Usb Uart B - Mikroe EasyMx PRO v7a Manual

USB-UART B
If you need to use more than one USB-UART in your application, you have another
USB-UART B connector available on the board too. Both available USB-UART modules
can operate at the same time, because they are routed to separate microcontroller
pins.
USB-UART B communication is being done through a FT232RL controller, USB
connector (CN23), and microcontroller UART module. To establish this connection,
you must connect RX and TX lines of the microcontroller to the appropriate input
and output pins of the FT232RL. This selection is done using DIP switches SW12.3
and SW12.4.
When using either USB-UART A or USB-UART B, make sure to disconnect all devices
and additional boards that could interfere with the signals and possibly corrupt the
sent or received data.
VCC-3.3V
U4
1
TXD OSCO
2
DTR# OSCI
PD5 TX-FTDI2 3
RTS# TEST
PD6 RX-FTDI2 4
VCCIO AGND
5
RXD NC
6
RI# CBUS0
7
GND CBUS1
FT232RL
8
NC GND
9
DSR# VCC
SW12 10
DCD#
RESET#
11
CTS# GND
12
CBUS4 3V3OUT
13
CBUS2 USBDM
14
CBUS3 USBDP
FT232RL
E a s y M x P R O v 7 a U s e r M a n u a l
VCC-5V VCC-3.3V VCC-3.3V
R29 R30
2K2 4K7
28
27
RX TX
26
25
24
LD73 LD74
23 RX-LED2
D-
22 TX-LED2 R37
D+
4K7
21
20
R87 R86
19
18
5.1k 5.1k
17
R88 27
16 FTDI2-D_N
FTDI2-D_P
15
R89 27
C26
100nF R38
10K
D9
D+ 1 6 D+
I/O1 I/O1
GND 2 5 USB-VBUS
GND VBUS
D- 3 4 D-
I/O2 I/O2
USBLC6-2P6
Enabling USB-UART B
USB-VBUS
B1A12
GND
B4A9
VBUS
B8
SBU2
B7
DN2
B6
DP2
B5
CC2
A8
SBU1
A7
DN1
A6
DP1
A5
CC1
A1B12
In order to enable USB-UART B
GND
A4B9
VBUS
communication, you must push
CN23
USB TYPE-C
SW12.3 (PD5) and SW12.4 (PD6)
to ON position. This connects the
TX and RX lines to PD5 and PD6
microcontroller pins and its UART
module.