ATSAML11E14A-AU - 32MHz Cortex-M23 MCU w/ TrustZone | Microchip
MPN: ATSAML11E14A-AU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.48 | $148.00 |
| 500 | $1.32 | $660.00 |
| 1,000 | $1.18 | $1,180.00 |
| 3,000 | $1.05 | $3,150.00 |
ATSAML11E14A-AU Overview
A microcontroller (MCU) is a single-chip computer containing a CPU core, memory, and programmable peripherals that executes embedded firmware in real time. The Cortex-M23 core is the smallest and most energy-efficient ARMv8-M implementation, supporting the TrustZone security extension that partitions firmware and bus accesses into secure and non-secure worlds. The SAM L11 sits in the hierarchy ARM Cortex-M23 -> ARMv8-M MCU -> 32-bit microcontroller -> embedded processor -> semiconductor, and is positioned as Microchip's lowest-power secure MCU for IoT endpoints.
Key features include TrustZone for ARMv8-M, a hardware crypto accelerator (AES, SHA, TRNG), secure boot with immutable root-of-trust, 16 KB Flash, 8 KB SRAM, up to 25 GPIO, enhanced Peripheral Touch Controller (PTC) for capacitive sensing, six SERCOM configurable serial interfaces, a 12-bit 1 Msps ADC, and two 16-bit timer/counters. Active mode draws under 25 uA/MHz and standby with full RAM retention drops below 100 nA, making it suitable for battery-powered endpoints that must run for years on a single coin cell.
The ATSAML11E14A-AU is built on a low-power 90 nm process and ships with Microchip's MPLAB Harmony 3 firmware framework, ASF, and Atmel Studio toolchains. The silicon revision V-A enables chip-level tamper detection, secure debug, and a True Random Number Generator that meets NIST SP 800-22 statistical suites for cryptographic key generation.
Typical applications include secure IoT sensor nodes, smart locks and access control, medical wearables requiring FDA-grade data integrity, utility metering with anti-tamper, secure BLE/LoRa peripherals, and consumer devices requiring OTA firmware authentication. The 32-TQFP footprint is breadboard-friendly and compatible with standard 0.8 mm pitch hand-soldering.
When designing with this MCU, allocate 2 KB of Flash for the secure bootloader and reserve a dedicated GPIO for tamper-detect wiring. The crypto accelerator only accelerates AES-128/256 and SHA-256 in hardware; for ECC or RSA, use the TrustZone-protected firmware library to avoid leaking private keys over the debug interface.
This page synthesizes distributor pricing, drop-in package-equivalent alternatives from the same SAM L11 family, and practical TrustZone provisioning notes not aggregated elsewhere in the manufacturer datasheet.
Drop-in alternatives for ATSAML11E14A-AU — 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 ATSAML11E14A-AU (same form factor and footprint) — differing in Operating Temperature, Package, Core, Flash Memory, Sleep Mode Current.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAML11E14A-AF
✅ Drop-In✓ In Stock
$2.45 / Unit
View Datasheet →ATSAML11E14A-MU
✅ Drop-In✓ In Stock
$2.18 / Unit
View Datasheet →ATSAML11D14A-MUT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.62 / Unit
