ATSAML11E14A-MF - 32MHz Cortex-M23 MCU 16KB Flash TrustZone | Microchip
MPN: ATSAML11E14A-MF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.62 | $26.20 |
| 100 | $2.21 | $221.00 |
| 500 | $1.85 | $925.00 |
| 1,000 | $1.61 | $1,610.00 |
ATSAML11E14A-MF Overview
An ARM Cortex-M23 MCU is a 32-bit microcontroller built on the ARMv8-M baseline architecture. The Cortex-M23 is the smallest and most energy-efficient of the ARMv8-M family, optionally supporting TrustZone for hardware-isolated secure execution. The SAM L11 family extends the Cortex-M23 with chip-level tamper resistance, secure key storage, and a TRNG (true random number generator), positioning the part for connected devices that must protect firmware, keys, and sensor data against physical and remote attacks. Within Microchip's portfolio SAM L11 belongs to the low-power MCU family alongside SAM L10, SAM L21, and SAM D family microcontrollers.
Key features include a 32-bit single-cycle multiply hardware MAC, 32 KB SRAM with ECC, brown-out detection and reset, DMA, POR, PWM, and WDT. Communication interfaces include I2C, SPI, LINbus, and UART/USART. Up to 25 GPIO pins are available on the 32-pin VQFN. Security blocks include TrustZone-M, secure boot, hardware AES/SHA, and a True Random Number Generator backed by tamper-detection pins, making the part suited for PSA Certified Level 1 designs.
The architecture combines a Cortex-M23 core with a low-power peripheral set and an event system that lets peripherals wake the CPU without interrupt overhead. The crypto subsystem offloads AES and SHA, so secure TLS handshakes and firmware verification run in tens of milliseconds rather than blocking the main thread. Voltage scaling from 1.6V to 3.6V and a low-power sleep mode below 100 nA enable multi-year coin-cell operation.
Typical applications include secure IoT sensor nodes, smart meters, access control readers, medical wearables, and asset-tracking tags that require authenticated firmware and encrypted sensor telemetry. The SAM L11 also suits building automation, factory floor sensors, and connected appliances.
When designing with this part, budget VDD decoupling at each supply pin and route the exposed pad to a continuous ground plane for thermal dissipation. Configure TrustZone linker regions early in the BSP so secure and non-secure code partitions are enforced by hardware, not convention.
This page synthesizes distributor pricing, drop-in alternatives within the SAM L11 family and across vendors, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATSAML11E14A-MF — 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-MF (same form factor and footprint) — differing in Package, Operating Temperature, Active Current, Core Architecture, Flash Memory.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAML11E15A-MF
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAML11E14A-MUT
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →ATSAML11E15A-MUT
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →ATSAML11D15A-MU
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.95 / Unit
View Datasheet →ATSAML11E16A-MF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.05 / Unit
View Datasheet →ATSAML11E14A-MF Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M23 |
| Core Size | 32-bit single-core |
| Maximum Clock Speed | 32 MHz |
| Program Memory Size | 16 KB (16K x 8) Flash |
| RAM Size | 8 KB SRAM |
| Supply Voltage | 1.6 V to 3.6 V |
| Active Current | <25 uA/MHz |
