User guide

Evaluation Kit Hardware
Evaluation Kit (EK) User Guide 4-27
11115A–ATARM–27-Jul-11
4.3.3.4 DBGU
The UART is connected to the DB-9 male socket through an RS-232 Transceiver (TXD and RXD only).
A jumper, JP11, is used to select DBGU or CAN0 between IO (PA9, PA10) sharing scheme. Close JP11
to select DBGU.
Figure 4-21. DBGU Com Port
SEL_CAN
JP11
SIP2
1 2
R67 0R
PA9
C33 100n
VDDIOP0
C31
100n
J11
5
4
3
2
1
9
8
7
6
10 11
C1+
V+
VCC
C1-
C2+
C2- V-
T1
T2
R1
R2
GND
EN
SD
MN8
ADM3222ARW
2 17
4
5
6
16
12
11
13
10 9
14
8
15
3
7
1 18
C30
100n
R59
100k
R73 100k
VDDIOP0
C36
100n
EARTH_RS232
R72 0R
C38 100n
PWR_EN
VDDIOP0
DTXD
PA10
R60
100k
DRXD
R71 0R