 uF bulk capacitor for the USB VBUS rail. Program the DFLL before USB enumeration to meet USB 2.0 full-speed jitter specifications.
This page consolidates distributor stock, AEC-Q100 sibling variants, and practical design notes not found in the manufacturer datasheet to accelerate your component selection and PCB bring-up.
Drop-in alternatives for ATSAMD11C14A-SSUT — 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 ATSAMD11C14A-SSUT (same form factor and footprint) — differing in ADC, Package, USB, Mounting Type, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD11C14A-SSNT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.2 / Unit
View Datasheet →ATSAMD11D14A-SSNT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$0.99 / Unit
View Datasheet →ATSAMD11C14A-MUT
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATSAMD11C14A-SSUT Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M0+ |
| Core Size | 32-Bit |
| Maximum Clock Speed | 48 MHz |
| Program Memory Size | 16 KB (16K x 8) FLASH |
| RAM Size | 4 KB |
| Supply Voltage Range | 1.62 V to 3.63 V |
| Operating Temperature Range | -40 C to +85 C |
| Package | 14-SOIC (SS) 3.90 mm |
| Number of I/O Pins | 12 |
| ADC | 12-bit, 10 channels, up to 350 ksps |
| DAC | 10-bit, 1 channel, 350 ksps |
| USB | USB 2.0 Full-Speed Device |
| Communication Interfaces | I2C, SPI, UART/USART, USB, I2S |
| Connectivity | I2C, SPI, UART, USB |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
| Series | SAM D11C |
ATSAMD11C14A-SSUT Pin Configuration
| Pin 1 | PA02 — GPIO / ADC AIN[0] |
| Pin 2 | PA03 — GPIO / ADC AIN[1] / DAC VOUT |
| Pin 3 | PA04 — GPIO / VBUS sense |
| Pin 4 | GND — Ground |
| Pin 5 | VDD — Digital supply voltage (1.62V - 3.63V) |
| Pin 6 | PA05 — GPIO / ADC AIN[5] |
| Pin 7 | PA06 — GPIO / ADC AIN[6] / SERCOM0 |
| Pin 8 | PA07 — GPIO / SERCOM0 / I2S |
| Pin 9 | PA09 — GPIO / USB DP |
| Pin 10 | PA10 — GPIO / USB DM |
| Pin 11 | PA14 — GPIO / SERCOM2 / SWD clock (SWCLK) |
| Pin 12 | PA15 — GPIO / SERCOM2 / SWD data (SWDIO) |
| Pin 13 | PA16 — GPIO / SERCOM1 / I2S |
| Pin 14 | PA17 — GPIO / SERCOM1 / XIN32 (32.768 kHz crystal in) |
Typical Applications
ATSAMD11C14A-SSUT is suitable for 6 applications: USB HID Peripheral Devices, Home Automation Sensor Nodes, USB Charging-Status Indicators, Consumer Toys and Wearables, Industrial Meter Reading Equipment, Small Motor Control Daughterboards.
USB HID Peripheral Devices
The ATSAMD11C14A-SSUT is well suited to USB Human Interface Device (HID) peripherals such as keyboards, mice, custom HID input devices, and game controllers because its integrated USB 2.0 Full-Speed Device controller eliminates the need for an external USB-to-UART bridge IC. The 16 KB flash comfortably holds HID report descriptors, debounce logic, and CAPS-LOCK/NUMPAD class firmware; the 4 KB SRAM handles HID report buffers and protocol state. The on-chip DFLL48M locks to a 32.768 kHz crystal and provides the 48 MHz USB clock, removing the USD 0.30 external high-frequency crystal. Designers can free additional pins by using the 6-channel DMA to drive USB endpoints without CPU intervention.
Recommended
Home Automation Sensor Nodes
The ATSAMD11C14A-SSUT is appropriate for low-cost home automation sensor nodes (temperature, humidity, contact, motion) that communicate via I2C sensor hubs or simple UART radios. Its 12-bit 350 ksps ADC provides enough resolution for thermistor/photodiode/PIR signal chains, while the 6 SERCOM pads can each be configured as I2C, SPI, or UART, allowing flexible sensor fan-out without an I/O expander. The sub-5 uA STANDBY current with RTC running enables multi-year battery life on 2x AA cells; the Cortex-M0+ wakes in <10 us on RTC compare to take a measurement and transmit. The 14-SOIC package allows hand-solderable prototypes and reduces assembly cost for low-volume SKUs.
