User Manual

Open429I-C User Manual
Version: V1.3.3, Date: 2019.04.02 7 / 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