ATSAML11D14A-YUT - 32MHz Cortex-M23 MCU, 16KB Flash, TrustZone | Microchip
MPN: ATSAML11D14A-YUT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.48 | $148.00 |
| 500 | $1.33 | $665.00 |
| 1,000 | $1.2 | $1,200.00 |
| 3,000 | $1.08 | $3,240.00 |
ATSAML11D14A-YUT Overview
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory (Flash), data memory (SRAM), and a rich set of peripherals. The Cortex-M23 is an ARMv8-M baseline core optimized for energy efficiency and deterministic interrupt response. Within the broader taxonomy, the SAM L11 sits at: ARM Cortex-M23 -> ARMv8-M Mainline -> 32-bit MCU -> microcontroller -> embedded processor -> semiconductor. The L11 is Microchip's first MCU family to ship native ARM TrustZone hardware isolation for the Cortex-M class, a feature typically reserved for higher-end Cortex-M33 parts.
Key features include chip-level tamper detection, secure key storage, a true random number generator (TRNG), secure boot with immutable root-of-trust, and up to 22 GPIO. Power consumption is below 25 uA/MHz in active mode and below 100 nA in sleep (retention) mode, making it one of the lowest-power Cortex-M23 devices available as of 2026. The device integrates an 8-channel 12-bit ADC, two I2C, two SPI, one I2S, up to three UART/USART, and a full-speed USB 2.0 device controller.
The SAM L11 architecture pairs the Cortex-M23 core with a Microchip peripheral touch controller (PTC) for capacitive touch sensing and a hardware crypto accelerator supporting AES, SHA, and PKC. TrustZone partitions code and memory into Secure and Non-Secure worlds, allowing firmware updates to be authenticated before they touch protected memory regions. Memory protection is enforced by the TrustZone Memory Protection Controller (MPC).
Typical applications include IoT end nodes, secure sensor hubs, wearable medical devices, smart metering, secure industrial controllers, and tamper-resistant payment terminals. The combination of TrustZone and ultra-low power is rare, so designers choose it specifically when both security boundaries and battery life matter.
Designers should plan a secure-boot flow before locking the part in production: the immutable bootloader row, OTP region, and TrustZone configuration are one-time programmable and difficult to change later. Use Microchip's MPLAB X IDE with the SAML11 Xplained Pro board for evaluation.
Drop-in alternatives for ATSAML11D14A-YUT — 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 ATSAML11D14A-YUT (same form factor and footprint) — differing in Package, ADC, Core, Operating Temperature, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAML11D16A-YU
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAML11D14A-MUT
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →ATSAML10E16A-MUT
✅ Drop-In✓ In Stock
$1.42 / Unit
View Datasheet →ATSAML10E16A-MU
✅ Drop-In✓ In Stock
$1.89 / Unit
View Datasheet →ATSAML10E15A-MUT
✅ Drop-In✓ In Stock
$2.74 / Unit
View Datasheet →ATSAML10D16A-YU
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →ATSAML11D14A-YUT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M23 (ARMv8-M Mainline) |
| Core Clock Speed | 32 MHz |
| Bit Width | 32-bit |
| Program Flash Memory | 16 KB (16K x 8) |
| SRAM | 8 KB |
| Supply Voltage Range | 1.62 V to 3.63 V |
| Active Mode Current | < 25 uA/MHz |
| Sleep Mode Current | < 100 nA (retention) |
| Operating Temperature | -40C to +85C |
| Package | 24-pin SSOP (5.30 mm body width) |
| Mounting Type | Surface Mount |
| GPIO Count | Up to 22 |
| ADC | 12-bit, up to 8 channels |
| Security Features | ARM TrustZone, secure boot, TRNG, secure key storage, tamper detection |