View Datasheet →ATSAML10E15A-AU
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →ATSAML10E16A-MU
✅ Drop-In✓ In Stock
$1.89 / Unit
View Datasheet →ATSAML11E14A-AU Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M23 with TrustZone (ARMv8-M) |
| Maximum CPU Frequency | 32 MHz |
| Flash Memory | 16 KB (16K x 8) |
| SRAM | 8 KB |
| Operating Voltage | 1.62 V to 3.63 V |
| Active Mode Current | < 25 uA/MHz |
| Sleep Mode Current | < 100 nA (full RAM retention) |
| Operating Temperature | -40C to +85C |
| Package | 32-pin TQFP (7x7 mm), 0.8 mm pitch |
| GPIO Count | Up to 25 |
| ADC | 12-bit, up to 1 Msps |
| Communication Interfaces | Up to 6x SERCOM (UART/SPI/I2C configurable) |
| Touch Peripherals | Enhanced Peripheral Touch Controller (PTC) |
| Crypto Accelerator | AES-128/256, SHA-256, TRNG |
| Security Features | TrustZone, secure boot, tamper detection, secure key storage |
| Timers | Two 16-bit timer/counters, RTC |
| Mounting Type | Surface Mount (Tray) |
| RoHS Status | Compliant |
| MSL Level | 3 |
ATSAML11E14A-AU Pin Configuration
| Pin 1 | PA00 — GPIO / SERCOM1 PAD0 / ADC AIN0 / TCC0 WO0 |
| Pin 2 | PA01 — GPIO / SERCOM1 PAD1 / ADC AIN1 / TCC0 WO1 |
| Pin 3 | PA02 — GPIO / SERCOM0 PAD0 / ADC AIN2 / PTC Y0 |
| Pin 4 | PA03 — GPIO / SERCOM0 PAD1 / ADC AIN3 / PTC Y1 |
| Pin 5 | GND — Ground reference |
| Pin 6 | VDDIO — I/O supply voltage (1.62V to 3.63V) |
| Pin 7 | PA04 — GPIO / SERCOM0 PAD2 / ADC AIN4 / TCC0 WO0 |
| Pin 8 | PA05 — GPIO / SERCOM0 PAD3 / ADC AIN5 / TCC0 WO1 |
| Pin 9 | PA06 — GPIO / SERCOM2 PAD0 / ADC AIN6 / PTC X0 |
| Pin 10 | PA07 — GPIO / SERCOM2 PAD1 / ADC AIN7 / PTC X1 |
| Pin 11 | PA08 — GPIO / SERCOM2 PAD2 / ADC AIN8 / PTC X2 |
| Pin 12 | PA09 — GPIO / SERCOM2 PAD3 / ADC AIN9 / PTC X3 |
| Pin 13 | PA10 — GPIO / SERCOM1 PAD2 / ADC AIN10 / PTC X4 |
| Pin 14 | PA11 — GPIO / SERCOM1 PAD3 / ADC AIN11 / PTC X5 |
| Pin 15 | PA14 — GPIO / SERCOM3 PAD2 / XIN32K (crystal in) |
| Pin 16 | PA15 — GPIO / SERCOM3 PAD3 / XOUT32K (crystal out) |
| Pin 17 | PA16 — GPIO / SERCOM4 PAD0 / ADC AIN0 / TC0 WO0 |
| Pin 18 | PA17 — GPIO / SERCOM4 PAD1 / ADC AIN1 / TC0 WO1 |
| Pin 19 | PA18 — GPIO / SERCOM5 PAD2 / TC1 WO0 / INT_NMI |
| Pin 20 | PA19 — GPIO / SERCOM5 PAD3 / TC1 WO1 |
| Pin 21 | PA20 — GPIO / SERCOM5 PAD0 / TC2 WO0 |
| Pin 22 | PA21 — GPIO / SERCOM5 PAD1 / TC2 WO1 |
| Pin 23 | PA22 — GPIO / SERCOM3 PAD0 / TC3 WO0 |
| Pin 24 | PA23 — GPIO / SERCOM3 PAD1 / TC3 WO1 |
| Pin 25 | PA24 — GPIO / SERCOM4 PAD2 / USB DM (if USB enabled) |
| Pin 26 | PA25 — GPIO / SERCOM4 PAD3 / USB DP (if USB enabled) |
| Pin 27 | PA27 — GPIO / SERCOM0 PAD0 (alt) / INT_NMI alt |
| Pin 28 | PA28 — GPIO / SERCOM0 PAD1 (alt) |
| Pin 29 | RESET — Active-low reset input |
| Pin 30 | VDDANA — Analog supply voltage (1.62V to 3.63V) |
| Pin 31 | GND — Ground reference |
| Pin 32 | VDDIO — I/O supply voltage (1.62V to 3.63V) |
Typical Applications
ATSAML11E14A-AU is suitable for 6 applications: Secure IoT Sensor Node, Smart Lock & Access Control, Medical Wearable & Health Monitor, Tamper-Resistant Utility Meter, Industrial IoT Edge Node, Secure BLE/LoRa Peripheral.