| Sleep Current | <100 nA |
| Package | 32-pin VQFN (5x5 mm) |
| Mounting Type | Surface Mount |
| GPIO Count | 25 |
| Connectivity | I2C, SPI, UART/USART, LINbus |
| Peripherals | Brown-out Detect/Reset, DMA, POR, PWM, WDT |
| Security | ARM TrustZone-M, secure boot, AES/SHA, TRNG, secure key storage, tamper detection |
| Operating Temperature | -40C to +125C (125 Temp suffix) |
| RoHS Status | Compliant |
ATSAML11E14A-MF Pin Configuration
| Pin 1 | VDDIO — Digital I/O supply voltage |
| Pin 2 | GND — Ground |
| Pin 3 | PA00 — GPIO / XIN |
| Pin 4 | PA01 — GPIO / XOUT |
| Pin 5 | PA02 — GPIO / ADC[0] |
| Pin 6 | PA03 — GPIO / ADC[1] |
| Pin 7 | PA04 — GPIO / ADC[2] |
| Pin 8 | PA05 — GPIO / ADC[3] |
| Pin 9 | PA06 — GPIO / ADC[4] |
| Pin 10 | PA07 — GPIO / ADC[5] |
| Pin 11 | PA08 — GPIO / I2C SDA |
| Pin 12 | PA09 — GPIO / I2C SCL |
| Pin 13 | PA10 — GPIO / UART RX |
| Pin 14 | PA11 — GPIO / UART TX |
| Pin 15 | PA14 — GPIO / SWDIO |
| Pin 16 | PA15 — GPIO / SWCLK |
| Pin 17 | PA16 — GPIO / Tamper input |
| Pin 18 | PA17 — GPIO / Tamper input |
| Pin 19 | PA18 — GPIO / SPI MOSI |
| Pin 20 | PA19 — GPIO / SPI MISO |
| Pin 21 | PA20 — GPIO / SPI SCK |
| Pin 22 | PA21 — GPIO / SPI SS |
| Pin 23 | PA22 — GPIO / PWM[0] |
| Pin 24 | PA23 — GPIO / PWM[1] |
| Pin 25 | PA24 — GPIO |
| Pin 26 | PA25 — GPIO |
| Pin 27 | PA27 — GPIO / Boot entry |
| Pin 28 | PA28 — GPIO |
| Pin 29 | RESETn — Active-low reset input |
| Pin 30 | VDD — Core supply voltage |
| Pin 31 | GND — Ground |
| Pin 32 | EP — Exposed thermal pad - tie to GND |
Typical Applications
ATSAML11E14A-MF is suitable for 6 applications: Secure IoT Sensor Nodes, Smart Meter Endpoints, Access Control and Smart Locks, Medical Wearables, Building Automation Sensors, Asset Tracking Tags.
Secure IoT Sensor Nodes
The ATSAML11E14A-MF is purpose-built for secure IoT sensor nodes where firmware protection and authenticated telemetry matter. Its ARM Cortex-M23 with TrustZone-M isolates crypto keys from application code, while hardware AES/SHA and a TRNG offload TLS handshakes so the core stays asleep longer. Active current under 25 uA/MHz and deep-sleep under 100 nA allow coin-cell lifetimes of multiple years when paired with sub-GHz or BLE modules. The 32-VQFN footprint is small enough for coin-cell enclosures, and 25 GPIO let you interface temperature, humidity, accelerometer, and PIR sensors simultaneously.
Recommended
Smart Meter Endpoints
Smart electricity, water, and gas meters benefit from the ATSAML11E14A-MF's tamper detection pins, secure boot, and hardware AES. Tamper events can immediately invalidate authentication tokens stored in the secure key store, while 16 KB Flash is enough for metering firmware plus a small DLMS/COSEM or Wireless M-Bus stack. The 1.6V to 3.6V supply range covers direct battery or super-cap rail operation. Combined with low active current and 100 nA sleep, the part supports 10+ year meter deployments with infrequent battery swap windows.
Recommended
Access Control and Smart Locks
Smart locks and access control readers require authenticated firmware and tamper-resistant credential storage - exactly what ATSAML11E14A-MF TrustZone-M provides. The 32-bit Cortex-M23 with hardware AES handles BLE pairing, NFC credential verification, and motor control PWM. The 25 GPIO can drive a keypad matrix, status LEDs, a buzzer, and a half-bridge motor driver, all from a single MCU. Deep-sleep current under 100 nA preserves battery life when the lock is idle.
