Ultra-low power, high performance board with efficient power management for wearable devices


SDT32620B has been designed by Sigma Delta Technologies for easy prototyping of IoT devices. The small coin-sized board is packed with high-performance MCU and highly accurate power management capability, making it especially ideal for development of small wearable smart devices. The MAX32620IWG+ MCU features an ARM® Cortex® -M4F core with 96MHz clock, embedding 256KB SRAM and 2MB flash memory. The board is also highly power efficient with Ultra-low power PMIC and Fuel Gauge. You can connect power through a cable, or attach a battery through the pads on the board. The board provides abundant peripherals of three UART interfaces, four SPI interfaces, three I²C interfaces, seven GPIO pins and four 10-Bit ADCs.

Board Features

  • MCU
    • Maxim Integrated MAX32620IWG+ in 81 WLP
    • Arm® Cortex®-M4F, 96MHz
  • PMIC
    • Maxim Integrated MAX77650BEWV+T in 30 WLP
    • 3-Output SIMO and charger optimized for small Li+
  • Fuel Gauge
    • Maxim Integrated MAX17055EWL+ in 9 WLP
    • 7µA 1-Cell Fuel Gauge with ModelGauge m5 EZ
  • Power
    • 1.2V Core supply voltage, 1.8V and 3.3V I/O
    • 3.7V Li+ Battery or 5V(VBUS) for power supply
  • Memories
    • 2MB Flash memory
    • 256KB SRAM
  • Security
    • Supporting AES-128, AES-192, AES-256
  • Serial Peripherals
    • USB 2.0 (12Mbps)
    • 3 x UART interface
    • 4 x SPI interface
    • 3 x I²C interface
    • 1-Wire® master
    • 7 x GPIO
    • 4 x 10-Bit ADC
    • JTAG
    • Serial Wire Debug (SWD)

#Sigma Delta Technologies

DAP Station & Interface

At Sigma Delta Technologies Inc., the SDT Board is a board with a target MCU which can be connected with the DAP Station through micro-connectors. SDT Boards are used with the DAP Station and Interface for easy programming and debugging.


SDT Boards cannot be programmed independently, so please refer to the below links for DAP Station and Interface.

Board Pinout

1. JB Pinout

The JB1 and JB2 of SDT Board should be connected to JT1 and JT2 of DAP Station


The following pins are connected to the DAP Station:

  • 7 types of power connector: VBUS, VSYS, VBAT, VCC, 3.3V, 1.8V, 1.2V
  • I/O Pin
    - 4 x 10-Bit ADC
    - 7 x GPIO
  • Communication Pin
    - 3 x UART Interface
    - 4 x SPI Interface
    - 3 x I²C Interface
  • JTAG
  • SWD
  • GND

JT Pinout

This connector enables peripherals to be attached on top of the SDT Board. There is a comparably fewer number of pins than JB1 and JB2 of the SDT Board.


The following pins are connected to the above JT1 and JT2:

  • 5 types of power connector: VBUS, VSYS, VBAT, 3.3V, 1.8V
  • I/O Pin
    - 4 x 10-Bit ADC
    - 6 x GPIO
  • Communication Pin
    - 2 x UART Interface
    - 2 x SPI Interface
    - 2 x I²C Interface
  • GND

Pin names

Getting Started with mbed

1. Connect your microcontroller to a PC

Use the USB lead to connect your mbed to a PC. The status light will come on, indicating it has power. After a few seconds of activity, the PC will recognise the mbed Microcontroller as a standard USB drive.

Windows XP exampleMac OS X example

Go to the new USB Drive, and click MBED.HTM to open it in a web browser.

If you do not have an mbed account, choose "Signup", and create your mbed Account. Otherwise, log in with your normal username and password.

This will give you access to the website, tools, libraries and documentation.

PC Configuration

Your mbed Microcontroller can appear on your computer as a serial port. On Mac and Linux, this will happen by default. For Windows, you need to install a driver:


See Windows-serial-configuration for full details about setting up Windows for serial communication with your mbed Microcontroller

From a host PC to communicate with mbed you will need a terminal application. This allows the mbed Microcontroller to print to your PC screen, and for you to send characters back to your mbed.

  • Terminals - Using Terminal applications to communicate between the Host PC and the mbed Micrcontroller

Some terminal programs (e.g. TeraTerm) list the available serial ports by name. However, if you do need to know the identity of the serial port so that you can attach a terminal or an application to it:

Find the identity of the COM port by opening ''Device Manager''. To do this navigate ''Start -> Control Panel -> System -> Hardware -> Device Manager''.To find the device name under Mac OS X, use the command ''ls /dev/tty.usbmodem*''To find the device name under Linux, use the command ''ls /dev/ttyACM*''

Example Code

Import programSDT-example-blinky

Example for Serial communication and LED Blinky

  • SDT3976C(wifi component) is needed to use [SDT-example-wifi] example code.


Data Sheets

See also

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