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Figure 5-2. MCU Board Block Diagram
5.1.
Power Supply
The ATSAMC21J18A MCU takes 5VDC supply from the 67-pin edge connector. The EDBG debug MCU
operates on a 3.3VDC supply from the same edge connector. The power supply selection jumper on the
Driver board (ATSAMBLDCHV-STK and ATSAMBLDC24V-STK) should be connected to 5V (silk screen
text) selection.
5.2.
Main MCU Circuit
The ATSAMC21MOTOR has an ATSAMC21 device. The device is intended to work with the MCU internal
clock source. An external reset switch is connected to the MCU RESET pin.
5.3.
Embedded Debugger
The ATSAMC21J18A MCU is interfaced to the EDBG debug device. The EDBG uses SWD interface for
programming and debugging the main MCU. A debug header is also provided on the MCU board with
®
ARM Cortex
debug pinout. An external debugger can be connected to this debug port.
The DGI is a proprietary communication interface used by the Atmel Data Visualizer software to
communicate with the development kits through the EDBG. The SERCOM5 of the ATSAMC21J18A
connected to the EDBG device, supports the DGI SPI interface and uses the Atmel ADP protocol. The
MCU SERCOM5 is also connected to the UART channel of the EDBG through a pair of "normally open"
jumpers; J201 and J202. Shorting these jumpers will enable the CDC UART interface for the main MCU.
High Speed USB port of the EDBG is accessible at the driver board. EDBG USB enumerates as a
composite device supporting debug, DGI SPI, and CDC interfaces.
5.4.
67-pin MCU-DRIVER Board Interface
MCU pins are connected to the 67-pin interface header as given in the table below. The MCU card can be
used with the Motor control driver kits from Atmel. The table given below describes the interface with
Atmel low voltage motor control starter kit. Signals indicated by "||" are jumper connected pins that share
directly connected functionality. The normally-open jumper needs to be shorted in the PCB in order to
access these additional features.
Atmel ATSAMC21MOTOR [USER GUIDE]
Atmel-42770A-ATSAMC21MOTOR_User Guide-09/2016
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