ATSAML11D15A-YUT - ARM Cortex-M23 MCU 32KB Flash TrustZone | Microchip
MPN: ATSAML11D15A-YUT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.82 | $2.82 |
| 10 | $2.54 | $25.40 |
| 100 | $2.25 | $225.00 |
| 500 | $2.01 | $1,005.00 |
| 1,000 | $1.78 | $1,780.00 |
| 3,000 | $1.55 | $4,650.00 |
ATSAML11D15A-YUT Overview
A microcontroller (MCU) is an integrated circuit that combines a processor core, program memory (Flash), data memory (RAM), and programmable peripherals on a single chip. Within the semiconductor hierarchy, microcontrollers belong to embedded processors, which sit under logic ICs and integrated circuits. The Cortex-M23 specifically is an ARMv8-M Baseline core designed for energy-constrained secure applications, sitting below Cortex-M3/M4/M7 in performance but adding TrustZone for ARM hardware-level isolation between secure and non-secure code regions.
Key features include 32KB Flash with secure boot support, 8KB SRAM, ARM TrustZone-M technology, hardware AES accelerator, True Random Number Generator (TRNG), secure key storage, up to 32MHz operation, and a wide operating voltage range of 1.62V to 3.63V supporting both 1.8V and 3.3V system rails. The peripheral set includes multiple SERCOM (serial communication) interfaces, a 12-bit ADC, timers, and an RTC, providing flexibility for sensor and IoT nodes.
The ATSAML11D15A-YUT is built on a low-leakage process and integrates a sophisticated power management unit with multiple sleep modes (Idle, Standby, Backup, and Off). The TrustZone isolation enables IP protection and secure firmware updates, critical for IoT endpoint devices vulnerable to physical and remote attacks. Cryptographic accelerators offload AES, SHA, and TRNG operations from the Cortex-M23 core, reducing active current and improving throughput.
Typical applications include IoT end nodes with secure cloud connectivity, smart sensors requiring firmware authentication, building automation controllers, asset tracking devices, medical wearables with HIPAA-grade data protection, and industrial sensor hubs operating from coin-cell or energy-harvesting power sources. The combination of TrustZone and ultra-low sleep current uniquely targets battery-powered secure endpoints.
When designing with this MCU, ensure the TrustZone configuration is finalized before production. The secure attribution unit (SAU) and implementation-defined attribution unit (IDAU) require careful setup to prevent security violations. Decoupling capacitors must be placed close to VDD pins per the manufacturer layout guidelines.
This page synthesizes distributor pricing, drop-in alternatives from the same SAM L11 family, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for ATSAML11D15A-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 ATSAML11D15A-YUT (same form factor and footprint) — differing in ADC, Core Architecture, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAML11D14A-YUT
✅ Drop-In✓ In Stock
$1.08 / Unit
View Datasheet →ATSAML11D15A-YUT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M23 |
| Core Bit Width | 32-bit |
| Maximum Clock Frequency | 32 MHz |
| Program Memory (Flash) | 32 KB (32K x 8) |
| RAM | 8 KB SRAM |
| TrustZone Technology | ARM TrustZone-M (hardware isolation) |
| Operating Voltage Range | 1.62 V to 3.63 V |
| Active Current | < 25 µA/MHz |
| Sleep Current | < 100 nA |
| Operating Temperature Range | -40°C to +85°C (industrial) |
| Package | 24-SSOP (0.209", 5.30mm Width) |
| Mounting Type | Surface Mount |
| AES Hardware Accelerator | Yes |
| True Random Number Generator (TRNG) | Yes |
| Secure Key Storage | Yes |
| ADC | 12-bit |
| SERCOM (Configurable Serial) | Yes (multiple) |
| RoHS Status | Compliant |
ATSAML11D15A-YUT Pin Configuration
| Pin 1 | VDD — Power supply input (1.62V-3.63V) |
| Pin 2 | PA00 — GPIO / SERCOM0 pad |
| Pin 3 | PA01 — GPIO / SERCOM0 pad |
| Pin 4 | PA02 — GPIO / SERCOM0 pad / ADC |
| Pin 5 | PA03 — GPIO / SERCOM0 pad / ADC reference |
| Pin 6 | PA04 — GPIO / SERCOM1 pad |
| Pin 7 | PA05 — GPIO / SERCOM1 pad |