Recommended
Medical Wearables
Medical wearables such as continuous glucose monitors, pulse oximeters, and patch sensors use the ATSAML11E14A-MF to keep patient data encrypted at rest and in transit. The hardware SHA block computes HMACs over sensor samples to detect tampering, while TrustZone isolates the BLE stack from the application. With under 25 uA/MHz active, the part fits in a coin-cell powered patch, and the 32-VQFN 5x5 mm package sits comfortably inside a flexible PCB enclosure.
Recommended
Building Automation Sensors
Building automation systems - HVAC controllers, occupancy sensors, lighting nodes - rely on the ATSAML11E14A-MF for low-power secure wireless operation. The LINbus interface connects to legacy HVAC wiring, while SPI/I2C link to modern radios. TrustZone ensures that lighting schedules and occupancy credentials cannot be tampered with even if the firmware is compromised. Sleep current under 100 nA lets the part sit in an idle battery node for years between wakes.
Recommended
Asset Tracking Tags
Bluetooth or LoRa asset-tracking tags use the ATSAML11E14A-MF to authenticate location beacons and sign firmware updates. The TRNG and hardware AES let the tag negotiate secure sessions with a gateway in milliseconds, then drop back into sub-100 nA sleep until the next wake. The 32-VQFN package suits ultra-thin enclosures, and TrustZone secures the device certificate over the multi-year tag lifetime.
Recommended
Recommended Products Summary
Engineering reference data for ATSAML11E14A-MF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAML11E15A-MF | ATSAML11E14A-MUT | ATSAML11E15A-MUT | ATSAML11D15A-MU | ATSAML11E16A-MF |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 32-VQFN (5x5) | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same | 32-VQFN (5x5) - same |
| Core | ARM Cortex-M23 | ARM Cortex-M23 | ARM Cortex-M23 | ARM Cortex-M23 | ARM Cortex-M23 | ARM Cortex-M23 |
| Clock Speed | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Flash | 16 KB | 32 KB | 16 KB | 32 KB | 32 KB | 64 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 16 KB |
| TrustZone | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +85C (U suffix) | -40C to +85C (U suffix) | -40C to +85C | -40C to +125C |
Key Differentiators
- Only SAM L11 with 16 KB Flash in the same VQFN-32 footprint (vs ATSAML11E15A-MF)
- Industrial temperature grade (-40C to +125C) (vs ATSAML11E14A-MUT)
- TrustZone-M hardware isolation with TRNG (vs ATSAML10E16A-MF)
Design Notes
The 32-VQFN package exposes pad (EP) on pin 32 must be soldered to a continuous, unbroken ground plane. Estimated: for 100 mA active current at 3.3V this provides a thermal resistance (theta_JA) of approximately 35 C/W. Avoid signal traces beneath the EP and place at least four thermal vias in the EP landing pattern to keep junction temperature below 100 C in enclosed industrial housings.
Decouple VDD and VDDIO separately. Place a 1 uF X7R ceramic and a 100 nF X7R ceramic as close as possible to each supply pin, with vias kept short to the inner ground plane. The ATSAML11E14A-MF can source peak currents above 20 mA during flash writes; insufficient decoupling will cause brown-out resets. A 10 uF bulk cap on the main rail is recommended for battery applications where source impedance rises at end of life.
Configure TrustZone linker regions in the project setup BEFORE writing application code. TrustZone-M is enforced by hardware, so a missing NSS region declaration causes linker errors rather than runtime faults. Also, ensure tamper pins (PA16/PA17) are bonded to defined logic levels if unused - leaving them floating can trigger spurious tamper events and lock secure key access until next POR.
Keep the SWD programming header (SWDIO on PA14, SWCLK on PA15) within 50 mm of the MCU with no series resistors in production builds. SWD impedance mismatches cause intermittent programming failures on prototype boards. For secure production programming, route these pins to test pads only - do not expose them on user-facing connectors.
Compliance Information
RoHS and lead-free confirmed by Microchip product page; halogen-free status and AEC-Q100 not stated in the verified data.