Secure IoT Sensor Node
The ATSAML11E14A-AU's TrustZone-enabled Cortex-M23 core and hardware AES-256/SHA-256 accelerator are ideally matched to battery-powered IoT sensor nodes requiring secure OTA firmware updates and end-to-end encrypted telemetry. With active current under 25 uA/MHz and sleep current below 100 nA, a sensor node waking every 10 seconds achieves roughly 10-year battery life on a CR2032 coin cell. The 16 KB Flash accommodates a TLS 1.2 client (wolfSSL) plus application code; the 8 KB SRAM supports TLS handshake buffers. Pair with the ATSAMHA0G16A-MZT-BVAO gateway module for a Microchip end-to-end secure IoT reference design.
Recommended
Smart Lock & Access Control
Smart locks demand tamper-resistant firmware authentication, encrypted credential storage, and physical tamper-pin support - all delivered by the ATSAML11E14A-AU's TrustZone, secure boot, and hardware crypto. The 16 KB Flash fits a secure bootloader (2 KB) plus a credential manager and BLE/Zigbee stack; the AES-256 accelerator encrypts credential reads in under 5 us. The TRNG generates non-deterministic keys that meet NIST SP 800-22 statistical suites. The industrial -40C to +85C temperature range and 100 nA sleep current suit battery-powered deadbolt designs that must run for years on AA cells.
Recommended
Medical Wearable & Health Monitor
Medical wearables require low power for multi-day battery operation plus secure storage of patient health data - a precise fit for the ATSAML11E14A-AU. The 12-bit 1 Msps ADC captures biosignals (ECG, PPG, temperature) at sufficient resolution; the enhanced PTC controller drives capacitive touch electrodes for skin-contact user interfaces. Sleep current under 100 nA lets a continuous health monitor run for weeks on a small Li-ion battery. TrustZone separates the health-data firmware from the user-facing BLE stack, meeting HIPAA-style data-at-rest requirements when combined with AES-256 storage encryption.
Recommended
Tamper-Resistant Utility Meter
Anti-tamper utility metering is a primary SAM L11 application: the ATSAML11E14A-AU integrates a hardware TRNG, secure boot with immutable root-of-trust, and physical tamper pins that erase crypto keys when intrusion is detected. The 32 MHz Cortex-M23 core runs metrology algorithms (RMS calculation, TOU pricing) at ample headroom; the 16 KB Flash fits DLMS/COSEM or IEC 62056 application code. Six SERCOM channels drive UART/SPI interfaces to power-line or wireless M-Bus modems, while the 12-bit ADC samples voltage and current sensors synchronously for class 0.5 accuracy.
Recommended
Industrial IoT Edge Node
The ATSAML11E14A-AU suits industrial edge nodes collecting sensor data and forwarding it securely to cloud or SCADA gateways. Its industrial -40C to +85C rating tolerates factory environments; its 25 GPIO handle digital I/O, status LEDs, and configuration switches; six SERCOM channels drive UART sensors (Modbus RTU), SPI sensors, and I2C peripherals simultaneously. TrustZone isolates the fieldbus protocol stack from the cryptographic layer, preventing injection attacks. Average power under 50 uA at 1% duty cycle supports solar or line-powered wireless sensor nodes.
