Table 2. Indicators and jumpers (continued)
Circuit ref (Rev E) Description Default Reference
to the i.MX RT685 VDDIO_0 supply
pins.
JP22
Selects the value of LDO_ENABLE.
High (1-2) or Low (2-3).
Open Schematic
JP23
This jumper is provided for optional
insertion of an ammeter to measure
supply current to the i.MX RT685
VDDIO_1 supply pins.
Closed
Measuring MIMXRT685-EVK
device supply current and
Schematic
JP24
This jumper is provided for optional
insertion of an ammeter to measure
supply current to the i.MX RT685
VDDA_BIAS supply pins.
Closed
Measuring MIMXRT685-EVK
device supply current and
Schematic
JP25
This jumper is provided for optional
insertion of an ammeter to measure
supply current to the i.MX RT685
VDDA_ADC1V8 supply pins.
Closed
Measuring MIMXRT685-EVK
device supply current and
Schematic
JP26 This jumper is provided for optional
insertion of an ammeter to measure
supply current to the i.MX RT685
VDDA_AO supply pins.
Closed Measuring MIMXRT685-EVK
device supply current and
Schematic
JP27
This jumper is provided for optional
insertion of an ammeter to measure
supply current to the i.MX RT685
VDDIO_2 supply pins.
Closed
Measuring MIMXRT685-EVK
device supply current and
Schematic
JP28
This jumper is provided for optional
insertion of an ammeter to measure
supply current to the i.MX RT685
RT685 VDD1V8 supply pins.
Closed
Measuring MIMXRT685-EVK
device supply current and
Schematic
JP29
This jumper is provided for optional
insertion of an ammeter to measure
supply current to the i.MX RT685
Core.
Closed
Measuring MIMXRT685-EVK
device supply current and
Schematic
JP30
This jumpers routes P1_5 to the
accelerometer interrupt pin.
Closed Schematic
J1
Additional / spare signal expansion
header.
N/A Additional expansion header
J16
UART header for i.MX RT685
Flexcom 0 UART. Note that JP4 must
be installed when using this UART to
avoid conflicts with the on-board
debug probe.
N/A USART header
J18
Header for access to I3C port. Note
that this port is also shared with the
N/A I3C header
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 11 / 31
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