8
EasyARM v6
MikroElektronika
page
3. USB UART1 i USB UART2 modules
USB UART modules enables the
EasyARM v6
development system to be connected to a PC via a USB connector. In
addition to PC, the development system can also be easily connected to other devices that use USB communication.
USB UART modules are connected to the microcontroller supplied on the development system via P0.1(RX) and
P0.0(TX) pins for USB UART1 or P0.9(RX) and P0.8(TX) for USB UART2
.
In order to establish connection between the USB UART1 module and the
microcontroller, it is necessary to set switches 5 and 6 on the DIP switch SW2 to
the ON position. To connect the USB UART2 module and the microcontroller, it is
necessary to set swiches 7 and 8 on the DIP switch SW2 to the ON position.
CN34
CN35
USB B
USB B
D+
D+
GND
GND
VCC
VCC
D-
D-
R18
4K7
R20
4K7
R19
10K
R21
10K
Bottom view
Bottom view
VCC
VCC
GND
GND
D+
D+
D-
D-
VCC-3.3
VCC-3.3
VCC-5V
VCC-5V
OSCI
DTR#
OSCO
TXD
TEST
VCC
RTS#
DSR#
AGND
RESET#
VCCIO
DCD#
NC
GND
RXD
CTS#
CBUS1
USBDM
GND
CBUS2
GND
USBDP
NC
CBUS3
CBUS1
3V3OUT
RI#
CBUS4
FT232RL
U3
OSCI
DTR#
OSCO
TXD
TEST
VCC
RTS#
DSR#
AGND
RESET#
VCCIO
DCD#
NC
GND
RXD
CTS#
CBUS1
USBDM
GND
CBUS2
GND
USBDP
NC
CBUS3
CBUS1
3V3OUT
RI#
CBUS4
FT232RL
U4
VCC-5V
C4
100nF
VCC-5V
C7
100nF
VCC-3.3
C5
100nF
VCC-3.3
C8
100nF
C3
C6
100nF
100nF
VCC-5V
E5
10uF
VCC-5V
E6
10uF
RX-FTDI1
RX-FTDI2
TX-FTDI1
TX-FTDI2
P0.1
P0.0
P0.9
P0.8
SW2
LPC2148
P1.27
P0.31
GND
P0.
0
P1.31
P0.
1
P0.
2
VCC3
P1.26
GND
P0.
3
P0.
4
P1.25
P0.
5
P0.
6
P0.
7
P1.24
VREF
XT
AL1
XT
AL2
P1.28
GNDA
P0.23
RESET
P1.29
P0.20
P0.19
P0.18
P1.30
VCC3
GND
VBA
T
P0.21
P1.20
P0.17
P0.16
P0.15
P1.21
VCC3
GND
P0.14
P1.22
P0.13
P0.12
P0.11
P1.23
P0.10
P0.9
P0.8
P0.22
RTXC1
P1.19
RTXC2
GND
VCCA
P1.18
P0.25
D+
D-
P1.17
P0.28
P0.29
P0.30
P1.16
VCC3
Figure 3-2
: USB UART module connection schematic
Figure 3-1
: USB UART modules
