User`s guide
page 24
USB HOST
communication
USB is the acronym for Universal Serial
Bus. This is a very popular industry
standard that denes cables, connectors
and protocols used for communication
and power supply between computers
and other devices. EasyMx PRO
™
v7
contains USB HOST connector (CN11)
for USB Standard Type A plug, which
enables microcontrollers that support
USB communication to establish a
connection with the target device (eg.
USB Keyboard, USB Mouse, etc). USB host
also provides the necessary 5V power
supply to the target. Maximum power
which can be drawn depends on the
power consumption of the EasyMx PRO™
board itself. Microcontroller USB data
lines are directly connected to MCU card
socket pins.
Powering USB device
Through microcontroller's PH3 pin
you can enable or disable power
supply to USB device connected
to HOST. In order to connect power
transistor to microcontroller, you
must push SW10.7 to ON position.
EasyMx PRO
v7
USB HOST
CONNECTOR
M1
ZXMP7A17K
VCC-5V
C28
100nF
R38
1K
R37
1K
VCC-5V
Q1
BC846
1
2
3
4
VCC
GND
D-
D+
CN11
USB A
E10
10uF
E11
10uF
USB-D_N
USB-D_P
R42
1K
R41
4K7
VCC-3.3V
USB-PSW
1 2 3 4 5
6
7 8
O
N
SW10
PH3
DATA BUS
1
3
5
7
9
11
13
15
17
19
21
23
25
2
4
6
8
10
12
14
16
18
20
22
24
26
27
29
31
33
35
37
39
41
43
45
47
49
51
28
30
32
34
36
38
40
42
44
46
48
50
52
MCU CARD SOCKET
USB-D_P
PH3
USB-D_N
communication
Figure 10-2:
powering
USB device
through
PSW line
Figure 10-1: USB
host connection
schematics