Extremely small form factor Single Board Computer

  • 500 MHz single core Arm® Cortex®-A5 MPU
  • 256 MB RAM
  • Extremely small-form factor
  • Built-in battery management
  • Long off-grid operation
  • Arm® TrustZone®
  • Stackable GPIO headers
  • Ethernet, Wi-Fi, Bluetooth, USB-C

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KSTR-SAMA5D27 – Single Board Computer

The Conclusive Engineering Kestrel KSTR-SAMA5D27 is a Single Board Computer featuring a SAMA5D27, ARM® Cortex®-A5 based System on Chip from Microchip. Delivering around 785 DMIPS at 500MHz, this is one of the leanest SoCs capable of running a full Linux or FreeBSD operating system. Kestrel is designed for long battery operation and energy efficiency. It can be powered directly by a Li-Ion or Li-Poly battery thanks to an integrated battery management system. It’s capable of several deep sleep states, and has a real-time clock powered by a separate on-board battery, that can be used to manage the board’s power cycles and wake/sleep timers.

Kestrel is capable of running real-time workloads, and offers great connectivity options for external devices with a total of over 60 IO lanes and Fast Ethernet with a dedicated controller. All this on a PCB that’s smaller than a credit card.

It also delivers advanced security features, including Arm TrustZone®, tamper detection, secure data storage, and secure boot, as well as high-performance crypto accelerators such as AES, SHA, and TRNG.


SoCMicrochip SAMA5D27, 1 core Arm® Cortex®-A5 500 MHz 32-Bit CPU
SoC Features
  • Arm® TrustZone®
  • Secure Boot
  • Hardware encryption engine
  • Memory Integrity Monitor
  • Real-time clock on-die
  • Less than 200 μA low power state with fast wake up
  • 5 μA backup mode
Memory256 MB LPDDR2
  • 10/100 Mbit/s Ethernet (RJ-45)
Wireless connectivity
  • 2.4 GHz WLAN IEEE 802.11 b/g/n
  • Bluetooth 4.1
Mass storage
  • SD card slot
  • 1x USB 2.0 OTG (USB Type-C connector)
  • 1x USB 2.0 Host (on expansion header)
  • Console debug UART on the expansion header
  • Conclusive Developer Cable connector providing access to:
  • System UART
  • JTAG port
  • System I2C bus (EEPROM programing)
Software support
  • Linux 6.1 & 6.5
  • U-Boot
  • Yocto
  • Buildroot
  • Ubuntu
  • FreeBSD (on request)
Additional features
  • 3 status LEDs – Power Indicator, System Heartbeat, user programmable
  • RTC
  • Battery backup (CR1220) for RTC and static RAM
  • VDDIO voltage switch pins (3.3 V or 1.8 V selection)
  • Reset switch
  • 34 and 30 pin connectors with the following interfaces:
  • 3.3 V, 2.5 V, 1.8 V, 5.0 V and VBAT power supply pins
  • 2x Flexcom (configurable: I2C, SPI, UART)
  • I2C
  • 6 channel ADC with Vref
  • 10-bits ISC (Image Sensor Controller), 10-bit and 12-bit sensors support
  • 4-channel PWM
  • Timer I/O
  • CAN
  • USB
  • PDMIC audio input
  • Console UART
  • QWIIC connector
Power supply
  • USB Type-C connector
  • External Li-Ion battery with charging, charge level and temperature monitoring support. 3 pin connector and solder pads.
Dimensions50×70 mm

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