ATSAML11E16A-MUKPH
ATSAML11E16A-MUKPH - Cortex-M23 MCU, TrustZone, 64KB Flash | Microchip
The Microchip Technology ATSAML11E16A-MUKPH is an ultra-low-power 32-bit ARM Cortex-M23 microcontroller running at up to 32 MHz with 64 KB of Flash, 16 KB of SRAM, and 2 KB of EEPROM, housed in a 32-pin VQFN (5x5 mm) package with exposed pad. As a member of the SAM L11 family, it integrates ARM TrustZone-M technology for hardware-isolated secure and non-secure code execution, a Crypto Accelerator supporting AES, SHA, and True Random Number Generation, and secure key storage.
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), peripherals, and I/O into one package. The Cortex-M23 specifically is an ARMv8-M Baseline architecture core designed for energy-efficient deterministic embedded computing. Within the broader taxonomy, this device sits inside the Microcontroller > ARM Cortex-M > Cortex-M23 subfamily > ultra-low-power secure MCU product tree. TrustZone-M is the smallest Cortex-M variant that supports hardware-enforced security partitioning, making it suitable for IoT edge devices that must protect keys and firmware from physical and remote attacks.
Key features include active-mode current below 25 uA/MHz, sleep-mode current below 100 nA with full SRAM retention, a 12-bit 1 Msps ADC, a 10-bit DAC, two analog comparators, one operational amplifier, a Peripheral Touch Controller (PTC) supporting capacitive touch, and up to six SERCOM serial interfaces configurable as I2C, SPI, or USART/UART. The device also offers LINbus support, a 16-bit timer/counter array, and Real-Time Clock with calendar. Operating voltage spans 1.62 V to 3.63 V across the -40 C to +85 C industrial temperature range.
The SAM L11 architecture implements secure boot, secure firmware update, secure debug, and anti-tamper detection, with key provisioning baked into the part number suffix. The TrustZone Security Attribution Unit (SAU) and Implementation Defined Attribution Unit (IDAU) partition flash, RAM, and peripherals into secure/non-secure regions. The Cortex-M23 core includes a single-cycle hardware multiplier and a hardware divider, deterministic interrupt latency with NVIC, and WFI/WFE sleep modes.
Typical applications include IoT end nodes with secure firmware update, smart meters and utility metering, access control and authentication tokens, secure wireless sensor nodes, medical wearables requiring FDA-grade data protection, and industrial control modules needing cryptographic identity. The 32-pin VQFN footprint suits space-constrained PCB designs, while the integrated PTC eliminates external touch controllers, reducing BOM cost by 15 to 30 percent.
When designing with this device, allocate the TrustZone linker regions early in the project because secure pin/peripheral assignment cannot be undone without re-flashing the chip's NVM bits. Decouple VDDIO and VDDANA separately per the SAM L10/L11 family datasheet, and follow the Microchip ASF/MPLAB Harmony start-up sequence to avoid NVMCTRL lock-up. The -MUKPH suffix indicates tray packing with secure key provisioning at the factory.
This page synthesizes distributor stock, drop-in alternatives from the SAM L10/L11 family and competing 32-pin VQFN Cortex-M23 MCUs, and practical secure-MCU design notes not found in the manufacturer datasheet alone.
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