Table 1. Connectors, LEDs, buttons and headers (continued)
Circuit ref (Rev E) Description Default Reference
D11 3.3 V power on LED (LD2_OUT when
JS11 shunted)
N/A Schematic
D15 SD card power LED (JS14 shunted) N/A Schematic
J2 10-pin Cortex-M target debug
header.
N/A Schematic
J3 Audio codec line input jack N/A Schematic
J4 Audio codec line output jack N/A Schematic
J5 On board debug probe (LINK USB)
micro B USB connector
N/A Schematic
J6
External +5 V power
Micro USB connection for power to
the i.MX RT685 target and peripheral
circuitry (excluding Link2 Debug
Probe).
N/A Schematic
J7 Micro AB High speed USB
connector Device/Host.
N/A USB high-speed port
J19 Debug Trace Connector. 20-pin
Cortex-M debug connector for i.MX
RT685 target, including trace pins.
N/A Schematic
J11, J20
Screw terminal connections for
external speakers. When attaching a
speaker, ensure that the appropriate
driver settings are used in the
TFA9894 devices to avoid damage
to the speaker.
N/A Schematic
J21 Batt charger. N/A Schematic
J24
Additional +5 V power connector.
This barrel type connector may be
used to supply additional power to
the digital amplifiers, if needed. It
does not power any of the other
circuitry on the board.
N/A Schematic
J27 – J30 J27, J28, J29, J30 Arduino
expansion connectors.
N/A Arduino connector
J31
External DMIC header. Provides
access to all DMIC (PDM) clock and
data lines, along with 1.8V (default
SW2_OUT)
N/A External DMIC
J32 SD/eMMC Card socket. N/A SD/eMMC card slot
J36
PMod/Host connector. This
connector provides access to the
N/A PMod connector
Table continues on the next page...
NXP Semiconductors
Board layout and settings
i.MX RT685 Evaluation Board, Rev. 0, March 20 2020
User's Guide 6 / 31
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