AppBox D21 System User’s Guide 15
AppBox
3.1.3 J3, USB Connector
The following table shows the signals present on the J3 connector. The J3 connector is a female USB
connector.
3.1.4 J6, Cortex-M Debug Connector
The following table shows the signals present on the J6 connector.
J6, Cortex-M Debug Connector
Pin number
Signal name
1
VDD_3V3, +3.3 volts
2
PA31_SWDIO
3
DGND
4 PA30_SWCLK
5
DGND
6 No
Connect
7
No Connect
8 No
Connect
9
DGND
10 RESETn
J3, USB Connector
Pin number
Signal name
1
VBUS / Pin 5, U6
2
D- / PA24_USB_DM, Pin 1, U6, IO1
3
D+ / PA25_USB_DP, Pin 3, U6, IO2
4
ID / Pin 4, U6, IO3
5
DGND
6
SHIELD1 / DGND via cap
7
SHIELD2 / DGND via cap
8
SHIELD3 / DGND via cap
9
SHIELD4 / DGND via cap
10
SHIELD5 / DGND via cap
11
SHIELD6 / DGND via cap