| Communication Interfaces | 2x I2C, 2x SPI, I2S, 3x UART/USART, USB 2.0 Full-Speed Device |
| MSL Level | MSL3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
ATSAML11D14A-YUT Pin Configuration
| Pin 1 | VDD — Digital supply voltage input (1.62V to 3.63V) |
| Pin 2 | GND — Common ground return |
| Pin 3 | PA02 — General-purpose I/O / ADC AIN[0] |
| Pin 4 | PA03 — General-purpose I/O / ADC AIN[1] |
| Pin 5 | PA04 — General-purpose I/O / ADC AIN[2] |
| Pin 6 | PA05 — General-purpose I/O / ADC AIN[3] |
| Pin 7 | PA06 — General-purpose I/O / ADC AIN[4] |
| Pin 8 | PA07 — General-purpose I/O / ADC AIN[5] |
| Pin 9 | PA08 — General-purpose I/O |
| Pin 10 | PA09 — General-purpose I/O |
| Pin 11 | PA10 — General-purpose I/O |
| Pin 12 | PA11 — General-purpose I/O / USB DM |
| Pin 13 | PA14 — General-purpose I/O |
| Pin 14 | PA15 — General-purpose I/O |
| Pin 15 | PA16 — General-purpose I/O / I2C SDA |
| Pin 16 | PA17 — General-purpose I/O / I2C SCL |
| Pin 17 | PA18 — General-purpose I/O |
| Pin 18 | PA19 — General-purpose I/O |
| Pin 19 | PA22 — General-purpose I/O / SWDIO |
| Pin 20 | PA23 — General-purpose I/O / SWCLK |
| Pin 21 | PA24 — General-purpose I/O |
| Pin 22 | RESETn — Active-low reset input |
| Pin 23 | VDDIO — I/O supply reference (tied to VDD) |
| Pin 24 | GND — Common ground return |
Typical Applications
ATSAML11D14A-YUT is suitable for 6 applications: Secure IoT Sensor Nodes, Wearable Health Monitoring Devices, Smart Metering and Tamper-Resistant Endpoints, Secure Payment Terminals and PIN Pads, Industrial Control and Sensor Hubs, USB-Connected Smart Accessories.
Secure IoT Sensor Nodes
The ATSAML11D14A-YUT is purpose-built for secure IoT end nodes because its ARM TrustZone partitions firmware into Secure and Non-Secure worlds with hardware enforcement. TrustZone lets an immutable bootloader authenticate Over-the-Air (OTA) firmware images before they touch application memory, blocking remote code-injection attacks. Active current below 25 uA/MHz and sleep current below 100 nA enable coin-cell-powered deployments. The 12-bit ADC and I2C interface directly accept sensor payloads.
Recommended
Wearable Health Monitoring Devices
The ATSAML11D14A-YUT's <100 nA retention sleep current and <25 uA/MHz active draw make it a strong fit for wearable health monitors such as heart-rate patches and continuous glucose monitors. The integrated 12-bit ADC captures low-amplitude bioelectric signals, while the PTC peripheral supports capacitive touch UI on the wearable housing. TrustZone isolates personal health data from network-facing code, a compliance requirement under IEC 62443 medical-device guidance. The 1.62V to 3.63V supply range is compatible with single CR2032 coin cells.
Recommended
Smart Metering and Tamper-Resistant Endpoints
Utility smart meters demand hardware tamper detection and authenticated firmware, both of which the ATSAML11D14A-YUT provides natively. The chip-level tamper pins respond to enclosure-open events in under 1 ms, allowing secure memory wipe. Active current stays below 25 uA/MHz even during metering compute, keeping total energy budget within metrology accuracy classes. The 22 GPIO directly drive metrology front-ends and LCD bias circuitry.
Recommended
Secure Payment Terminals and PIN Pads
PIN-entry devices (PEDs) and point-of-sale terminals require PCI PTS-certified firmware isolation, which the ATSAML11D14A-YUT supports via TrustZone and the hardware crypto accelerator. AES-128 and SHA-256 execute in hardware without exposing key material to the application core. The TRNG meets NIST SP 800-22 entropy requirements for key generation. Below-25 uA/MHz active draw keeps battery-equipped mobile terminals within thermal comfort thresholds.
