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Open429I-C User Manual
Version: V1.3.3, Date: 2019.04.02
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47
7.
Power indicator
8.
VBUS LED
9.
Reset button
10.
8M crystal
11.
32.768K crystal, for internal RTC with calibration
12.
JTAG/SWD interface: for debugging/programming
13.
USB connector, supports Device and/or Host
14.
MCU pins expander, VCC, GND and all the I/O pins are accessible on expansion connectors
for further expansion
15.
5Vin pinheader, 5V power supply is required when using USB HOST/OTG
16.
USB OTG/HOST jumper
⚫
short the jumper when using USB OTG/HOST
⚫
open the jumper to disconnect from related I/O port
17.
VBAT selection jumper
⚫
short the jumper to use system power supply
⚫
open the jumper to connect the VBAT to external power, such as battery
18.
VREF selection jumper
⚫
short the jumper to connect VREF+ to VCC
open the jumper to connect VREF+ to other custom pin via jumper wire