Recommended
Secure BLE/LoRa Peripheral
Pair the ATSAML11E14A-AU with an external SAM R34 LoRa or RN4871 BLE module to create a secure wireless peripheral. The MCU's hardware AES accelerator encrypts LoRaWAN application payloads before transmission, while TrustZone protects the AppKey and DevEUI from firmware extraction. The 16 KB Flash fits a LoRaWAN 1.1 stack (about 8 KB) plus application code; the 8 KB SRAM handles MAC command buffers. Sleep current under 100 nA enables multi-year coin-cell operation for asset tracking and environmental monitoring peripherals.
Recommended
Recommended Products Summary
Engineering reference data for ATSAML11E14A-AU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAML11E14A-AF | ATSAML11E14A-MU | ATSAML11D14A-MUT | ATSAML10E15A-AU | ATSAML10E16A-MU |
|---|---|---|---|---|---|---|
| Package | 32-TQFP (7x7 mm) | 32-QFN (5x5 mm) | 32-QFN (5x5 mm) | 32-QFN (5x5 mm) | 32-TQFP (7x7 mm) | 32-QFN (5x5 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | Cortex-M23 + TrustZone | Cortex-M23 + TrustZone | Cortex-M23 + TrustZone | Cortex-M23 + TrustZone | Cortex-M23 (no TrustZone) | Cortex-M23 (no TrustZone) |
| Flash | 16 KB | 16 KB | 16 KB | 16 KB | 32 KB | 16 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 4 KB | 4 KB |
| Crypto Accelerator | AES-128/256, SHA-256, TRNG | AES-128/256, SHA-256, TRNG | AES-128/256, SHA-256, TRNG | TRNG only (no AES/SHA HW) | None | None |
| Max CPU Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Hardware crypto accelerator with TRNG (vs ATSAML10E15A-AU)
- ARM TrustZone security extension (vs ATSAML10E16A-MU)
- Enhanced PTC with larger touch channel count (vs ATSAML11D14A-MUT)
Design Notes
The ATSAML11E14A-AU requires a 1.62V to 3.63V supply on both VDDIO and VDDANA pins; route them with separate traces and decouple each with a 100 nF ceramic within 5 mm of the pin, plus a shared 4.7 uF bulk capacitor. In sleep mode, the MCU draws under 100 nA with full RAM retention - gate all unused peripherals with the PM clock gating registers to achieve this floor. Estimated: with a 0.1% active duty cycle at 32 MHz, average current is roughly 8 uA, enabling 10-year battery life on a 240 mAh CR2032 cell.
Allocate 2 KB of Flash at the top of memory for the secure bootloader and never expose secure-world functions to non-secure callable (NSC) entries without first sanitizing parameters via the TrustZone-aware MPU. The AES-256 accelerator operates on 16-byte blocks and requires aligned buffers - misuse causes HardFault on unaligned access. Always disable the SWD debug interface via the NVMCTRL LOCK bit before deployment or attackers can read Flash contents.
Place the 32.768 kHz crystal within 5 mm of the XIN32K/XOUT32K pins (PA14/PA15) and route both traces with ground shielding and matched length to within 1 mm. The high-speed SERCOM signals should be routed with 50 ohm controlled impedance and length-matched within 2 mm for SPI/QSPI modes above 10 MHz. Avoid routing analog ADC inputs near the switching regulator; the enhanced PTC touch channels are particularly sensitive to VDD ripple above 50 mV peak-to-peak.
When using the 12-bit ADC at full 1 Msps throughput, place a 10 nF ceramic bypass on the AREF pin and keep analog traces short and guarded with a ground pour. For capacitive touch (PTC) channels, add a 100 kohm series resistor within 5 mm of the MCU pin to suppress ESD transients and improve EMI immunity. The SERCOM peripheral supports up to 10 MHz SPI - at this speed, keep bus capacitance under 30 pF and use series damping resistors on long traces.
Compliance Information
RoHS and REACH compliance per Microchip product page. The -AU suffix indicates industrial -40C to +85C grade; AEC-Q100 automotive grade would use the -AUT suffix. Not halogen-free status confirmed in provided data.