| Pin 8 | PA06 — GPIO / SERCOM1 pad |
| Pin 9 | PA07 — GPIO / SERCOM1 pad |
| Pin 10 | PA08 — GPIO / SERCOM2 pad |
| Pin 11 | PA09 — GPIO / SERCOM2 pad |
| Pin 12 | GND — Ground reference |
| Pin 13 | PA10 — GPIO / SERCOM2 pad |
| Pin 14 | PA11 — GPIO / SERCOM2 pad |
| Pin 15 | PA14 — GPIO / SERCOM3 pad |
| Pin 16 | PA15 — GPIO / SERCOM3 pad |
| Pin 17 | PA16 — GPIO / SERCOM3 pad |
| Pin 18 | PA17 — GPIO / SERCOM3 pad |
| Pin 19 | PA22 — GPIO / SERCOM4 pad |
| Pin 20 | PA23 — GPIO / SERCOM4 pad |
| Pin 21 | PA24 — GPIO / SERCOM4 pad |
| Pin 22 | RESET — Reset input (active low) |
| Pin 23 | GND — Ground reference |
| Pin 24 | VDD — Power supply input (1.62V-3.63V) |
Typical Applications
ATSAML11D15A-YUT is suitable for 6 applications: IoT End Nodes with Secure Cloud Connectivity, Smart Building Automation Controllers, Wearable Medical Devices with HIPAA-Grade Security, Industrial Sensor Hubs and Edge Gateways, Battery-Powered Asset Tracking Devices, Smart Card and Secure Access Controllers.
IoT End Nodes with Secure Cloud Connectivity
The ATSAML11D15A-YUT is purpose-built for IoT end nodes requiring hardware-isolated security between application code and credential material. Its ARM TrustZone-M technology partitions the Cortex-M23 core into secure and non-secure domains, allowing Wi-Fi/BLE stack firmware to run in the non-secure world while TLS private keys, certificates, and OTA signing keys remain isolated in secure storage. The <100nA sleep current enables multi-year coin-cell operation for asset trackers and remote sensors reporting via LoRaWAN or MQTT, while the 32MHz Cortex-M23 supports TLS 1.2/1.3 handshakes with the hardware AES accelerator offloading encryption. The 1.62V–3.63V operating range accepts the sagging voltage of depleted primary batteries without requiring a boost converter.
Recommended
Smart Building Automation Controllers
Building automation systems require MCUs that balance always-on sensing with cryptographic security for BACnet, KNX, or proprietary mesh protocols. The ATSAML11D15A-YUT's 12-bit ADC reads temperature, humidity, and occupancy sensors while its multiple SERCOM interfaces connect to RS-485 transceivers for wired building networks. The hardware TRNG generates fresh session keys for each commissioning transaction, preventing replay attacks during initial device onboarding. At <25µA/MHz, the MCU can sustain continuous sensor sampling on Energy Harvesting (EH) or PoE-derived rails without exhausting backup supercapacitors during brownout events spanning minutes.
Recommended
Wearable Medical Devices with HIPAA-Grade Security
Wearable medical devices such as continuous glucose monitors (CGMs), pulse oximeters, and ECG patches require both compact packaging and tamper-resistant firmware to satisfy FDA cybersecurity guidance and HIPAA data-protection requirements. The ATSAML11D15A-YUT's chip-level tamper resistance detects voltage glitching and physical probing attempts, while secure key storage ensures patient health data cannot be extracted even with direct flash access. The 24-SSOP package fits inside wristbands and chest patches, and the <100nA sleep current extends battery life to weeks between charges. The 12-bit ADC captures biosensor signals with sufficient resolution for clinical-grade SpO2 and heart-rate measurements.
Recommended
Industrial Sensor Hubs and Edge Gateways
Industrial sensor hubs aggregate data from multiple field sensors and forward it to SCADA or cloud systems via industrial Ethernet or cellular. The ATSAML11D15A-YUT serves as a secure edge aggregator, with TrustZone isolating the Modbus/Profibus parsing firmware from the TLS-secured uplink stack. Its multiple SERCOMs handle RS-485, SPI, and I2C sensor interfaces simultaneously, while the hardware AES engine encrypts telemetry before transmission without burdening the Cortex-M23 core. The -40°C to +85°C industrial temperature range supports deployment in factory cabinets and outdoor enclosures, where ambient temperatures routinely swing across extreme ranges during seasonal cycles.