Recommended
USB Charging-Status Indicators
The ATSAMD11C14A-SSUT can serve as a USB-C charging-status indicator MCU that drives LEDs based on VBUS voltage, USB PD negotiation result, or battery telemetry from an external fuel gauge. Its 10-bit DAC and PWM channels generate smooth LED fade animations while the USB device stack reports charging current over I2C to a host. The 12-bit ADC monitors VBUS and battery voltage with 1 mV resolution, sufficient for accurate charge-state indication. The 14-SOIC fits behind a USB-C connector in a 25x30 mm enclosure with no additional components beyond a regulator and passives.
Recommended
Consumer Toys and Wearables
The ATSAMD11C14A-SSUT is a strong fit for consumer toys and entry-level wearables where small footprint, low power, and USB charging support are critical. The 14-SOIC is small enough for wearable wristbands and toy controllers while remaining hand-solderable. The Cortex-M0+ runs at <50 uA/MHz active, supporting all-day battery life on 80 mAh Li-Po; the 12-bit ADC handles heart-rate sensor analog front-ends, and the 10-bit DAC drives audio prompts or haptic feedback waveforms. USB device mode enables firmware updates and battery charging through a single USB-C connector.
Recommended
Industrial Meter Reading Equipment
The ATSAMD11C14A-SSUT is appropriate for industrial meter reading peripherals (gas, water, electric meter AMR add-ons, handheld reader probes) that need USB connectivity for data export and a robust industrial temperature range. The -40 C to +85 C operating range and integrated 12-bit ADC measure sensor signals to within 0.1% accuracy; the SERCOM-configurable I2C/SPI interfaces connect to modern metering ICs and EEPROMs. The Cortex-M0+ executes meter protocol stacks (DLMS/COSEM, Modbus RTU) at 48 MHz with deterministic interrupt latency. USB device mode enables handheld reader probes to dump logged data to a laptop without additional bridge ICs.
Recommended
Small Motor Control Daughterboards
The ATSAMD11C14A-SSUT can drive small motor-control daughterboards for fans, pumps, and miniature BLDC motors where its 48 MHz Cortex-M0+ runs simple 6-step or FOC commutation algorithms and its PWM channels drive gate drivers. The 10-bit DAC generates reference waveforms for closed-loop current control, and the on-chip analog comparators provide hardware overcurrent protection with <100 ns response time. The 12-bit ADC samples back-EMF at 350 ksps, sufficient for slow-speed BLDC commutation up to 10,000 RPM. The 14-SOIC footprint mounts on small stepper motor carrier boards.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD11C14A-SSUT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD11C14A-SSNT | ATSAMD11D14A-SSNT | ATSAMD11C14A-MUT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 14-SOIC (SS) 3.90 mm | 20-SOIC (SN) - same SOIC family, larger | 20-SOIC (SN) - same SOIC family, larger | QFN-32 (M) 5x5 mm - different package |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Max Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash | 16 KB | 16 KB | 32 KB (+100%) | 16 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB |
| I/O Pins | 12 | 18 (+50%) | 18 (+50%) | Up to 24 (+100%) |
| USB | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device |
Key Differentiators
- Smallest SAM D11C package with native USB (vs ATSAMD11C14A-SSNT)
- Higher flash option within same pinout family (vs ATSAMD11D14A-SSNT)
- QFN package option for space-constrained designs (vs ATSAMD11C14A-MUT)
Design Notes
Place the 100 nF VDD decoupling capacitor within 2 mm of pin 5 with a direct via to the ground plane. Add a 4.7 uF bulk capacitor on VBUS to meet USB inrush current requirements per USB 2.0 spec section 7.2.4. Keep the 32.768 kHz crystal traces (PA17/PA18 in larger packages) shorter than 5 mm and surround them with a ground guard ring to minimize jitter on the DFLL48M-derived 48 MHz USB clock.
The USB DP and DM traces (PA09/PA10) must be length-matched within 4 mm and routed over a continuous ground plane with 33 ohm series resistors placed within 6 mm of the MCU pins. Maintain 90 ohm differential impedance if USB 2.0 high-speed certification is ever required (this part is Full-Speed only). Avoid routing digital signals (SERCOM, PWM) across the DP/DM pair to prevent coupling into the eye pattern.
Do not skip the NVM software row configuration - the ATSAMD11C14A-SSUT requires specific fuse settings to enable the USB clock source and lock bits. Program the DFLL48M calibration after every cold boot to meet USB 2.0 full-speed jitter (within +/- 2.5% of nominal). Do not assume the bootloader is present - the standard -SSUT variant has NO factory bootloader; order -SU variant or use SWD to program firmware.
Compliance Information
RoHS compliant per Microchip product page; lead-free finish (Matte Tin). Industrial temperature grade -40C to +85C. No AEC-Q100 automotive qualification - for automotive applications use SAM D11C variants with -AUT suffix.