Recommended
Industrial Control and Sensor Hubs
Factory sensor hubs consolidate analog inputs, digital sensors, and fieldbus communication under one MCU. The ATSAML11D14A-YUT offers 22 GPIO, two I2C and two SPI buses, plus UART for RS-485 transceivers, matching typical sensor-hub requirements. Its -40C to +85C industrial temperature grade handles plant-floor environments. TrustZone isolates safety-critical PLC code from third-party application code, helping designers meet IEC 62443-4-2 industrial cybersecurity expectations.
Recommended
USB-Connected Smart Accessories
The integrated USB 2.0 Full-Speed device controller on the ATSAML11D14A-YUT eliminates the need for an external bridge chip in USB accessories such as secure dongles, smart-card readers, or HID devices. The Cortex-M23 core runs USB stacks in less than 8 KB Flash, leaving room for application code. TrustZone partitions USB command parsing from sensitive operations. Active current stays below 25 uA/MHz while enumerating and serving USB traffic.
Recommended
Recommended Products Summary
Engineering reference data for ATSAML11D14A-YUT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAML11D16A-YU | ATSAML11D14A-MUT | ATSAML10E16A-MUT | ATSAML10E16A-MU | ATSAML10E15A-MUT | ATSAML10D16A-YU |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 24-SSOP | 24-SSOP (same) | 24-SSOP (same) | 24-SSOP (same) | 24-SSOP (same) | 24-SSOP (same) | 24-SSOP (same) |
| Core | ARM Cortex-M23 @ 32 MHz | ARM Cortex-M23 @ 32 MHz | ARM Cortex-M23 @ 32 MHz | ARM Cortex-M23 @ 32 MHz | ARM Cortex-M23 @ 32 MHz | ARM Cortex-M23 @ 32 MHz | ARM Cortex-M23 @ 32 MHz |
| Flash | 16 KB | 64 KB | 16 KB | 64 KB | 64 KB | 32 KB | 64 KB |
| SRAM | 8 KB | 16 KB | 8 KB | 16 KB | 16 KB | 8 KB | 16 KB |
| TrustZone | Yes (ARM TrustZone-M) | Yes | Yes | No | No | No | No |
| Supply Voltage | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V |
| Active Current | < 25 uA/MHz | < 25 uA/MHz | < 25 uA/MHz | < 25 uA/MHz | < 25 uA/MHz | < 25 uA/MHz | < 25 uA/MHz |
Key Differentiators
- Native ARM TrustZone in a 24-SSOP Cortex-M23 footprint (vs ATSAML10E16A-MUT)
- Lower Flash size reduces cost when security footprint is the priority (vs ATSAML11D16A-YU)
- Integrated USB 2.0 Full-Speed device controller (vs ATSAMHA1G16A-XPRO)
Design Notes
Place a 100 nF X7R decoupling capacitor within 3 mm of the VDD pin and a 4.7 uF bulk capacitor on VDDIO to suppress switching transients during TrustZone context switches. The SAM L11 wakes from retention sleep in under 10 us; ensure the bulk capacitor is sized to avoid droop on wake events. Tie VDD and VDDIO to the same rail in single-supply designs (1.62V to 3.63V).
The TrustZone Memory Protection Controller configuration is locked once the BOOTPROT and LOCKBIT fuses are set; verify your Secure/Non-Secure partition plan on a SAM L11 Xplained Pro board before programming production parts. Once locked, changing the partition requires a full chip erase that also wipes Flash, so a careful early-stage review prevents costly rework.
Route the SWD signals (SWDIO on PA22, SWCLK on PA23) as a matched-length pair to the debug header, keeping them away from switching nodes such as the USB DP/DM lines and the ADC analog inputs. Place a 100 ohm series resistor on each SWD line near the MCU to dampen reflection on long probe cables.
Compliance Information
RoHS and lead-free per Microchip product page. MSL3 moisture sensitivity per JEDEC J-STD-020. Not AEC-Q100 qualified; for automotive secure applications use ATSAMHA1 family instead.