Recommended
Battery-Powered Asset Tracking Devices
Asset tracking devices attached to pallets, shipping containers, or rental equipment require multi-year battery life combined with cryptographic authentication to prevent location spoofing. The ATSAML11D15A-YUT's <100nA sleep current allows the MCU to wake only when motion is detected or on a periodic heartbeat schedule, preserving primary lithium-thionyl chloride cells rated for 10+ years. TrustZone isolates the GPS coordinate signing key from application firmware, preventing counterfeit location injection. The 32KB Flash accommodates BLE stack plus custom tracking firmware, while the 8KB SRAM buffers cached sensor data during offline periods when cellular coverage is unavailable.
Recommended
Smart Card and Secure Access Controllers
The ATSAML11D15A-YUT is well-suited for secure access controllers in physical security systems including door readers, elevator floor locks, and electronic safe controllers. Its ARM TrustZone-M enables secure storage of cryptographic door credentials separate from the user-facing keypad/display firmware, while the hardware AES engine accelerates challenge-response authentication against RFID/NFC readers in under 50ms. The chip-level tamper resistance detects physical intrusion attempts on the reader housing, triggering secure erase of all key material. The 1.62V to 3.63V operating range accepts power directly from the 3.3V regulator fed by PoE or 24VAC door access transformers.
Recommended
Recommended Products Summary
Engineering reference data for ATSAML11D15A-YUT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAML11D14A-YUT | ATSAML11D15A-MU |
|---|---|---|---|
| Package | 24-SSOP | 24-SSOP (same) | QFN (different package, not pin-compatible) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M23 32MHz | ARM Cortex-M23 32MHz | ARM Cortex-M23 32MHz |
| Flash | 32 KB | 16 KB (-50%) | 32 KB (same) |
| SRAM | 8 KB | 8 KB (same) | 8 KB (same) |
| TrustZone-M | Yes | Yes | Yes |
| Operating Voltage | 1.62V to 3.63V | 1.62V to 3.63V | 1.62V to 3.63V |
| Active Current | <25 µA/MHz | <25 µA/MHz | <25 µA/MHz |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
Key Differentiators
- Industry-first ARM TrustZone-M at chip level (vs ATSAML10E16A-MUT (SAM L10, no TrustZone))
- Ultra-low 100nA sleep current (vs Generic Cortex-M0+ MCUs)
- Hardware cryptographic accelerators (vs Software-based AES implementations)
Design Notes
The ATSAML11D15A-YUT operates from 1.62V to 3.63V supporting both 1.8V and 3.3V rails. Place a 1µF X7R decoupling capacitor within 2mm of each VDD pin (pins 1 and 24) and a 100nF capacitor in parallel for high-frequency noise. Add a 10µF bulk capacitor near the package to handle transient current during SERCOM activity. For battery operation, route both GND pins (12 and 23) to a low-impedance ground plane to prevent ground bounce during ADC conversions.
When using ARM TrustZone-M, ensure the Secure Attribution Unit (SAU) and Implementation-Defined Attribution Unit (IDAU) are configured before enabling any interrupts in the non-secure world. Incorrect SAU setup can lock out debug access or cause hard faults that are difficult to diagnose post-production. Always test TrustZone memory partitioning with the Secure Debug disabled to verify non-secure code cannot access secure regions.
Estimated: At maximum ambient temperature of 85°C and active current of 25µA/MHz at 32MHz, the device dissipates approximately 0.8mW in active mode. Thermal resistance of the 24-SSOP package is approximately 100°C/W, resulting in a junction temperature rise of less than 0.1°C above ambient. No thermal management is required for typical IoT duty cycles. However, sustained active operation at 3.63V with all peripherals enabled may increase current draw up to 2-3mA.
Keep the SWD (Serial Wire Debug) signals (SWDIO, SWCLK, RESET) routed with ground reference and avoiding cross-layer transitions to prevent debug interface failures. The 24-SSOP package has 0.65mm pitch - ensure PCB trace width does not exceed 0.3mm to maintain solder mask integrity. Place the external 32.768kHz crystal within 5mm of the XIN/XOUT pins with short symmetric traces and a guard ground ring to minimize capacitive loading.
Compliance Information
RoHS compliant per Microchip product page. Industrial temperature grade -40°C to +85°C. AEC-Q100 qualification is not applicable for this industrial-grade MCU variant.
