Contents
Chapter 1 Introduction........................................................................................... 3
Chapter 2 Board layout and settings......................................................................5
Chapter 3 Getting started.....................................................................................13
3.1 Starting a debug session using the on-board (Link2) Debug Probe........................................13
Chapter 4 On-board (Link2) debug probe............................................................15
4.1 Programming the Link2 firmware.............................................................................................15
4.2 VCOM port...............................................................................................................................16
Chapter 5 Board power........................................................................................17
5.1 Measuring MIMXRT685-EVK device supply current............................................................... 17
5.2 PMIC (PCA9420).....................................................................................................................17
Chapter 6 Board serial connections.....................................................................19
6.1 USB high-speed port............................................................................................................... 19
6.2 USART header........................................................................................................................ 19
6.3 I3C header...............................................................................................................................19
6.4 Flexcomm header....................................................................................................................19
6.5 Additional expansion header................................................................................................... 21
Chapter 7 On-board peripherals.......................................................................... 22
7.1 Audio Codec............................................................................................................................22
7.2 Audio digital amplifiers.............................................................................................................22
7.3 SD/eMMC card slot................................................................................................................. 23
7.4 Accelerometer......................................................................................................................... 23
7.5 User LEDS...............................................................................................................................23
7.6 Buttons.................................................................................................................................... 23
7.7 ISP boot config........................................................................................................................ 24
7.8 DMIC....................................................................................................................................... 25
Chapter 8 Expansion connectors.........................................................................27
8.1 PMod connector...................................................................................................................... 27
8.2 Arduino connector................................................................................................................... 27
Chapter 9 Other board features........................................................................... 30
9.1 MIMXRT685-EVK ADC references and inputs........................................................................30
NXP Semiconductors
i.MX RT685 Evaluation Board, Rev. 0, March 20 2020
User's Guide 2 / 31
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