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ULP Connected Wearable Activity Monitor



High-end wearable activity trackers can take step count, temperature, light and other movement and environment measurements. They are not only being used for fitness applications, but are becoming an essential part of medical device design. Microchip’s Ultra Low-Power or ULP Connected, Wearable Activity Monitor Demonstration Board can be used as the starting point for the design of medical home monitoring, patient tracking and drug delivery compliance devices.

This board is a high-end activity tracker demonstration and development board that not only measures a user’s motion and environment, but it can also be used as a starting point for the design of more advanced activity and biometric measurement devices These types of devices measure and analyze sleep quality, heart rate, body temperature, blood oxygen, etc. Bluetooth connectivity allows the demo to communicate with tablets, smartphones or PCs for IoT capability.

Microchip’s ULP Connected Wearable Activity Monitor Demonstration board features the SAML21—a high-performance, 32-bit ARM Cortex-M0+ microcontroller with Ultra Low-Power technology, the BTLC1000 4.1 Bluetooth Low Energy Module, the ECC508A CryptoAuthentication chip as well as movement and environmental sensor chips.

Design Files Download

ULP Wearable Activity Monitor schematics, hardware design package, firmware, user guide and demo app code are available for this demo


Demonstration Highlights

  • Ideal for designs that need medical patient tracking, patient compliance, patient biometric diagnostics, fitness activity tracking, etc.
  • Measures proximity, step count, free fall (detection), gyroscopic motion, ambient temperature, pressure (altitude), humidity and light
  • Allows for easy development of more advanced activity tracker functions (e.g. distance travelled, calories burned, sleep analysis, etc.)
  • Additional biometric measurement capability, such as heart rate, blood oxygen and body temperature can be added to this design using other Microchip reference designs
  • BLE module is used to demonstrate smartphone/tablet IoT capability
  • Low overall BOM cost due to high level of integration
  • Powered from a single 3V lithium coin cell battery
 SAML21 MCU Features
  • Ultra low-power, high-performance 32-bit ARM Cortex-M0+ MCU
  • Up to 256 KB of Flash and 40 KB of SRAM
  • Up to 48 MHz operating frequency
  • Up to 14-channels, 1 Msps 12-bit ADC
  • Two 1 MSPS 12-bit DACs
  • Three op amps
  • Full-speed USB device and embedded host
  • 16-channel DMA and 12-channel event system
  • AES and true Random Number Generator (RNG)
  • 32-bit RTC
  • Support for up to 81 touch channels (mutual capacitance)
  • 1.62 to 3.63V power supply
Buy the SAML21 MCU Now


RN4871 Bluetooth Low Energy Module Features

  • Bluetooth 5 certified
  • Easy-to-use ASCII command interface for communication with the host microcontroller
  • Module certified for use in USA, Canada, Brazil, Europe, Japan, Korea, Taiwan and China
  • Mobile application supported in Microchip Bluetooth Data (MBD)
  • Remote configuration capability
  • Ceramic chip antenna or external antenna connection
Buy the RN4871 Bluetooth Low Energy Module Now


ATECC608A CryptoAuthentication Secure Element Features

  • Cryptographic co-processor with secure hardware-based key storage
  • Protected storage for up to 16 keys, certificates or data
  • FIPS SP800-56A Elliptic Curve Diffie-Hellman (ECDH)
  • NIST standard P256 elliptic curve support
  • SHA-256 and HMAC hash including off-chip context save/restore
  • AES-128 encryption/decryption, Galois Field Multiply for GCM
Buy the ATECC608A CryptoAuthentication Secure Element Now

Related Product Pages

  • SAM L21 32-bit ARM® Cortex®-M0+ MCU
  • BTLC1000 ultra-low power Bluetooth Low Energy module (not recommended for new designs) RN4871 or RN4870 Bluetooth Low Energy modules are recommended for new designs
  • ATECC508A CryptoAuthentication™ secure element (not recommended for new designs) ATECC608A CryptoAuthentication secure element is recommended for new designs

Contact your local sales representative to see a working demonstration of Microchip's ULP Connected Wearable Activity Monitor Demonstration Board.


This reference demo helps designers develop a low-power, connected activity monitoring board with Bluetooth Low Energy capability for medical and fitness IoT applications.*

System Diagram


Development Made Easy

Start with the free download of the user guide, schematics and 'C' source code that can easily be modified to your specific application needs. To download see the Resources section above.

*Microchip medical reference designs and demos are intended for evaluation and development purposes only. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use.